Patent Publication Number: US-2023151953-A1

Title: Control Module for a Lighting Fixture

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Patent Application No. 63/270,896, filed Oct. 22, 2021, and U.S. Provisional Patent Application No. 63/341,687, filed May 13, 2022, the entire disclosures of which are hereby incorporated by reference. 
    
    
     BACKGROUND 
     A user environment, such as a residence or an office building for example, may be configured using various types of load control systems. A lighting control system may be used to control the lighting loads in the user environment. A motorized window treatment control system may be used to control the natural light provided to the user environment. A heating, ventilation, and air-conditioning (HVAC) system may be used to control the temperature in the user environment. 
     Each load control system may include various control devices, including input devices and load control devices. The load control devices may receive digital messages, which may include load control instructions, for controlling an electrical load from one or more of the input devices. The load control devices may receive the digital messages via radio frequency (RF) signals. Each of the load control devices may be capable of directly controlling an electrical load. The input devices may be capable of indirectly controlling the electrical load via digital messages transmitted to the load control device. 
     SUMMARY 
     As described herein, a control module configured to be mounted in a fixture opening of a housing of a lighting fixture may comprise an antenna (e.g., a dipole antenna) having a majority of primary radiating structures located outside of the lighting fixture when mounted to the lighting fixture. The control module may comprise an enclosure defining a central axis extending in a longitudinal direction and configured to be received in the fixture opening of the lighting fixture, and a cover portion connected to the enclosure and covering an enclosure opening at a first end of the enclosure. The control module may also comprise at least one printed circuit board housed within the enclosure and having a control circuit and a wireless communication circuit mounted thereto, and a detector positioned to receive infrared energy through a lens in an aperture of the cover portion. The detector may be electrically coupled to the control circuit such that the control circuit is configured to detect at least one of an occupancy or vacancy condition in a space surrounding the control module. The antenna of the control module may comprise first and second antenna elements electrically connected to the wireless communication circuit in a dipole antenna configuration. Each of the first and second antenna elements may extend from the at least one printed circuit board to respective curved portions that are positioned between the cover portion and the enclosure and curve around the detector. The control circuit may be configured to cause the wireless communication circuit to communicate messages in wireless signals via the antenna. 
     The detector may comprise one or more pyroelectric elements that are responsive to the infrared energy and a housing having a front surface with a first opening through which the pyroelectric elements receive the infrared energy. The detector may be located at a point where energy of the wireless signals transmitted by the antenna is at a maximum level. The housing of the detector may be electrically conductive and may be coupled to a circuit common of the control module. The opening of the housing of the detector may be sized to shield the pyroelectric elements from wireless signals transmitted by the antenna in response to the wireless communication circuit. In addition, the detector may comprise a shield located over the front surface of the housing of the detector. The shield may have an opening arranged overtop of the opening of the housing and may be electrically coupled to circuit common of the control module. When the housing of the detector is electrically conductive and coupled to circuit common of the control module, the shield may be electrically connected to the housing of the detector and circuit common. When the housing of the detector is not electrically conductive, the shield may comprise a conductive strap configured to be coupled to circuit common of the control module. The opening of the shield being sized to shield the pyroelectric elements from the wireless signals transmitted by the antenna in response to the wireless communication circuit. 
     In addition, the enclosure may comprise first and second clips configured to mount the control module within the fixture opening. The first and second clips may be located adjacent to each other. Each of the first and second clips may comprise a plurality of teeth configured to engage a structure surrounding the fixture opening. The teeth of the first and second clips may be staggered relative to each other, such that one tooth of the first clip or the second clip is configured to engage the fixture opening at a single time. As the control module is inserted into the fixture opening, a first tooth of the first clip may be configured to engage the structure surrounding the fixture opening first, a second tooth of the second clip may be configured to engage the structure surrounding the fixture opening after the first tooth, a third tooth of the first clip may be configured to engage the structure surrounding the fixture opening after the second tooth, and a fourth tooth of the second clip may be configured to engage the structure surrounding the fixture opening after the third tooth. The first clip may comprise a first number of teeth and the second clip may comprise a second number of teeth, such that the control module is configured to be installed in the fixture opening at a third number of distinct depths of insertion, where the third number is equal to the first number plus the second number. 
     Further, the at least one printed circuit board of the control module may comprise one or more attachment tabs extending from sides of the at least one printed circuit board. The one or more attachment tabs may be configured to attach the at least one printed circuit board to a fabrication panel during manufacturing of the control module. After the at least one printed circuit board is detached from the fabrication panel, the one or more attachment tabs are configured to be received within gaps in the enclosure of the control module to align the at least one printed circuit board within the enclosure. In some examples, the detector and/or the antenna and wireless communication circuit may be omitted from the control module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram of an example load control system. 
         FIGS.  2  and  3    are perspective views depicting an example control module (e.g., sensor module) that may be installed in a lighting fixture of the load control system of  FIG.  1   . 
         FIG.  4    is a radial side view of the control module of  FIG.  2    (e.g., looking in a radial direction). 
         FIG.  5    is a transverse side view of the control module of  FIG.  2    (e.g., looking in a transverse direction). 
         FIGS.  6  and  7    are exploded views of the control module of  FIG.  2   . 
         FIG.  8    is a side cross-sectional view of the control module of  FIG.  2    taken through the center of the control module. 
         FIGS.  9  and  10    are side cross-sectional views of the control module of  FIG.  2    taken through two different printed circuit boards of the control module. 
         FIGS.  11  and  12    are perspective views of the control module of  FIG.  2    partially assembled. 
         FIG.  13    is a perspective view of a detector that may be used in the control module of  FIG.  2   . 
         FIGS.  14  and  15    are perspective view of a detector with a shield that may be used in the control module of  FIG.  2   . 
         FIGS.  16 A and  16 B  are block diagrams of an example load control system in first and second configurations, respectively. 
     
    
    
     DETAILED DESCRIPTION 
       FIG.  1    is a diagram of an example load control system  100  for controlling the amount of power delivered from an alternating-current (AC) power source (not shown) to one or more electrical loads. The load control system  100  may be installed in a load control environment, such as a room  102  of a building. The load control system  100  may comprise a plurality of control devices configured to communicate with each other via wireless signals, e.g., radio-frequency (RF) signals  104 ,  105 . For example, the control-source devices, control-target devices, and/or the system controller  110  may be configured to transmit and receive the RF signals  104 ,  105 . The RF signals  104 ,  105  may use a proprietary RF protocol, such as the CLEAR CONNECT protocol (e.g., the CLEAR CONNECT TYPE A protocol and/or the CLEAR CONNECT TYPE X protocol). Alternatively, the RF signals  104 ,  105  may be transmitted using a different RF protocol, such as, a standard protocol, for example, one of WI-FI, BLUETOOTH, BLUETOOTH LOW ENERGY (BLE), ZIGBEE, Z-WAVE, THREAD, KNX-RF, ENOCEAN RADIO protocols, or a different standard or proprietary protocol. Alternatively or additionally, the load control system  100  may comprise a wired digital communication link coupled to one or more of the control devices to provide for communication between the control devices. 
     The control devices of the load control system  100  may comprise a number of control-source devices (e.g., input devices operable to transmit messages in response to receiving user inputs, detecting occupancy/vacancy conditions, measuring ambient light intensity level, etc.) and a number of control-target devices (e.g., load control devices operable to receive messages and control electrical loads in response to the received messages). A single control device of the load control system  100  may operate as both a control-source and a control-target device. For example, the control-source device may be an originating device or intermediary device from which a message is originated and a control-target device may be a destination device or intermediary device to which the message is transmitted. 
     The lighting control system  100  may comprise one or more lighting fixtures  110   a ,  110   b ,  110   c ,  110   d  that may be installed in the room  102  (e.g., in the ceiling of the room). Each lighting fixture  110   a - 110   d  may include a lighting load (e.g., an LED light source) and a respective lighting control device (e.g., an LED driver, ballast, dimming or switching module, or any combination of such devices) for controlling the respective lighting load of the lighting fixture  110   a - 110   d . The lighting control devices may be control-target devices capable of controlling a respective lighting load in response to control instructions received in digital messages. 
     The control-source devices of the load control system  100  may be used to control the lighting fixtures  110   a - 110   d . The control-source devices may be input devices capable of communicating messages (e.g., digital messages) to the control-target devices of the load control system  100 , such as the lighting control devices in the lighting fixtures  110   a - 110   d , e.g., via the RF signals  104 ,  105 . The control-source devices may transmit the messages for controlling (e.g., indirectly controlling) the amount of power provided to the lighting loads by the respective lighting control devices in the respective lighting fixtures  110   a - 110   d . The messages may include control instructions (e.g., load control instructions) or another indication that causes the lighting control devices to determine load control instructions for controlling the respective lighting loads. The control-sources devices of the load control system  100  may comprise, for example, a remote control device  130 , which may be configured to transmit messages to the lighting control devices in the respective lighting fixture  110   a - 110   d  via the RF signals  104  in response to actuations of one or more buttons of the remote control device  130 . For example, the remote control device  130  may be battery-powered. 
     The load control system  100  may include control modules (e.g., sensor devices and/or fixture controllers), such as control modules  120   a ,  120   b ,  120   c ,  120   d . The control modules  120   a - 120   d  may each be attached to one of the lighting fixture  110   a - 110   d . The control modules  120   a - 120   d  may each be electrically connected to a respective lighting control device within the lighting fixtures  110   a - 110   d  for controlling lighting loads. The control modules  120   a - 120   d  may include one or more sensors (e.g., sensing circuits) for controlling the lighting loads within the respective lighting fixtures  110   a - 110   d . For example, the control modules  120   a - 120   d  may include an occupancy sensing circuit (e.g., may operate as an occupancy sensor) and/or a daylight sensing circuit (e.g., may operates as a daylight sensor). The control modules  120   a - 120   d  may be control-source devices that transmit digital messages to respective lighting control devices to which they are connected (e.g., on a wired communication link). The control modules  120   a - 120   d  may also, or alternatively, be control-target devices for receiving digital messages from other devices in the system, such as the remote control device  130  or another control-source device, (e.g., on a wireless communication link via the RF signals  104 ,  105 ) for controlling the respective lighting control devices to which the control modules  120   a - 120   d  are connected. 
