Patent Publication Number: US-2021165542-A1

Title: Solution for providing visual output representing maintenance related information of a people transport system or an acess control system

Description:
RELATED APPLICATIONS 
     This application claims priority to European Patent Application No. 19212769.4 filed on Dec. 2, 2019, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The invention concerns in general the technical field of people transport and access control systems. Especially the invention concerns maintenance interface devices of the people transport and maintenance interface devices of access control systems. 
     BACKGROUND 
     Typically, people transport systems, such as elevator systems, escalator systems, and moving walkway systems, or access control systems, such as automatic door systems, turnstile systems, gate systems, may comprise one or more maintenance interface devices, such as test and emergency panel, e.g. a maintenance access panel (MAP), for providing one or more maintenance, test, inspection and/or emergency operations of the conveyor system. Typically in elevator systems the maintenance interface devices may be arranged outside an elevator shaft, for example inside a machine room of the elevator system or at a landing, to enable that the one or more maintenance, test, inspection and/or emergency operations of the conveyor system may be carried out via the maintenance interface device from outside the shaft. The maintenance interface devices shall be accessible to authorized persons only. 
     Typically, the maintenance interface devices may comprise physical input devices, such as buttons, keyboard, keypad, touch screen and similar, for receiving user input. Moreover, the maintenance interface devices may typically comprise physical output devices as display, loudspeaker, touch screen, and similar, for providing visual or audible output detectable by the user of the maintenance interface device, such as maintenance personnel. 
     It may be beneficial to provide improved solutions for the maintenance interface devices. 
     SUMMARY 
     The following presents a simplified summary in order to provide basic understanding of some aspects of various invention embodiments. The summary is not an extensive overview of the invention. It is neither intended to identify key or critical elements of the invention nor to delineate the scope of the invention. The following summary merely presents some concepts of the invention in a simplified form as a prelude to a more detailed description of exemplifying embodiments of the invention. 
     An objective of the invention is to present a maintenance interface system and a method for providing a visual output representing maintenance related information of a people transport system or access control system. Another objective of the invention is that the maintenance interface system and the method for providing a visual output representing maintenance related information of a people transport system or access control system enable providing an adaptable user interface for maintenance purposes in people transport systems or access control systems. 
     The objectives of the invention are reached by a maintenance interface system and a method as defined by the respective independent claims. 
     According to a first aspect, a maintenance interface system for providing a visual output representing maintenance related information of a people transport system or access control system is provided, wherein the maintenance interface system comprising: a storage unit having maintenance related information of the people transport system or the access control system stored thereon, and a user device arranged to: receive at least part of the stored maintenance related information from the storage unit in response to detecting an activation event, and provide a visual output representing the received maintenance related information. 
     The provided visual output may be augmented reality display, virtual reality display, or mixed reality display. 
     The user device may further comprise one or more input devices and/or one or more sensor devices arranged to detect user indication, wherein the user device may be arranged to generate at least one control signal to a control unit of the people transport system or the access control system for controlling one or more operations of the people transport system or the access control system and/or one or more operational parameters of the people transport system or the access control system in association with the detected user indication. 
     The user indication may comprise at least one of the following: gesture, gaze, voice, touch. 
     The detected activation event may be one of the following: manual activation, automatic activation. 
     Moreover, detecting the automatic activation event may comprise: detecting a location of the user device, or detecting the user device in a vicinity of the people transport system or the access control system. 
     The part of the maintenance related information represented with the provided visual output may depend on an access level assigned for the user device. 
     The user device may be a wearable smart device, a mobile terminal device, or a digital user device comprising one or more displays or other capability to display the visual output. 
     The people transport system may be one of the following: an elevator system, an escalator system, or a moving walkway system, and the access control system may be one of the following: automatic door system, turnstile system, gate system. 
     According to a second aspect, a method for providing visual output representing maintenance related information of a people transport system or the access control system is provided, wherein the method comprising: detecting an activation event; receiving, by a user device, at least part of maintenance related information of the people transport system or the access control system stored on a storage unit; and providing, by the user device, a visual output representing the received maintenance related information. 
     The provided visual output may be augmented reality display, virtual reality display, or mixed reality display. 