     The occupancy sensing circuit in the control modules  120   a - 120   d  may be configured to detect occupancy and/or vacancy conditions in the room  102  in which the load control system  100  is installed. The control modules  120   a - 120   d  may control the lighting control devices in the respective lighting fixtures  110   a - 110   d  in response to the occupancy sensors detecting the occupancy or vacancy conditions. The control modules  120   a - 120   d  may each also operate as a vacancy sensor, such that messages are transmitted in response to detecting a vacancy condition (e.g., messages may not be transmitted in response to detecting an occupancy condition). The daylight sensing circuit in the control modules  120   a - 120   d  may be configured to measure an ambient light intensity level in the visible area of the room  102  in which the load control system  100  is installed. The control modules  120   a - 120   d  may control the lighting control devices in the respective lighting fixture  110   a - 121   d  in response to the ambient light intensity level measured by the respective daylight sensing circuit. 
     The control modules  120   a - 120   d  may each comprise a memory or other computer-readable storage medium capable of storing instructions thereon for being executed by the control circuit. Each control module  120   a - 120   d  may store in the memory unique identifiers of other devices in the load control system  100  with which the control module is associated to enable recognition of messages from and/or transmission of messages to associated control devices. For example, each control module  120   a - 120   d  may store in the memory the unique identifier of the remote control device  130  with which the control module is associated. 
     The control modules  120   a - 120   d  may each comprise one or more wireless communication circuits for transmitting and/or receiving messages, e.g., via the RF signals  104 ,  105 . A first wireless communication circuit of each of the control modules  120   a - 120   d  may be capable of communicating on a first wireless communication link (e.g., a wireless network communication link) and/or communicating using a first wireless protocol (e.g., a wireless network communication protocol, such as the CLEAR CONNECT and/or THREAD protocols) via the RF signals  104 . A second wireless communication circuit of each of the control modules  120   a - 120   d  may be capable of communicating on a second wireless communication link (e.g., a short-range wireless communication link) and/or communicating using a second wireless protocol (e.g., a short-range wireless communication protocol, such as the BLUETOOTH and/or BLUETOOTH LOW ENERGY (BLE) protocols) via the RF signals  105 . 
     The control modules  120   a - 120   d  may each comprise one or more wired communication circuits for transmitting and/or receiving signals and/or messages via respective wired communication links. For example, each control module  120   a - 120   d  may transmit and/or receive messages via the wired communication circuit on a wired power/communication link in the respective lighting fixture  110   a - 110   d . The wired power/communication link may be used for providing communications and/or power within each of the lighting fixtures  110   a - 110   d . For example, the wired power/communication link may comprise, for example, a Digital Addressable Lighting Interface (DALI) link or another digital communication link. The wired power/communication link in each lighting fixture  110   a - 110   d  may be used by the respective control module  120   a - 120   d  to transmit messages (e.g., including commands) to the respective lighting control devices for controlling an intensity level and/or color (e.g., color temperature) of the respective lighting loads. Each control module  120   a - 120   d  may receive messages (e.g., including feedback information) from the respective lighting control device that indicate the intensity level and/or color of the respective lighting loads. In addition, the lighting control devices in each of the lighting fixtures  110   a - 110   d  may each receive power from an AC power source (not shown) and may each supply power to the respective control module  120   a - 120   d  via the wired power/communication link  120 . Though the wired power/communication link may be described herein as a single link, the wired power/communication link may be comprised of multiple links. For example, the lighting control devices of each lighting fixture  110   a - 110   d  may provide power to the respective control module  120   a - 120   d  via a two-wire power bus, while communications may be performed between the control module and the lighting control devices  124  using an analog communication link, such as a 0-10V control link or another communication link through which power may not be provided (e.g., an RS-485 digital communication link). 
     The load control system  100  may include a system controller  140  that is configured to transmit and/or receive messages via wired and/or wireless communications. For example, the system controller  140  may be configured to transmit and/or receive the RF signals  104 , to communicate with one or more control devices (e.g., control-source devices and/or control-target devices, such as the control modules  120   a - 120   d ). The system controller  140  may communicate digital messages between associated control devices. The system controller  140  may be coupled to one or more wired control devices (e.g., control-source devices and/or control-target devices) via a wired digital communication link. The system controller  140  may also, or alternatively, be capable of communicating on a third wireless communication link (e.g., a standard communication link) and/or communicating using a third wireless protocol (e.g., a standard communication protocol, such as the Internet protocol (IP) and/or WI-FI protocol), via RF signals  106 . For example, the system controller  140  may be configured to transmit and/or received messages on a network  108 , such as the Internet, via the RF signals  106 . 
     The system controller  140  may be configured to transmit and receive messages between control devices. For example, the system controller  140  may transmit messages to the control modules  120   a - 120   d  for controlling the lighting loads in the lighting fixtures  110   a - 110   d  in response to the messages received from the remote control device  130  (e.g., via the RF signals  104 ). The messages may include configuration data for configuring the control devices (e.g., the control modules  120   a - 120   d ) and/or control data (e.g., commands) for controlling the lighting loads in the lighting fixtures  110   a - 110   d.    
     The load control system  100  may be commissioned to enable control of the lighting loads in the lighting fixtures  110   a - 110   d  based on commands communicated from the control devices (e.g., the remote control device  130 ) to the control modules  120   a - 120   d  for controlling the lighting loads in the lighting fixtures  110   a - 110   d . For example, the remote control device  130  may be associated with the control modules  120   a - 120   d  within the lighting fixtures  110   a - 110   d . Association information may be stored on the associated devices, which may be used to communicate and identify messages and/or commands at associated devices for controlling electrical devices in the load control system  100 . The association information may include the unique identifier of one or more of the associated devices. The association information may be stored at the control modules  120   a - 120   d , the system controller  140 , or at other control devices that may be implemented to enable communication and/or identification of messages between the control devices. 
     A network device  150  may be in communication with the control modules  110   a - 110   d  and/or the system controller  140  for commissioning and/or controlling the control devices of the load control system  100 . The network device  150  may comprise a wireless phone, a tablet, a laptop, a personal digital assistant (PDA), a wearable device (e.g., a watch, glasses, etc.), or other computing device. The network device  150  may be operated by a user  152 . The network device  150  may be configured to communicate with the system controller  140  and/or control devices connected to the network  108  by transmitting and/or receiving messages using a standard wireless protocol (e.g., via the RF signals  108 ). In addition, the network device  150  may be configured to communicate with the control modules  110   a - 110   d  by transmitting and/or receiving messages via the short-range wireless communication link (e.g., using the RF signals  106 ). Further, the network device  150  may be configured to transmit and/or receive beacon signals that may be used to commission the load control system  100  via the short-range wireless communication link (e.g., using the RF signals  106 ). 
       FIGS.  2  and  3    are perspective views depicting an example control module  200  (e.g., a sensor module), which may be deployed as the control modules  120   a - 120   d  for the load control system  100  shown in  FIG.  1   .  FIG.  2    also shows a partial view an example lighting fixture  202  (e.g., a corner  203  of the lighting fixture  202 ) into which the control module  200  may be installed (e.g., attached and/or mounted).  FIG.  4    is a radial side view of the control module  200  (e.g., looking in a radial direction R) and  FIG.  5    is a transverse side view of the control module  200  (e.g., looking in a transverse direction T, i.e., 90° from the view of  FIG.  4   ).  FIGS.  6  and  7    are exploded views of the control module  200 .  FIG.  8    is a side cross-sectional view of the control module  200  taken through the center of the control module  200  (e.g., through the line shown in  FIG.  4   ). The control module  200  may be configured to be attached (e.g., mounted) to the lighting fixture  202  (e.g., one of the lighting fixtures  110   a - 110   d ) and electrically connected to different types of lighting control devices, such as different types of LED drivers, for example. The control module  200  may be electrically connected to the lighting control device(s) (e.g., via a wired communication link and/or control link) to enable control of the lighting control device(s) in response to information provided from the control module  200 . 
     The control module  200  may comprise an enclosure  210  having a first enclosure portion  212   a  and a second enclosure portion  212   b . The enclosure  210  of the control module  200  may be configured to be received in a fixture opening  204  (e.g., a circular fixture opening) of a housing  205  of the lighting fixture  202 . The fixture opening  204  may extend from an outer surface  206  (e.g., a bottom surface) to an inner surface  208  of the housing  205  of the lighting fixture  202 , such that the housing  205  (e.g., the material of the housing) is characterized by a thickness T (e.g., as shown in  FIG.  2   ). For example, the fixture opening  204  may have a diameter of approximately 0.86-0.95 inches. The first and second enclosure portions  212   a ,  212   b  of the enclosure  210  may each comprise respective side walls  214   a ,  214   b  shaped to allow the enclosure  210  to be received in the fixture opening  204 . For example, the enclosure  210  may extend in a longitudinal direction L and may have a cylindrical shape that may be centered about a central axis  211  of the control module  200  (e.g., that also extends in the longitudinal direction L). For example, the longitudinal direction L may be defined by the central axis  211 . The first and second enclosure portions  212   a ,  212   b  may be attached to each other, for example, to define the cylindrical shape of the enclosure  210 . When the first and second enclosure portions  212   a ,  212   b  are attached to each other, the enclosure  210  may define an opening  213  in a bottom side  215  of the enclosure  210 , as shown in  FIG.  8   . The first and second enclosure portions  212   a ,  212   b  of the enclosure  210  may comprise respective flange portions  216   a ,  216   b  that surround the bottom side  215  of the enclosure  210  at the ends of the side walls  214   a ,  214   b  (e.g., that surround the opening  213  of the enclosure  210 ). The flange portions  216   a ,  216   b  may extend radially from the opening  213 . The first enclosure portion  212   a  may comprise snaps  217  configured to engage (e.g., be attached to) ledges  218  in recesses  219  in the second enclosure portion  212   a  to affix the first and second enclosure portions  212   a ,  212   b  together, as shown in  FIGS.  6  and  7   . 
     The control module  200  may comprise a cover portion  220  (e.g., a bezel) configured to cover the opening  213  in the enclosure  210  and/or the fixture opening  204  in the lighting fixture  202  to which the control module  200  is mounted. The control module  200  may further comprise a lens  222  received in an aperture  221  in a front surface  223  of the cover portion  220 . The aperture  221  and the lens  222  may be centered about the central axis  211  of the control module  200 . When the fixture opening  204  is located in a bottom surface of the lighting fixture  202 , the cover portion  220  and the lens  222  may be directed downward (e.g., towards the floor). When the control module  200  is installed (e.g., fully inserted) in the fixture opening  204 , a rear edge  224  (e.g., a rear surface) of the cover portion  220  may contact the outer surface  204  of the lighting fixture  204 . The lens  222  may be dome-shaped and made of at least a partially infrared or visible light transparent material to allow infrared energy to enter the enclosure  210  through the aperture  221 . The cover portion  220  may comprise tabs  225  (e.g., as shown in  FIG.  8   ) configured to contact the flange portions  216   a ,  216   b  of the first and second enclosure portions  212   a ,  212   b  to attach the cover portion  220  to the enclosure  210 . 
     The lens  222  may be configured to rest in (e.g., be received by) a support structure  226  of the cover portion  220 . The cover portion  220  may comprise a rib  227  extending around an inner surface  228  of the lens  222 . The rib  227  may be configured to engage complementary features in the cover portion  220 . When the lens  222  is inserted into the aperture  221  in the front surface  223  of the cover portion  220 , the rib  227  may be held underneath an inner edge  229  of the support structure  226  to retain the lens  222  in the aperture  221 . For example, the support structure  226  may define a recess  231  that is configured to receive the rib  227  such that the lens  222  is releasably secured to the cover portion  220 . The lens  222  may also comprise projections  233  that may be received around a corresponding structure (not shown) of the cover portion  220  when the lens  222  is received within the aperture  221 . 
     The control module  200  may comprise an occupancy detection circuit having a detector  270 . For example, the occupancy detection circuit may comprise a passive infrared (PIR) sensing circuit, and the detector  270  may comprise a pyroelectric detector. The detector  270  may be configured to detect infrared energy from an occupant in a load control environment (e.g., such as the room  102  shown in  FIG.  1   ) that may enter the control module  200  through the aperture  221  of the cover portion  220  (e.g., through the lens  222 ). The control module  200  may be configured to detect motion in the load control environment (e.g., occupancy and/or vacancy conditions) in response to the infrared energy detected by the detector  270 . When the fixture opening  204  is located in a bottom surface of the lighting fixture  202 , the control module  200  may be configured to detect occupancy and/or vacancy conditions in the space (e.g., the load control environment) beneath the lighting fixture  202  to which the control module  200  is attached. 
     The first and second enclosure portions  212   a ,  212   b  may each comprise one or more clips (e.g., first clips  230   a ,  230   b  and/or second clips  240   a ,  240   b ) for mounting the control module  200  to the lighting fixture  202  (e.g., within the fixture opening  204 ). For example, the first enclosure portion  212   a  may comprise a first clip  230   a  and a second clip  240   a . The first and second clips  230   a ,  240   a  of the first enclosure portion  212   a  may each comprise a respective arm  232   a ,  242   a . The first and second clip  230   a ,  240   a  of the first enclosure portion  212   a  may each comprise a plurality of teeth located at an end  234   a ,  244   a  of the respective arm  232   a ,  242   a . For example, the first clip  230   a  of the first enclosure portion  212   a  may comprise a first tooth  235   a  and a second tooth  236   a . The first tooth  235   a  may define an engagement surface  237   a  and the second tooth  236   a  may define an engagement surface  238   a . The second clip  240   a  of the first enclosure portion  212   a  may comprise a first tooth  245   a  and a second tooth  246   a . The first tooth  245   a  may define an engagement surface  247   a  and the second tooth  246   a  may define an engagement surface  248   a . The first teeth  235   a ,  245   a  and the second teeth  236   a ,  246   a  of the first and second clips  230   a ,  240   a  of the first enclosure portion  212   a  may be located at different locations along the length of each of the first and second clips  230   a ,  240   a  (e.g., the first and second clips  230   a ,  240   a  are not identical). For example, the first tooth  235   a  and the second tooth  236   a  of the first clip  230   a  may be displaced along the first clip  230   a  in a first layout, and the first tooth  245   a  and the second tooth  246   a  of the second clip  240   a  may be displaced along the second clip  240   a  in a second layout. While each clip  230   a ,  240   a  may comprise two teeth as shown in  FIGS.  2 - 12   , each of the clips may comprise more or less teeth, and the first and second clips  230   a ,  240   a  may comprise different numbers of teeth. 
     The second enclosure portion  212   b  may comprise a first clip  230   b  and a second clip  240   b . The first and second clips  230   b ,  240   b  of the second enclosure portion  212   b  may each comprise a respective arm  232   b ,  242   b . The first and second clip  230   b ,  240   b  of the second enclosure portion  212   b  may each comprise a plurality of teeth located at an end  234   b ,  244   b  of the respective arm  232   b ,  242   b . For example, the first clip  230   b  of the second enclosure portion  212   b  may comprise a first tooth  235   b  and a second tooth  236   b . The first tooth  235   b  may define an engagement surface  237   b  and the second tooth  236   b  may define an engagement surface  238   b . The second clip  240   b  of the second enclosure portion  212   b  may comprise a first tooth  245   b  and a second tooth  246   b . The first tooth  245   b  may define an engagement surface  247   b  and the second tooth  246   b  may define an engagement surface  248   b . The first teeth  235   b ,  245   b  and the second teeth  236   b ,  246   b  of the first and second clips  230   b ,  240   b  of the second enclosure portion  212   b  may be located at different locations relative to each other along the length of each clip  230   b ,  240   b  (e.g., the first and second clips  230   b ,  240   b  are not identical). For example, the first tooth  235   b  the second tooth  236   b  of the first clip  230   b  may be displaced along the first clip  230   b  in the first layout, and the first tooth  245   b  the second tooth  246   b  of the second clip  240   b  may be displaced along the second clip  240   b  in the second layout. The first clip  230   a  of the first enclosure portion  212   a  and the first clip  230   b  of the second enclosure portion  212   b  may be identical (e.g., having the first layout of teeth), and the second clip  240   a  of the first enclosure portion  212   a  and the second clip  240   b  of the second enclosure portion  212   b  may be identical (e.g., having the second layout of teeth). While the control module  200  is described herein with the first and second enclosure portions  212   a ,  212   b  each having one of the first clips  230   a ,  230   b  and one of the second clips  240   a ,  240   b , one of the first and second enclosure portions  212   a ,  212   b  could have two of the first clips (e.g., both having the first layout of teeth) and the other of the first and second enclosure portions  212   a ,  212   b  could have two of the second clips (e.g., both having the second layout of teeth). 
     The first and second clips  230   a ,  240   a  of the first enclosure portion  212   a  and the first and second clips  230   b ,  240   b  of the second enclosure portion  212   b  may be received by the fixture opening  204  for mounting the control module  200  to the lighting fixture  202 . One or more of the teeth  235   a ,  236   a ,  245   a ,  246   a  of the first enclosure portion  212   a  and one or more of the teeth  235   b ,  236   b ,  245   b ,  246   b  of the second enclosure portion  212   b  may be configured to engage the fixture opening  204  for mounting (e.g., locking) the control module  200  within the fixture opening  204  of the lighting fixture  202 . One or more of the teeth  235   a ,  235   b ,  236   a ,  236   b ,  245   a ,  245   b ,  246   a ,  246   b  may secure the control module  200  within the fixture opening  204 , such that the rear edge  224  of the cover portion  220  contacts the bottom surface  204  of the lighting fixture  202 . The clips  230   a ,  230   b ,  240   a ,  240   b  may be resiliently biasable, for example, towards the central axis  211 . As the control module  210  is inserted into the fixture opening  204  (e.g., along an insertion direction  209  shown in  FIG.  2   ), the arms  232   a ,  232   b ,  242   a ,  242   b  of the respective clips  230   a ,  230   b ,  240   a ,  240   b  may be configured to bend in towards the sidewalls  214   a ,  214   b  of the first and second enclosure portions  212   a ,  212   b  such that the teeth  235   a ,  235   b ,  236   a ,  236   b ,  245   a ,  245   b ,  246   a ,  246   b  are biased toward the sidewalls  214   a ,  214   b . The surface surrounding the fixture opening  204  may press the clips  230   a ,  230   b ,  240   a ,  240   b  toward the sidewalls  214   a ,  214   b  such that the clips  230   a ,  230   b ,  240   a ,  240   b  fit within the fixture opening  204 , as the control module  200  is inserted into the fixture opening  204 . The control module  200  may be secured in position within the fixture opening  204  when one or more of the engagement surfaces  237   a ,  237   b ,  238   a ,  238   b ,  247   a ,  247   b ,  248   a ,  248   b  contacts the inner surface  208  of the material of the housing  205  of the lighting fixture  202 . For example, one or more of the engagement surfaces  237   a ,  237   b ,  238   a ,  238   b ,  247   a ,  247   b ,  248   a ,  248   b  may be configured to prevent the control module  200  from falling out of the fixture opening  204 . 