     The method may further comprise: detecting, by one or more input devices and/or one or more sensor devices of the user device, user indication; and generating, by the user device, at least one control signal to a control unit of the people transport system or the access control system for controlling one or more operations of the people transport system or the access control system and/or one or more operational parameters of the people transport system or the access control system in association with the detected user indication. 
     The user indication may comprise at least one of the following: gesture, gaze, voice, touch. 
     The detected activation event may be one of the following: manual activation, automatic activation. 
     Moreover, detecting the automatic activation event may comprise: detecting a location of the user device or detecting the user device in a vicinity of the people transport system or the access control system. 
     The part of the stored maintenance related information represented with the provided visual output may depend on an access level assigned for the user device. 
     The user device may be a wearable smart device, a mobile terminal device, or a digital user device comprising one or more displays or other capability to display the visual output. 
     The people transport system may be one of the following: an elevator system, an escalator system, a moving walkway system; and the access control system may be one of the following: automatic door system, turnstile system, gate system. 
     Various exemplifying and non-limiting embodiments of the invention both as to constructions and to methods of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific exemplifying and non-limiting embodiments when read in connection with the accompanying drawings. 
     The verbs “to comprise” and “to include” are used in this document as open limitations that neither exclude nor require the existence of unrecited features. The features recited in dependent claims are mutually freely combinable unless otherwise explicitly stated. Furthermore, it is to be understood that the use of “a” or “an”, i.e. a singular form, throughout this document does not exclude a plurality. 
    
    
     
       BRIEF DESCRIPTION OF FIGURES 
       The embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings. 
         FIG. 1A  illustrates schematically an example of a people transport system in which a maintenance interface system according to a present invention may be implemented. 
         FIG. 1B  illustrates schematically an example of an access control system in which a maintenance interface system according to the present invention may be implemented. 
         FIG. 2  illustrates schematically an example of a maintenance interface system according to the present invention. 
         FIG. 3  illustrates schematically an example of a method according to the present invention. 
         FIGS. 4A-4C  illustrate schematically other examples of a maintenance interface system according to the present invention. 
         FIGS. 5A-5C  illustrate schematically examples views of a visual output according to the present invention. 
         FIG. 6  illustrates schematically another example of a method according to the present invention. 
         FIG. 7  schematically illustrates an example of a user device according to the present invention. 
     
    
    
     DESCRIPTION OF THE EXEMPLIFYING EMBODIMENTS 
     At least some aspects of embodiments according to the present invention may be described, at least in partly, by referring to  FIGS. 1A and 1B .  FIG. 1A  illustrates a non-limiting example of people transport system  100  in which a maintenance interface system  200  according to the present invention may be implemented.  FIG. 1B  illustrates a non-limiting example of an access control system  120  in which a maintenance interface system  200  according to the present invention may be implemented The people transport system  100  may be one of the following: an elevator system, an escalator system, a moving walkway system. The access control system  120  may be one of the following: automatic door system, turnstile system, gate system. 
       FIG. 1A  schematically illustrates an example a people transport system  100  being an elevator system. The example elevator system  100  comprises an elevator car  102  and a hoisting machine  104  arranged to drive the elevator car  102  along an elevator shaft  106  between landings  108   a - 108   n . A control unit  110   a , such as an elevator control unit, may be arranged to control the operation of the elevator system  100  at least in part. The elevator control unit  110   a  may reside for example in a machine room  112  or in one of the landings  108   a - 108   n . The elevator car  102  may comprise an elevator car door  114  and each landing  108   a - 108   n  may comprise a landing door  114 . 
       FIG. 1B  schematically illustrates an example of an access control system  120  being an automatic door system. The automatic door system  120  comprises an automatic door  114  and a control unit  110   b , such as door control unit, arranged to control the operation of the automatic door system  100  at least in part. The automatic door  114  may be for example a building door or an elevator door, such as car door and/or landing door. 