     When the first and second enclosure portions  212   a ,  212   b  are attached to each other, the first and second clips  230   a ,  230   b ,  240   a ,  240   b  may be arranged in pairs (e.g., adjacent pairs). Each pair of clips may have one clip having the first layout of teeth (e.g., one of the first clips  230   a ,  230   b ) and one clip having the second layout of teeth (e.g., one of the second clips  240   a ,  240   b ). For example, the first clip  230   a  of the first enclosure portion  212   a  and the second clip  240   b  of the second enclosure portion  212   b  may be located adjacent to each other, e.g., as a first pair. Since the first and second clips  230   a ,  240   b  have different layouts of teeth (e.g., the first and second layouts, respectively), the teeth  235   a ,  236   a  of the first clip  230   a  of the first enclosure portion  212   a  and the teeth  245   b ,  246   b  of the second clip  240   b  of the second enclosure portion  212   b  may be located at different locations relative to each other along the length of each clip  230   a ,  240   b . For example, the teeth  235   a ,  236   a  of the first clip  230   a  may be staggered as compared to the teeth  245   b ,  246   b  of the second clip  240   b  (e.g., the teeth of the first and second clips  230   a ,  240   b  may be staggered relative to each other). For example, either one of the teeth  235   a ,  236   a  of the first clip  230   a  or one of the teeth  245   b ,  246   b  of the second clip  240   b  (e.g., one tooth of the pair of clips  230   a ,  240   b ) may engage the fixture opening  204  (e.g., the surface defining the fixture opening  204 ) at a single time. 
     Similarly, the first clip  230   b  of the second enclosure portion  212   b  and the second clip  240   a  of the first enclosure portion  212   a  may be located adjacent to each other, e.g., as a second pair (e.g., as shown in  FIG.  4   ). Since the first and second clips  230   b ,  240   a  have different layouts of teeth (e.g., the first and second layouts, respectively), the teeth  235   b ,  236   b  of the first clip  230   b  of the second enclosure portion  212   b  and the teeth  245   a ,  246   a  of the second clip  240   a  of the first enclosure portion  212   a  may be located at different locations relative to each other along the length of each clip  230   b ,  240   a . For example, the teeth  235   b ,  236   b  of the first clip  230   b  may be staggered as compared to the teeth  245   a ,  246   a  of the second clip  240   a  (e.g., the teeth of the first and second clips  230   b ,  240   a  may be staggered relative to each other). For example, either one of the teeth  235   b ,  236   b  of the first clip  230   b  or one of the teeth  245   a ,  246   a  of the second clip  240   a  (e.g., one tooth of the pair of  230   b ,  240   a ) may engage the fixture opening  204  (e.g., the surface defining the fixture opening  204 ) at a single time. Even though both pairs of clips are located at the junction of the first and second enclosure portions  212   a ,  212   b  as shown in  FIGS.  2 - 8   , the pairs of clips may be located at other locations on each of the first and second enclosure portions  212 ,  212   b , for example, near the center of each of the respective first and second enclosure portions  212 ,  212   b  (e.g., shifted 90 degrees from the positions shown in  FIGS.  2 - 8   ). In addition, while the first and second clips  230   a ,  230   b ,  240   a ,  240   b  are located immediately adjacent to each other when the first enclosure portion  212   a  is connected to the second enclosure portion  212   b , the first and second clips of each pair of clips may also be distanced apart, for example, with up to approximately one-fourth of the circumference of the enclosure  210  between the first and second clips of each pair (e.g., the first and second clips may be spaced apart by approximately 90 degrees). 
     The teeth  235   a ,  235   b ,  236   a ,  236   b ,  245   a ,  245   b ,  246   a ,  246   b  may be configured to allow the control module  210  to be mounted to various lighting fixtures that have housings made of materials of differing thicknesses. The staggering of the teeth between adjacent clips as described above may allow the control module  200  to be installed in the fixture opening  204  at one of a number of different positions, such as four different positions P 1 , P 2 , P 3 , P 4  (e.g., insertion depths) as shown in  FIG.  4   . The four different positions P 1 -P 4  may represent the different thicknesses of the materials of the housings of the various lighting fixtures to which the control module  200  may be mounted. In some examples, a first clip of a pair of clips (e.g., the first clip  230   b  shown in  FIG.  4   ) may comprise a first number X of teeth and a second clip of the pair of clips (e.g., the second clip  240   a  shown in  FIG.  4   ) may comprise a second number Y of teeth, such that the control module  200  may be configured to be installed in the fixture opening  204  at a third number Z of distinct positions (e.g., depths of insertion), where the third number Z may be equal to the first number X plus the second number Y (e.g., Z=X+Y). 
     As shown by the adjacent first and second clips  230   b ,  240   a  (e.g., the second pair of clips) shown in  FIG.  4   , alternating teeth on the first and second clips  230   b ,  240   a  (e.g., and on the first and second clips  230   a ,  240   b ) may engage the fixture opening  204  (e.g., a structure surrounding the fixture opening  204 ) as the control module  200  is inserted into the fixture opening  204  (e.g., along the insertion direction  209  shown in  FIG.  2   ). While the control module  200  is being inserted into the fixture opening  204 , the tooth  235   b  of the first clip  230   b  may contact the structure surrounding the fixture opening  204  first (e.g., before the other teeth) causing the first clip to flex towards the center (e.g., the central axis  211 ) of the control module  210  until the fixture opening  204  moves past a peak of the tooth  235   b . The peak of each of the teeth may define a distal edge of the respective engagement surface. This allows the first clip  230   b  to spring back away from the central axis  211  and the engagement surface  237   b  of the tooth  235   b  to contact the lighting fixture  202 . As the control module  200  is inserted further into the fixture opening  204 , the tooth  245   a  of the second clip  240   a  may contact the lighting fixture  202  causing the second clip to be flex towards the center (e.g., the central axis  211 ) of the control module  210  until the fixture opening  204  moves past a peak of the tooth, which allows the second clip to spring back away from the central axis  211  and the engagement surface  247   a  of the tooth  245   a  to contact the structure surrounding the fixture opening  204 . As the control module  200  is inserted further into the fixture opening  204 , the tooth  236   b  of the first clip  230   b  may contact the lighting fixture  202 , and then the tooth  246   a  of the second clip  240   a  may contact the structure surrounding the fixture opening  204 . Stated differently, the teeth  235   b ,  245   a ,  236   b ,  246   a , may be staggered between the first clip  230   b  and the second clip  240   a , such that the teeth contact and engage the structure surrounding the fixture opening  204  in the following order: the tooth  235   b  of the first clip  230   b , the tooth  245   a  of the second clip  240   a , the tooth  236   b  of the first clip  230   b , and the tooth  246   a  of the second clip  240   a , which allows the control modules to pass through, in order, the position P 1  through position P 4 . In some examples, as the control module  200  is inserted into the fixture opening  204 , a first tooth (e.g., the tooth  235   b  of the flip clip  230   b ) may be configured to engage the fixture opening  204  (e.g., first in order), a second tooth (e.g., the tooth  245   a  of the second clip  240   a ) may be configured to engage the fixture opening  204  after the first tooth (e.g., second in order), a third tooth (e.g., the tooth  236   b  of the first clip  230   b ) may be configured to engage the fixture opening  204  third after the second tooth (e.g., third in order), and a fourth tooth (e.g., the tooth  246   a  of the second clip  240   a ) may be configured to engage the structure surrounding fixture opening  204  after the third tooth (e.g., fourth in order). 
     While the above description of the insertion of the control module  200  into the fixture opening  204  primarily refers to the first clip  230   b  and the second clip  240   a  (e.g., the second pair of clips), a similar sequence of events occurs for the first clip  230   a  and the second clip  240   b  (e.g., the first pair of clips) as the control module  200  is inserted into the fixture opening  204 . In addition, while the above description of the insertion of the control module  200  into the fixture opening  204  describes the control module being inserted into the fixture until the tooth  246   a  of the second clip  240   a  may contact the structure surrounding the fixture opening  204  (e.g., the sensor is in position P 4 ), the insertion of the control module  200  into the fixture opening  204  may stop prior to position P 4 , e.g., when the rear edge  224  of the cover portion  220  contacts the outer surface  206  of the housing  205  of the lighting fixture  202  (e.g., in one of the positions P 1 -P 3 ). 
     The positioning of the teeth  235   a ,  235   b ,  236   a ,  236   b ,  245   a ,  245   b ,  246   a ,  246   b  to stagger the teeth between the first and second clips  230   a ,  230   b ,  240   a ,  240   b  may allow for there to be less teeth per clip (e.g., two teeth per clip) while providing more positions (e.g., four positions) for mounting of the control module  200 . Having less teeth per clip may enable the engagement surfaces  237   a ,  237   b ,  238   a ,  238   b ,  247   a ,  247   b ,  248   a ,  248   b  to be larger so that the control module  200  can more easily be maintained in the positions P 1 -P 4  (e.g., the area of contact between the engagement surface and the lighting fixture  202  is increased as compared to smaller teeth). For example, the first and second clips  230   a ,  230   b ,  240   a ,  240   b  may be designed such that the control module  200  may be easily installed in the fixture opening  204  of the lighting fixture  202 , while being difficult to be removed from the fixture opening  204 . In addition, having the teeth at a wider pitch (e.g., farther away from each other) allows for easier manufacturing (e.g., molding) of the clips (e.g., fine teeth may be more difficult to mold). Providing more positions at which the control module  200  may be mounted to the lighting fixture  202  may allow for a more flexible installation that may account for warping of the housing  205  of the lighting fixture  202  and ensure that the rear edge  224  of the cover portion  220  is flush with the outer surface  206  (e.g., the bottom surface) of the lighting fixture  202  (e.g., which may prevent light from shining through a potential gap between the cover portion  220  and the housing  205  of the lighting fixture  202 ). 
     The control module  200  may comprise a connector  250  that may allow for connection to an external power source (e.g., such as an external direct-current (DC) power source) and/or an external load control device for controlling a lighting load located in the lighting fixture  202  (e.g., such as an LED driver for controlling an LED light source). For example, the connector  250  may comprise two electrical terminals  252  configured to receive wires that may be connected to the power source to allow the control module  200  to receive power for powering the electrical circuitry of the control module  200 . In addition, the connector  250  may comprise two electrical terminals  254  that may receive wires that may be connected to the load control device via a wired communication link and/or a wired control link for controlling the lighting load. 