     The people transport system  100  and/or the access control system  120  may comprise only the maintenance interface system  200  according to embodiments of the present invention. In other words, a traditional physical maintenance interface device  116  may be replaced with the maintenance interface system  200  according to embodiments of the present invention. One or more maintenance, test, inspection and/or emergency operations of the system may be carried out via the maintenance interface system  200  according to embodiments of the present invention. Alternatively, the people transport system  100  and/or the access control system  120  may comprise the maintenance interface system  200  according to embodiments of the present invention and the traditional physical maintenance interface device  116  as illustrated in the examples of  FIGS. 1A and 1B . In other words, the maintenance interface system  200  according to embodiments of the present invention may be used to supplement the traditional physical maintenance interface device  116 . One or more maintenance, test, inspection and/or emergency operations of the system may be carried out via the maintenance interface system  200  according to embodiments of the present invention at least in part and/or via the traditional physical maintenance interface device  116  at least in part. The traditional maintenance interface device  116  shall be accessible to authorized persons only. In elevator systems  100 , the traditional physical maintenance interface device  116  may be arranged outside the elevator shaft  106 , for example inside the machine room of the elevator system as illustrated in the example of  FIG. 1A  or at a landing. 
       FIG. 2  illustrates schematically an example of the maintenance interface system  200  according to the present invention. The maintenance interface system may provide a visual output representing maintenance related information of the people transport system  100  or the access control system  120  dependent on the system  100 ,  120  into which the maintenance interface system  200  is implemented. If the maintenance interface system  200  is implemented in the people transport system  100 , the maintenance interface system  200  may provide visual output representing maintenance related information of the people transport system  100 . Alternatively, if the maintenance interface system  200  is implemented in the access control system  120 , the maintenance interface system  200  may provide visual output representing maintenance related information of the access control system  120 . 
     The maintenance interface system  200  may comprise a storage unit  202  and a user device  204 . The storage unit  202  may be for example a computing entity, cloud storage, or other digital media storage or system. The storage unit  202  may have maintenance related information of the people transport system  100  or the access control system  120  stored thereon. The storage unit  202  may be communicatively coupled to the control unit  110   a  of the people transport system  100  or to the control unit  110   b  of the access control system  120  in order to be able to obtain maintenance related information of the people transport system  100  or the access control system  120 . The communication between the control unit  110   a ,  110   b  and the storage unit  202  may be implemented in a wired manner or wirelessly at least in part. According to an embodiment of the invention, the storage unit  202  may be implemented as a part of the control unit  110   a  of the people transport system  100  or the control unit  110   b  of the access control system  120 . According to another embodiment of the invention, the storage unit  202  may be an external storage unit. Some non-limiting examples of the external storage units may e.g. be a remote server, cloud server, computing unit, a network of computing devices. The external unit herein means a unit that locates separate from the people transport system  100  or the access control system  120 . In the example of  FIG. 2 , the user device  204  is implemented as a set of smart glasses, but the user device  204  may be any other wearable smart device, such as watch; a mobile terminal device, such as mobile phone, tablet computer, etc.; or any other digital user device comprising one or more displays or other capability, such as a projector, to display the maintenance related information according to the embodiments of the present invention as will be described. 
     Now, at least some aspects of the present invention may be described by referring to  FIG. 3  in which a method according to an embodiment of the present invention is schematically illustrated. 
     In the step  310  an activation event may be detected. The detected activation event may be manual activation or automatic activation. The detection of the manual activation event may be a detection of a user indication. The user indication may be provided for example via the user device  204 , e.g. user interaction with the user device  204  and a user, e.g. a maintenance personnel, of the user device  204 . The use device  204  may comprise one or more input devices, such as buttons, touchscreen, touch-buttons or similar, for providing the user indication indicating activation of the user device  204 . For example, the manual activation event may be a touch, e.g. with a finger or any other pointer, on a touch button of the user device  204 . 
     Detecting the automatic activation event may comprise detecting a location of the user device  204 . In other words, detecting the automatic activation event may comprise detecting that the user device  204  resides, i.e. locates, at a predefined location. The predefined location may be for example a machine room; a service center; an environment of the people conveyor system  100  or access control system  120 ; e.g. a specific landing in an elevator system; any other location suitable for performing maintenance operations. The location detection may be based on any indoor positioning system; Global Positioning System (GPS) or any other outdoor positioning system; any visual image recognition system; a digital readable optical code system, such as barcode, QR code, or any other digital readable optical code; or a radio-frequency system, such as a radio-frequency identification (RFID) system or any other RF-based solution. For example, the user device  204  may detect the automatic activation event by detecting that the user device  204  locates at the predefined location by using any indoor or outdoor positioning system or any visual image recognition system. Alternatively, the user device  204  may comprise scanning and/or reader devices capable to scan and read the digital readable optical code and/or an RFID tag. The digital readable optical code and/or RFID tag may be arranged in the predefined location. The user device  204  may detect the automatic activation event by reading the digital readable optical code and/or the RFID tag. 