     As shown in  FIGS.  6  and  7   , the control module  200  may comprise a printed circuit board (PCB) assembly  260 , which may be housed by the enclosure  210  and the cover portion  220 . The printed circuit board assembly  260  may comprise a combination of rigid and flexible printed circuit boards (e.g., a rigid-flex printed circuit board). For example, the printed circuit board assembly  260  may comprise a first printed circuit board  261  (e.g., a sensor printed circuit board), a second printed circuit board  262  (e.g., a power printed circuit board), and a third printed circuit board  263  (e.g., a control printed circuit board). The first, second, and third printed circuit boards  261 ,  262 ,  263  may be electrically connected together via a flexible connector  264  (e.g., a flexible printed circuit board). For example, the first, second, and third printed circuit boards  261 ,  262 ,  263  may comprise multiple layer printed circuit boards (e.g., having three or more layers), where the outer layers are made of a rigid substrate (e.g., FR4) and one of more of the inner layers are made of a flexible printed circuit board material. The flexible connector  264  may be formed as part of one or more of the flexible inner layers of the first, second, and third printed circuit boards  261 ,  262 ,  263 . 
     The detector  270  may be mounted to the first printed circuit board  261 , and the first printed circuit board  261  may be oriented such that the detector  270  is directed towards the lens  222  and the aperture  221  in the cover portion  220  (e.g., directed in the longitudinal direction L). For example, the first printed circuit board  261  may be oriented in a plane that extends in the transverse direction T and the radial direction R. The detector  270  may comprise one or more pyroelectric elements (not shown) that are responsive to the infrared energy received by the detector  270 . The detector  270  may comprise a housing  271  (e.g., a cylindrical housing) that encloses the pyroelectric elements. The housing  271  may have an opening  272  through which the pyroelectric elements may receive the infrared energy. The opening  272  may be located in a front surface  273  of the housing  271  (e.g., which may be oriented in a plane that extends in the transverse and radial directions T, R and is perpendicular to the longitudinal direction L). The housing  271  and/or the opening  272  in the housing  271  may be centered along the central axis  211  of the control module  200 . For example, the opening  272  may be circular as shown in  FIGS.  6  and  7   . In addition, the opening may be rectangularly-shaped, e.g., such as square-shaped (e.g., as shown in  FIG.  13   ). The opening  272  may define an area A DET  that is bounded by a perimeter of the opening  272  (e.g., a circular perimeter as shown in  FIGS.  6  and  7   ). The housing  271  may be made of, for example, a conductive material, such as metal, and/or a non-conductive material, such as plastic. The first printed circuit board  261  may also have a photo-sensing circuit (e.g., a light sensing circuit), such as a photosensor  274 , mounted thereto. The photosensor  274  may be configured to measure an amount of light shining through the lens  222 . 
     The second printed circuit board  262  may extend through the enclosure  210  of the control module  200  in the longitudinal direction L and may be oriented perpendicular to the first printed circuit board  261 . For example, the second printed circuit board  262  may be oriented in a plane that extends in the longitudinal direction L and the transverse direction T. The connector  250  may be mounted to the second printed circuit board  262 . In addition, the second printed circuit board  262  may have a power supply and/or one or more energy storage devices (e.g., capacitors) mounted thereto for generating a DC supply voltage for powering the electrical circuitry of the control module  200 . 
     The third printed circuit board  263  may also extend through the enclosure  210  of the control module  200  in the longitudinal direction L and may be oriented perpendicular to the first printed circuit board  261  and parallel to the second printed circuit board  262 . For example, the third printed circuit board  263  may be oriented in a plane that extends in the longitudinal direction L and the transverse direction T. A control circuit of the control module  200 , such as a processor  275 , may be mounted to the third printed circuit board  263 . The processor  275  may be configured (e.g., software or firmware configured) to detect occupancy and/or vacancy conditions in the load control environment in response to the detector  270 , and may be configured to measure the amount of light shining through the lens  222  in response to the photosensor  274 . The processor  275  may also comprise a wireless communication circuit, such as a radio-frequency (RF) transceiver, and an antenna  280 . The wireless communication circuit may be electrically coupled to the antenna  280  and configured to transmit and receive wireless signals (e.g., RF signals) via the antenna  280  (e.g., which will be described in greater detail below). The antenna  280  may be configured to transmit and/or receive RF signals. Additionally and/or alternatively, the control module  200  may comprise a wireless communication circuit external to the processor  275  and mounted to the third printed circuit board  263 , for example. The wireless communication circuit of the control module  200  may be configured to transmit the RF signals at a transmission frequency f TX  (e.g., approximately 2.4 GHz). In some examples, the aperture  221  in the cover portion  220 , the lens  222 , the detector  270 , and the photosensor  274  may be omitted from the control module, and the processor  275  may only be responsive to the RF signals received via the antenna  280 . 
     The second and third printed circuit boards  262 ,  263  may each comprise attachment tabs  265  (e.g., breakaway or snap tabs and/or the remains of breakaway or snap tabs). The attachment tabs  265  may be configured to attach the second and third printed circuit boards  262 ,  263  to respective fabrication panels (not shown). For example, the attachment tabs  265  may each provide a perforated connection (e.g., mouse bites) between the second and third printed circuit boards  262 ,  263  and the respective fabrication panels. Each attachment tab  265  may comprise an extended portion  266  extending from respective edges  267  of the second and third printed circuit board  262 ,  263  (e.g., in the transverse direction T) to a respective end portion  268  where the perforated connection to the respective fabrication panel may be provided. The second and third printed circuit boards  262 ,  263  may be attached to the respective fabrication panels during manufacturing of the control module  200  (e.g., during placements of the electrical components on the respective printed circuit boards and/or soldering of the electrical components to the respective printed circuit boards). After the electrical components of the control module  200  are mechanically and electrically attached (e.g., soldered) to the second and third printed circuit boards  262 ,  263 , the second and third printed circuit boards  262 ,  263  may be detached from the respective fabrication panels, for example, by breaking the perforated connections of the attachment tabs  265 . The extended portion  266  of each attachment tab  265  and the respective end portion  268  may provide spacing (e.g., in the transverse direction T) between the electrical components on the second and third printed circuit boards  262 ,  263  and the respective perforated connections between the second and third printed circuit boards  262 ,  263  and the respective fabrication panels, which may minimize damage to the electrical components when the second and third printed circuit boards  262 ,  263  are detached from the respective fabrication panels. 
       FIGS.  9  and  10    are side cross-sectional views of the control module  200  taken through the center of the second and third printed circuit boards  262 ,  263  respectively (e.g., through the lines shown in  FIG.  8   ) and showing the attachment tabs  265  in greater detail. The attachment tabs  265  may be configured to be located in gaps  269  in the enclosure  210  when the control module  200  is assembled and the first and second enclosure portions  212   a ,  212   b  are attached to each other with the printed circuit board assembly  260  captured between them. With the attachment tabs  265  received in the gaps  269 , the second and third printed circuit boards  262 ,  263  (e.g., and thus the printed circuit board assembly  260 ) may be aligned and positioned within the enclosure  210  (e.g., between the first and second enclosure portions  212   a ,  212   b ). For example, the gaps  269  may be configured to maintain (e.g., lock) the second and third printed circuit boards  262 ,  263  in the longitudinal direction L and the radial direction R. Accordingly, the attachment tabs  265  may serve the dual purpose of attaching the second and third printed circuit boards  262 ,  263  to the respective fabrication panels and aligning the second and third printed circuit boards  262 ,  263  within the enclosure  210 . 
       FIGS.  11  and  12    are perspective views of the control module  200  partially assembled (e.g., with the first enclosure portion  212   a  and the cover portion  220  removed). The antenna  280  may comprise a dipole antenna having a first antenna element  282   a  and a second antenna element  282   b . The first and second antenna elements  282   a ,  282   b  may be electrically and mechanically coupled to the third printed circuit board  263 , for example, and electrically coupled to the wireless communication circuit of the control module  200  in a dipole antenna configuration. For example, the first and second antenna elements  282   a ,  282   b  may extend through respective through-holes  276  in the third printed circuit board  263  and be soldered to electrical contacts (not shown) surrounding and/or inside of the through-holes  276 . The first and second antenna elements  282   a ,  282   b  may each comprise a thin strip of a conductive material (e.g., metal). The thin strip of conductive material may be cut and bent to form the final shapes of the first and second antenna elements  282   a ,  282   b  (e.g., as shown in  FIGS.  6 - 12   ). The first and second antenna elements  282   a ,  282   b  may be mirror images of (e.g., symmetric to) each other. 
     The first and second antenna elements  282   a ,  282   b  may each comprise a respective curved portion  284   a ,  284   b  that define ends  289   a ,  289   b  of the first and second antenna elements  282   a ,  282   b  (e.g., opposite the ends of the first and second antenna elements  282   a ,  282   b  that are received through the through-holes  276 ). The curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may be substantially planar in a plane (e.g., defined in the transverse direction T and the radial direction R) that is parallel to a plane of the front surface  223  of the cover portion  220  (e.g., parallel to a plane of the outer surface  206  of the lighting fixture  202  in which the fixture opening  204  is located). The curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may each define a circular-shaped segment having a center that is substantially aligned with the central axis  211  of the control module  200  (e.g., the center of the cylindrical housing of the detector  270 ). The curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may curve around the detector  270 . The curved portions  284   a ,  284   b  may comprise respective inner edges  287   a ,  287   b  extend along a circular path  271  (e.g., as shown in  FIG.  11   ) that has a center at the central axis  221  of the control module. The curved portions  284   a ,  284   b  may define an area A CP  that is bounded by the circular path  271  of the respective inner edges  287   a ,  287   b . For example, the area A DET  defined by the opening  272  of the detector  270  may fall within the area A CP  bounded by the circular path  271  of the inner edges  287   a ,  287   b  of the respective curved portions  284   a ,  284   b  (e.g., the detector  270  and/or the opening  272  of the detector  270  may be surrounded by the circular path  271  defined by the inner edges  287   a ,  287   b  of the respective curved portions  284   a ,  284   b ). 