     Alternatively, detecting the automatic activation event may comprise detecting the user device  204  in a vicinity of the people transport system  100  or the access control system  120 , i.e. within the environment of the of the people conveyor system  100  or access control system  120 . The user device  204  detection may be based on any visual image recognition system; a digital readable optical code system, such as barcode, QR code, or any other digital readable optical code; or a radio-frequency identification (RFID) system. For example, the user device  204  may comprise scanning and/or reader devices capable to scan and read the digital readable optical code and/or RFID tag. The digital readable optical code and/or an RFID tag may be arranged at a suitable location within the environment of the of the people conveyor system  100  or access control system  120 . The user device  204  detects the automatic activation event in response to reading the digital readable optical code and/or the RFID tag. 
     In the step  320  the user device  204  may receive at least part of the stored maintenance related information from the storage unit  202  in response to detecting the activation event. The maintenance related information may comprise, but is not limited to, equipment data; maintenance history data; instructions and documentations, recommended maintenance actions, e.g. based on remote data analysis, data from one or more sensors, usage data, or any other kind of analytics based data, calendar based maintenance or other planned maintenance; equipment type or model; performance data, operational parameters of the system; and/or real time or delayed video image from one or more imaging devices, such as cameras, arranged on site. 
     In the step  330  the user device  204  may provide a visual output  410 , i.e. a display, representing the received maintenance related information by the user device  204 . The user device  204  may display the received maintenance related information e.g. on the one or more displays of the user device  204  or through projection by the projector of the user device  204 . The provided visual output  410  may act as a digital maintenance interface device of the people transport system  100  or the access control system  120 . With the term “digital maintenance interface device” is meant throughout this application a user interface displaying the received maintenance related information, wherein the user interface is not a physical maintenance interface device, such as a maintenance access panel, of the people transport system  100  or the access control system  120 . The visual output  410  may be created, i.e. implemented, with augmented reality (AR), virtual reality (VR), or mixed reality (MR). Alternatively, the visual output  410  representing the received maintenance related information may be displayed on the one or more displays of the user device  204 , such as a mobile phone, a tablet computer, a smart watch, or any other digital user device comprising one or more displays or other capable to display the visual output  410 . This enables a simple way to provide the visual output  410 . 
     In the augmented reality the visual output  410  representing the received maintenance related information, e.g. augmented reality display, may be overlaid on a real-world environment. The visual output  410  implemented with augmented reality display, i.e. augmented reality interface, may be placed virtually on any surface or location. The augmented reality display may e.g. be a see-through augmented reality display or a projected augmented reality display. The see-through augmented reality display may be displayed on a display or a screen of the user device  204 , such as a video see-through display or a holographic based see-through display. The projected augmented reality display, i.e. spatial augmented reality display, may be projected on a wall, a panel, or any similar surface. The augmented reality display may be relative to the view of the user of the user device  204 , relative to the user device  204 , or floating in a static spatial location, i.e. relative to spatial direction. An augmented reality display being relative to the view of the user of the user device  204  means that the augmented reality display is in the same place in relation to the user, when the augmented reality display is activated. In other words, when the user turns their head, the augmented reality display moves accordingly so that the reality display is in the same place in relation to the user. For example, e.g. the augmented reality display may be at a predefined distance from the head of the user, when the augmented reality display is activated, e.g. at a one meter distance from the head of the user. According to an example, if user device  204  is a mobile terminal device, e.g. a tablet computer, when the user places the mobile terminal device in front of their face the augmented reality display may be visible, but if the mobile terminal device is lowered and directed, e.g. by the user of the mobile terminal device, e.g. towards floor, the augmented reality display may no longer visible. An augmented reality display being relative to the user device  204  means that the augmented reality display is in the same place in relation to the user device  204 , when the augmented reality display is activated. In other words, when the user device  204  is moved e.g. by the user of the user device, the augmented reality display moves accordingly so that