     The curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may be located within the cover portion  220  (e.g., between the cover portion  220  and the flange portions  216   a ,  216   b  of the first and second enclosure elements  212   a ,  212   b ). Since the cover portion  220  and the flange portions  216   a ,  216   b  of the first and second enclosure elements  212   a ,  212   b  are configured to be located outside of the housing of the lighting fixture  202 , the curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may also be located outside of the housing  205  of the lighting fixture  202 . For example, because the rear edge  224  of the cover portion  220  is configured to contact the bottom surface of the lighting fixture  202 , the curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may be located below the bottom surface of the housing  205  of the lighting fixture  202  by an offset distance dOFFSET (e.g., approximately 0.19 inches) as shown in  FIG.  9   . For example, the curve portions  284   a ,  284   b  may operate as a primary radiating structure of the antenna  280 . Since the antenna  280  is arranged in a dipole antenna configuration with the curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  located outside of the lighting fixture  202 , the primary radiating structure of the antenna  280  (e.g., the curved portions  284   a ,  284   b ) may be located outside of the lighting fixture  202  where the RF signals may be more easily propagated from the control module  200 . In addition, the primary radiating structure of the antenna  280  (e.g., the curved portions  284   a ,  284   b ) may be located away from noise sources inside of the lighting fixture  202  (e.g., electrical circuitry of the control module  200  and/or the lighting control device of the lighting fixture, and/or electrical wires coupled to the control module  200  and/or the lighting control device). 
     The first and second antenna elements  282   a ,  282   b  may comprise respective connection portions  285   a ,  285   b  ( FIGS.  8  and  12   ) that are received in the through-holes  276 . The first and second antenna elements  282   a ,  282   b  may comprise respective elongated portions  286   a ,  286   b . After exiting the through-holes  276 , the first and second antenna elements  282   a ,  282   b  may bend (e.g., bend approximately 90 degrees) at the connection portions  285   a ,  285   b  and extend along the respective elongated portions  286   a ,  286   b  towards the cover portion  220  (e.g., in the longitudinal direction L). The elongated portions  286   a ,  286   b  may be parallel to each other, such that the first and second antenna elements  282   a ,  282   b  remain equally spaced apart along the lengths of the elongated portions  286   a ,  286   b . The elongated portions  286   a ,  286   b  may extend through the enclosure opening  213 , for example, such that the respective curved portions  284   a ,  284   b  are located outside of the housing of the lighting fixture  202 . After the elongated portions  286   a ,  286   b  exit through the enclosure opening  213 , the first and second antenna elements  282   a ,  282   b  may bend (e.g., bend approximately 90 degrees) and extend along respective offset portions  288   a ,  288   b  away from the central axis  211  of the control module  200 . The offset portions  288   a ,  288   b  may be connected to the respective curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b , such that the curve portions  284   a ,  284   b  are located farther way from the central axis  211  than the elongated portions  286   a ,  286   b . The elongated portions  286   a ,  286   b  may extend in the longitudinal direction L between the respective connection portions  285   a ,  285   b  and the respective offset portions  288   a ,  288   b . The offset portions  288   a ,  288   b  may extend in the radial direction R away from the central axis  211 . The curved portions  284   a ,  284   b  of the first and second antenna elements  282   a ,  282   b  may extend to the respective ends  289   a ,  289   b . The offset portions  288   a ,  288   b  may allow the curved portions  284   a ,  284   b  (e.g., the ends  289   a ,  289   b  of the first and second antenna elements  282   a ,  282   b ) to be located away from each other (e.g., away from the central axis  211 ), which may increase the efficiency of the antenna  280 . In addition, the offset portions  288   a ,  288   b  may allow the curved portions  284   a ,  284   b  (e.g., the ends  289   a ,  289   b ) of the first and second antenna elements  282   a ,  282   b  to be located away from the detector  270  (e.g., to prevent and/or minimize loading on the antenna  280  from the metal enclosure of the detector  270 ). 
     The detector  270  may be located at a point where the energy of the radio-frequency waves (e.g., the RF signals) generated by the antenna  280  is at a particularly high level (e.g., at a maximum level). For example, the wireless communication circuit of the control module  200  and the antenna  280  may be characterized by a transmit power greater than approximately 10 dBm (e.g., approximately 19.5 dBm). As previously mentioned, the housing  271  of the detector  270  may be made of a conductive material, such as metal. The housing  271  may be connected to circuit common (e.g., ground) of the control module  200 , such that the housing  271  may operate as an RF shield for the pyroelectrical elements of the detector  270 . 
     The opening  272  of the housing  271  of the detector  270  may be sized to shield the pyroelectrical elements of the detector  270  from the RF signals generated by the wireless communication circuit of the control module  200  and the antenna  280 , e.g., which could cause unintended detections of occupancy and/or vacancy conditions. For example, the opening  272  may be circularly shaped as shown in  FIGS.  11  and  12   . The opening  272  may have a diameter D CIR  that defines a cutoff frequency f C  above which RF signals may propagate through the opening  272  without attenuation, and below which RF signals may be attenuated when traveling through the opening  272 . For example, the cutoff frequency f c  of the opening  272  (e.g., a circular opening) may be determined as a function of the diameter D CIR  of the opening  272  and a cutoff wavelength λ C , e.g., λ C =1.706·D CIR , and f C =c/λ C , where c is the speed of light (e.g., approximately 299,792,458 m/sec). The diameter D CIR  of the opening  272  may be sized to set the cutoff frequency f C  to be larger than the transmission frequency f TX  (e.g., D CIR =0.586·c/f C ). For example, when the transmission frequency f TX  is approximately 2.4 GHz, the diameter D CIR  of the opening  272  may be approximately 4 millimeters, which may be approximately 1/30 of the transmission wavelength λ TX  at the transmission frequency f TX  and may result in a value of the cutoff frequency f C  of approximately 44 GHz. For example, the diameter D CIR  of the opening  272  may be between approximately 1/20 and 1/50 of the transmission wavelength λ TX  at the transmission frequency f TX . 
       FIG.  13    is a perspective view of another detector  270   a  that may be used in a control module (e.g., the control module  200 ). For example, the detector  270   a  may have a housing  271   a  (e.g., a cylindrical housing) having an opening  272   a  through which the infrared energy may be received by one or more pyroelectric elements of the detector  270   a . The opening  272   a  may be located in a front surface  273   a  of the housing  271   a . The housing  271   a  and/or the opening  272   a  in the housing  271   a  may be centrally located along a central axis of the control module (e.g., such as the housing  271  and the opening  272  of the housing  271  are centered along the central axis  211  of the control module  200 ). The housing  271   a  may be made of, for example, a conductive material, such as metal. The housing  271   a  may be connected to circuit common (e.g., ground) of the control module, such that the housing  271   a  may operate as an RF shield for the pyroelectrical elements of the detector  270   a.    
     The opening  272   a  of the housing  271   a  may be rectangularly-shaped, e.g., such as square-shaped as shown in  FIG.  13   . The opening  272   a  of the housing  271   a  may be sized to shield the pyroelectrical elements of the detector  270   a  from the RF signals generated by a wireless communication circuit and an antenna (e.g., the antenna  280 ) of the control module. The opening  272   a  may characterized by a distance d RECT , which may be the longest dimension of the rectangle and/or square of the opening  272   a  (e.g., the diagonal dimension from one corner to the opposite corner). For example, when the opening  272   a  is a square as shown in  FIG.  13   , the distance d RECT  may be the length between one corner to the opposing corner of the square. The distance d RECT  of the opening  272   a  may define a cutoff frequency f c  above which RF signals may propagate through the opening  272   a  without attenuation, and below which RF signals may be attenuated when traveling through the opening  272   a . For example, the cutoff frequency f C  of the opening  272   a  (e.g., a rectangular opening) may be determined as a function of the distance d RECT  and a cutoff wavelength λ C , e.g., λ C =d RECT , and f C =c/λ C , where c is the speed of light (e.g., approximately 299,792,458 m/sec). The distance d RECT  of the opening  272   a  may be sized to set the cutoff frequency f c  to be larger than the transmission frequency f TX  (e.g., d RECT =0.5·c/f C ). For example, the distance d RECT  of the opening  272   a  may sized to be between approximately 1/20 and 1/50 of the transmission wavelength λ TX  at the transmission frequency f TX . 
       FIG.  14    is a perspective view of another detector  270   b  that may be used in a control module (e.g., the control module  200 ) illustrating how a shield  290   b  may used to reshape and/or resize an opening  272   b  through which the infrared energy is received by the detector  270   b . For example, the detector  270   b  may have a housing  271   b  (e.g., a cylindrical housing) having a front surface  273   b  in which the opening  272   b  is located. The housing  271   b  and/or the opening  272   b  in the housing  271   b  may be centrally located along a central axis of the control module (e.g., such as the housing  271  and the opening  272  of the housing  271  are centered along the central axis  211  of the control module  200 ). The housing  271   b  may be made of, for example, a conductive material, such as metal. The housing  271   b  may be connected to circuit common (e.g., ground) of the control module, such that the housing  271   b  may operate as an RF shield for the pyroelectrical elements of the detector  270   b . While the opening  272   b  is shown as being rectangularly shaped in  FIG.  14   , the opening  272   b  may also be circularly shaped (e.g., as with the opening  272  of the detector  270  shown in  FIG.  12   ). The opening  272   b  of the housing  271   b  of the detector  270  may define an area A DET . 
     The shield  290   b  may comprise an opening  292   b  that extends through the shield  290   b . The shield  290   b  may be made of a conductive material. For example, the shield  290   b  may be a conductive sticker that is adhered to the front surface  273   b  of the housing  271   b  of the detector  270   b . The shield  290   b  may comprise a conductive adhesive on a bottom surface  294   b  of the shield for adhering the shield  290   b  to the front surface  273   b  of the housing  271   b  and for electrically coupling the shield  290   b  to the housing  271   b  of the detector  270   b . In addition, the shield  290   b  may be mechanically and/or electrically coupled to the housing  271   b  of the detector  270   b  via other means, such as, for example, a clip or other attachment member. Since the housing  271   b  of the detector  270   b  is electrically coupled to circuit common of the control module, the shield  290   b  may also be electrically coupled to circuit common. 
     The opening  292   b  of the shield  290   b  may be sized to shield the pyroelectrical elements of the detector  270   b  from the RF signals generated by the control module. If the opening  272   b  of the housing  271   b  of the detector  270   b  is not able to block the RF signals at the transmission frequency f TX  of the control module (e.g., the length of the largest dimension of the opening  270   b  may result in a cutoff frequency f c  is below the transmission frequency f TX ), the shield  290   b  may be installed on the front surface  273   b  of the housing  271   b  with the opening  292   b  of the shield  290   b  overlayed overtop of the opening  272   b  of the housing  271   b  to thus appropriately shield the pyroelectric element of the detector  270   b  from the RF signals generated by the control module. The opening  292   b  of the shield  290   b  may define an area A SH  that falls within the area of the opening  272   b  of the housing  271   b  of the detector  270   b  (e.g., to decrease the size of the opening, such as the planar area of the opening). The area A SH  of the opening  292   b  of the shield  290   b  may be smaller than the area A DET  of the opening  272   b  of the housing  271   b  of the detector  270 . For example, the opening  292   b  may be a circular opening as shown in  FIG.  14    (e.g., to reshape the opening  272   b ). The opening  292   b  may have a diameter D CIR  that may be sized to block RF signals in a similar manner as the opening  272  of the detector  270  shown in  FIGS.  12  and  13   . The diameter D CIR  of the opening  292   b  may be sized to set the cutoff frequency f c  be larger than the transmission frequency f TX  (e.g., D CIR =0.586·c/f C ). For example, when the transmission frequency f TX  is approximately 2.4 GHz, the diameter D CIR  of the opening  292   b  of the shield  290   b  may be approximately 4 millimeters, which may be approximately 1/30 of the transmission wavelength λ TX  at the transmission frequency f TX  and may result is a value of the cutoff frequency f C  of approximately 44 GHz. For example, the diameter D CIR  of the opening  292   b  may be between approximately 1/20 and 1/50 of the transmission wavelength λ TX  at the transmission frequency f TX . In addition, the opening  292   b  of the shield  290   b  may be rectangularly-shaped, e.g., such as square-shaped as shown in  FIG.  13    (e.g., to decrease the size of the opening, such as the planar area of the opening). 
       FIG.  15    is a perspective view of another detector  270   c  that may be used in a control module (e.g., the control module  200 ). For example, the detector  270   c  may have a housing  271   c  (e.g., a cylindrical housing) having an opening  271   c  through which the infrared energy may be received by one or more pyroelectric elements of the detector  270   c . The opening  272   c  may be located in a front surface  273   c  of the housing  271   c . The housing  271   c  and the opening  272   c  in the housing  271   c  may be centrally located along a central axis of the control module (e.g., such as the housing  271  and the opening  272  of the housing  271  are centered along the central axis  211  of the control module  200 ). The housing  271   c  may be made of, for example, a non-conductive material, such as plastic. While the opening  272   c  is shown as being rectangularly shaped in  FIG.  15   , the opening  272   c  may also be circularly shaped (e.g., as with the opening  272  of the detector  270  shown in  FIG.  12   ). 
     The detector  270   c  may be surrounded by a shield  290   c  (e.g., even though the shield  290   c  is shown above the detector  270   c  in  FIG.  15   ). The shield  290   c  may comprise an opening  292   c  that may be located over the front surface  273   c  of the housing  271   c  with the opening  292   c  overlayed over the top of the opening  272   c  of the housing  271   c  to shield the pyroelectric element of the detector  270   c  from the RF signals generated by the control module (e.g., in a similar manner as the shield  290   b  with the opening  292   b  shields the detector  270   b ). The shield  290   c  may comprise a sidewall  296   c  (e.g., a cylindrical sidewall) that may surround the housing  271   c  of the detector  270   c . The shield  290   c , and may comprise one or more projections  296   c  (e.g., tabs and/or posts) that extend from a lower edge  298   c  of the sidewall  295   c . The projections  296   c  may be made of a conductive material, and may be attached to circuit common on the control module, such that the shield  290   c  may also be electrically coupled to circuit common. For example, the projections  296   c  may be received in through-holes in a printed circuit board on which the detector  270   c  is mounted (e.g., the first printed circuit board  261 ) and may be soldered to electrical pads surrounding the through-holes for electrically coupling the shield  290   c  to circuit common. In addition, the projections  296   c  may each extend from the sidewall  295   c  in a perpendicular direction (e.g., perpendicular to the sidewall  295   c ) and/or may each be bent at approximately a right angle, such that the projections  296   c  may be soldered to electrical pads on the printed circuit board (e.g., the first printed circuit board  261 ). 
     The opening  292   c  of the shield  290   c  may be sized to shield the pyroelectrical elements of the detector  270   c  from the RF signals generated by the control module (e.g., in a similar manner as the opening  292   b  in the shield  290   b  is sized) when the shield  290   c  is surrounding the housing  271   c  of the detector  270   c  (e.g., the shield  290   c  is mechanically and electrically coupled to the printed circuit board). In addition, the opening  292   c  of the shield  290   c  may be rectangularly-shaped, e.g., such as square-shaped as shown in  FIG.  13    (e.g., to decrease the size of the opening, such as the planar area of the opening). 
       FIGS.  16 A and  16 B  are block diagrams of an example load control system  300  in first and second configurations, respectively. The load control system  300  may comprise a control module  310  (e.g., a sensor device), which may be deployed as the control modules  120   a - 120   d  of the load control system  100  shown in  FIG.  1    and/or the control module  200  shown in  FIGS.  2 - 12   . In addition, the load control system  300  may comprise a first load regulation device, such as a first lighting control device  330 , in the first configuration (e.g., as shown in  FIG.  16 A ) and a second load regulation device, such as a second lighting control device  340 , in the second configuration (e.g., as shown in  FIG.  16 B ). The first and second lighting control devices  330 ,  340  may be LED drivers and may be examples of the lighting control devices of the lighting control devices of the lighting fixtures  110   a - 110   d  of the load control system  100  of  FIG.  1   . The first and second lighting control devices  330 ,  340  may be electrically coupled to an alternating-current (AC) power source (not shown) via power wires  304  for receiving an AC mains lines voltage V AC  from the AC power source. The first and second lighting control devices  330 ,  340  may each be configured to control an amount of power delivered from the AC power source to an electrical load, such as a lighting load  302  (e.g., an LED light source). The lighting load  302  and the control module  310  may be configured to be installed in and/or onto a lighting fixture (e.g., one of the lighting fixtures  110   a - 110   d  shown in  FIG.  1    and/or the lighting fixture  202  shown in  FIG.  2   ) along with the first lighting control device  370  in the first configuration and the second lighting control device  380  in the second configuration. 
     The control module  310  may comprise a control connector  312  (e.g., the connector  250  of the sensor module  200  shown in  FIGS.  2 - 12   ) configured to be electrically connected to the first lighting control device  330  in the first configuration and the second lighting control device  340  in the second configuration. For example, the module connector  312  of the control module  310  may comprise four electrical terminals (e.g., the electrical terminals  252 ,  254 ). The control module  310  may be configured to receive power via the control connector  312  for powering the electrical circuitry of the control module  310 . The control module  310  may also be coupled to the first lighting control device  330  and/or the second lighting control device  340  via the control connector  312 . 
     The control module  310  may comprise a module control circuit  314  for controlling the operation of the control module  310 . For example, the module control circuit  314  may comprise one or more of a processor (e.g., a microprocessor), a microcontroller, a programmable logic device (PLD), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or any suitable controller or processing device. The control module  310  may also include a memory (not shown). The memory may be communicatively coupled to the module control circuit  314  for the storage and/or retrieval of, for example, operational settings of the control module  310 . In addition, the memory may be configured to store software for execution by the module control circuit  314  to operate the control module  310 . The memory may be implemented as an external integrated circuit (IC) and/or as an internal circuit of the module control circuit  314 . 
     The control module  310  may comprise a wireless communication circuit  316  configured to communicate with control devices of the load control system via wireless signals, such as RF signals (e.g., the RF signals  104 ,  105  shown in  FIG.  1   ). The wireless communication circuit  316  may include for example, one or more radio-frequency (RF) transceivers coupled to an antenna  318  (e.g., the antenna  280 ) for communicating (e.g., transmitting and/or receiving) the RF signals. The wireless communication circuit  316  may also include one or more of an RF transmitter for transmitting RF signals and/or an RF receiver for receiving RF signals. The wireless communication circuit  316  may be configured to communicate (e.g., transmit and/or receive) messages (e.g., digital messages) via the RF signals. For example, the wireless communication circuit  316  may be configured to transmit and/or receive messages on a first wireless communication link using a first wireless protocol (e.g., via the RF signals  104  on the wireless network communication link using the wireless network communication protocol), and on a second wireless communication link using a second wireless protocol (e.g., via the RF signals  105  on the short-range wireless communication link using the short-range wireless communication protocol). For example, the wireless communication circuit  316  may comprise a single RF transceiver configured to communicate on the wireless network communication link and the short-range wireless communication link, or multiple (e.g., two) RF transceivers, such as a first RF transceiver for communicating on the wireless network communication link and a second RF transceiver for communicating on the short-range wireless communication link. The messages received by the module control circuit  315  via the RF signals may include configuration data for configuring the control module  310  and/or control data (e.g., commands) for controlling the lighting load  302 . The configuration data and/or control data may include identification information (e.g., such as a unique identifier) associated with the control module  310 . While shown separately from the module control circuit  314  in  FIGS.  16 A and  16 B , the wireless communication circuit  316  may also be implemented as an internal circuit of the module control circuit  314 . 
     The control module  300  may comprise an occupancy sensing circuit  320  configured to sense (e.g., detect) an occupancy and/or vacancy condition in the vicinity of the lighting fixture in which the control module  300  is installed (e.g., in the room  102 ). The occupancy sensing circuit  320  may comprise a detector (e.g., the detector  270 ) for detecting an occupancy and/or vacancy condition in the space. For example, the occupancy sensing circuit  320  may comprise a passive infrared (PIR) sensing circuit, where the detector is a pyroelectric detector. In addition, the detector may comprise one or more of an ultrasonic detector, and/or a microwave detector. For example, a pyroelectric detector may be configured to receive infrared energy from an occupant in the space below the control module  200  (e.g., below the lighting fixture) through a lens (e.g., the lens  222  shown in  FIGS.  2 - 10   ) to thus sense the occupancy condition in the space. The module control circuit  314  may be configured to determine a vacancy condition in the space after a timeout period expires since the last occupancy condition was detected. The module control circuit  314  may be configured to control the first and/or second lighting control device  330 ,  340  to turn the lighting load  304  on and off and to adjust the intensity level of the lighting load  304  in response to the occupancy sensing circuit  320  detecting occupancy and/or vacancy conditions. 
     The control module  300  may further comprise a photo-sensing circuit  322  configured to measure a light level (e.g., an ambient light level and/or a daylight level) in the vicinity of the lighting fixture in which the control module  300  is installed (e.g., in the room  102 ). The photo-sensing circuit  322  may comprise a photosensor (e.g., the photosensor  274 ) for measuring the light level in the space. For example, the photosensor may be configured to receive light from the space below the control module  200  (e.g., below the lighting fixture) through the lens (e.g., the lens  222 ) to thus measure the light level in the space. The module control circuit  314  may be configured to control the first and/or second lighting control device  330 ,  340  to turn the lighting load  304  on and off and to adjust the intensity level of the lighting load  304  in response to the light level measured by the photo-sensing circuit  322 . 
     The control module  310  may one or more circuits coupled to the control connector  312  for receiving power and/or controlling the first and/or second lighting control devices  330 ,  340  (e.g., depending on whether the load control system  300  is in the first configuration or the second configuration as will be described in greater detail below). The control module  310  may comprise a module power supply  324  (e.g., an internal power supply) configured to receive power via the electrical terminals  312   a ,  312   b  of the control connector  312  and generate a direct-current (DC) module supply voltage V CC  for powering the module control circuit  314 , the wireless communication circuit  316 , the occupancy sensing circuit  320 , the photo-sensing circuit  322 , and/or other electrical circuitry of the control module. The control module  310  may comprise a first wired communication circuit  326  which may be coupled to two electrical terminals  312   c ,  312   d  of the control connector  312  and may be used to communicate with the first lighting control device  330  in the first configuration. The control module  310  may comprise a second wired communication circuit  328  which may be coupled to the electrical terminals  312   a ,  312   b  of the control connector  312  and may be used to communicate with the second lighting control device  340  in the second configuration. 
     When the load control system  300  is in the first configuration as shown in  FIG.  16 A , the control module  310  may be coupled to the first lighting control device  330  via a four-wire control link  339 . The first lighting control device  330  may comprise a power connector  331  configured to be electrically coupled to the AC power source via the power wires  304  for receiving the AC mains lines voltage V AC  and a load connector  332  configured to be electrically coupled to the lighting load  302 . The first lighting control device  330  may also comprise a control connector  333  that may be configured to be electrically coupled to the control module  310  via the four-wire control link  339 . For example, the control connector  333  of the first lighting control device  330  may comprise four electrical terminals as shown in  FIG.  16 A . 
     The first lighting control device  330  may comprise a load regulation circuit  334  (e.g., an LED drive circuit) that may be coupled between the power connector  331  and the load connector  332  and may be configured to control the amount of power delivered to the lighting load  302 . The first lighting control device  330  may comprise a module power supply  335  coupled to receive the AC mains line voltage V AC  via the power connector  331  and generate a link supply voltage V LINK  for powering the control module  310  via the control connector  333 . The module power supply  324  of the control module  310  may receive the link supply voltage V LINK  via the electrical terminals  312   a ,  312   b  of the control connector  312 . 
     The first lighting control device  330  may comprise a driver control circuit  336  configured to control the load regulation circuit  334  to adjust the amount of power delivered to the lighting load  302  to adjust an intensity level of the lighting load. The first lighting control device  330  may further comprise a wired communication circuit  338  configured to be coupled to the control module  310  via the control connector  333  (e.g., the four-wire control link  339 ). The wired communication circuit  338  of the first lighting control device  330  may be coupled to the first wired communication circuit  326  of the control module  310  via the electrical terminals  312   c ,  312   d  of the control connector  312 . The first wired communication circuit  326  of the control module  310  may be configured to generate, for example, an analog control signal, such as a 0-10V control signal, at the electrical terminals  312   c ,  312   d  of the control connector  312 . For example, the first wired communication circuit  326  of the control module  310  may comprise a current sink circuit configured to draw current from the wired communication circuit  338  of the first lighting control device  330  to generate the 0-10V control signal at the electrical terminals  312   c ,  312   d  of the control connector  312 . The driver control circuit  336  of the first lighting control device  330  may be configured to adjust the intensity level of the lighting load  304  in response to a magnitude of the analog control signal received by the wired communication circuit  338 . Alternatively or additionally, the first wired communication circuit  326  of the control module  310  may be configured to transmit messages (e.g., digital messages) to the wired communication circuit  338  of the first lighting control device  330  according to a digital communication protocol. For example, the first wired communication circuit  326  of the control module  310  and the wired communication circuit  338  of the first lighting control device  330  may comprise RS-485 communication circuits. The driver control circuit  336  of the first lighting control device  330  may be configured to adjust the intensity level of the lighting load  304  in response to control data (e.g., commands) included in the messages received by the wired communication circuit  338 . When the control module  310  is wired to the first lighting control device  330  in the first configuration, the module control circuit  314  of the control module  310  may be configured to disable the second wired communication circuit  328 . 
     When the load control system  300  is in the second configuration as shown in  FIG.  16 B , the control module  310  may be coupled to the second lighting control device  340  via a two-wire control link  349 . The second lighting control device  340  may comprise a power connector  341  configured to be electrically coupled to the AC power source via the power wires  304  for receiving the AC mains lines voltage V AC  and a load connector  342  configured to be electrically coupled to the lighting load  302 . The second lighting control device  340  may also comprise a control connector  343  that may be configured to be electrically coupled to the control module  310  via the four-wire control link  349 . For example, the control connector  343  of the first lighting control device  340  may comprise two electrical terminals as shown in  FIG.  16 B . 
     The second lighting control device  340  may comprise a load regulation circuit  344  (e.g., an LED drive circuit) that may be coupled between the power connector  341  and the load connector  342  and may be configured to control the amount of power delivered to the lighting load  302 . The second lighting control device  340  may comprise a driver control circuit  346  configured to control the load regulation circuit  344  to adjust the amount of power delivered to the lighting load  302  to adjust the intensity level of the lighting load. The second lighting control device  340  may further comprise a wired communication circuit  348  configured to be coupled to the control module  310  via the control connector  343  (e.g., the two-wire control link  339 ). The wired communication circuit  348  of the first lighting control device  340  may be coupled to the second wired communication circuit  328  of the control module  310  via the electrical terminals  312   a ,  312   b  of the control connector  312 . The second wired communication circuit  328  of the control module  310  may be configured to transmit messages (e.g., digital messages) to the wired communication circuit  348  of the first lighting control device  340  according to a digital communication protocol, e.g., such as the Digital Lighting Control Interface (DALI) protocol. The driver control circuit  346  of the second lighting control device  340  may be configured to adjust the intensity level of the lighting load  304  in response to control data (e.g., commands) included in the messages received by the wired communication circuit  348 . 
     In the second configuration, the control module  310  may be configured to receive power from the two-wire control link  349  via the electrical terminals  312   a ,  312   b  of the control connector  312  (e.g., the two-wire control link  349  may be a dual-purpose power and communication link), and the electrical terminals  312   c ,  312   d  of the control connector  312  may remain unconnected. The second lighting control device  340  may not comprise a module power supply for powering the control module  310 . For example, the lighting control system  300  may comprise a bus power supply  306  in the second configuration. The bus power supply  306  may be configured to receive the AC mains line voltage V AC  from the AC power source and generate a bus voltage V BUS , which may be electrically coupled to the two-wire control link  349  (e.g., the electrical terminals  312   a ,  312   b  of the control connector  312 ) to provide for communications on the two-wire control link  349  as well as to power the control module  310 . The bus power supply  306  may be external to the lighting fixture on which the control module  310  is installed and/or may be included in the lighting fixture in which the control module  310  is installed. The module power supply  324  of the control module  310  may receive the bus voltage V BUS  via the electrical terminals  312   a ,  312   b  of the control connector  312  (e.g., when the second wired communication circuit  326  of the control module  310  and/or the wired communication circuit  348  of the second lighting control device  340  are not transmitting messages on the two-wire control link  349 ). Additionally and/or alternatively, the bus power supply  306  may be included in the second lighting control device  340 . 
     While this disclosure has been described in terms of certain embodiments and generally associated methods, alterations and permutations of the embodiments and methods will be apparent to those skilled in the art. Accordingly, the above description of example embodiments does not constrain this disclosure. Other changes, substitutions, and alterations are also possible without departing from the spirit and scope of this disclosure.