the reality display is in the same place in relation to the user device  204 . For example, e.g. the augmented reality display may be at a predefined distance from the user device  204  at a predefined direction, when the augmented reality display is activated, e.g. at a one meter distance from the user device  204  in front of the user device  204 . According to an example, when the augmented reality display is pointing to floor the augmented reality display may still be the predefined distance from the user device  204  to the predefined direction, e.g. one meter from the user device  204  in front of the user device  204  somewhere above the floor. An augmented reality display being relative to spatial direction means that the augmented reality display may be floating in a predefined physical location, when the augmented reality display is activated, irrespective location of the user of the user device  204 . In other words, the augmented reality display may be floating in a corner of a floor irrespective of a direction from which the user of the user device  204  is looking at the augmented reality display. The visual output  410  implemented with augmented reality may be operated on site, i.e. the user device  204  (and the user of the user device  204 ) may be in a vicinity of the people transport system  100  or the access control system  120  when operating the maintenance interface device implemented with augmented reality, or remotely, i.e. the user device  204  does not need to be in vicinity of the people transport system  100  or the access control system  120 , when operating the maintenance interface device implemented with augmented reality. 
     In the virtual reality the visual output  410  representing the received maintenance related information, e.g. virtual reality display, i.e. virtual reality interface, may be arranged to replace a real-world environment with a virtual environment. Otherwise, the virtual reality operates as the augmented reality described above. The visual output  410  implemented with virtual reality may be operated on site. Preferably, the visual output  410  implemented with virtual reality may be operated remotely. 
     In the mixed reality real-world objects may be dynamically integrated into virtual world to produce new environments and visualizations, where physical and digital objects, such as the visual output representing the received maintenance related information, e.g. a mixed reality display, i.e. mixed reality interface, may co-exist and interact in real time. Otherwise, the mixed reality operates as the augmented reality described above. The visual output  410  implemented with mixed reality may be operated on site or remotely. 
       FIGS. 4A to 4C  illustrate example embodiments of system according to the present invention.  FIG. 4A  illustrates an example embodiment, wherein the user device  204 , i.e. smart glasses in this example, is arranged to provide the visual output  410  representing maintenance related information, which is received from the storage unit  202  in response to detecting the activation event. For sake of clarity the user of the user device  204 , equipped with, i.e. wearing, the user device  204  is not illustrated in  FIG. 4A . The provided visual output  410  in the example of  FIG. 4A  is augmented reality display, but the provided visual output  410  may alternatively be virtual reality display or mixed reality display. The augmented reality display of the example of  FIG. 4A  is see-through augmented reality display, but the augmented reality display may alternatively be projected augmented reality display. The provided visual output  410 , i.e. the displayed received maintenance related information, may comprise one or more elements  412   a - 412   n  each being associated with at least one piece of the received maintenance related information. In other words, each element  412   a - 412   n  may represent at least one piece of the received maintenance related information. Some of the elements  412   a - 412   n  may be associated with at least one piece of the received maintenance related information enabling providing output information to the user, e.g. the elements  412   a - 412   c  in the example of  FIG. 4A . Some of the elements  412   a - 412   n  may be associated with at least one piece of the received maintenance related information enabling interactive operations to receive, i.e. detect, user indication from the user, e.g. the elements  412   d - 412   n  in the example of  FIG. 4A . The provided visual output  410  and/or the elements  412   a - 412   c  of the visual output  410  may comprise, but not limited to, text, words, tables, graphs, buttons, gauges, switches such as slider switches, rotating wheels, light indicators, images, video images, and/or animations, etc. The size of the provided visual output  410  may be scalable according to displayed content, e.g. number or displayed elements  412   a - 412   n.    
       FIG. 4B  illustrates another example, wherein the user device  204 , i.e. mobile phone in this example, is arranged to display on the display of the user device  204 , e.g. touchscreen of the mobile phone, the visual output  410  representing maintenance related information, which is received from the storage unit  202  in response to detecting the activation event. In the example of  FIG. 4B , the visual output  410  displayed on the display of the mobile phone  204  comprises elements  412   a ,  412   c  being associated with at least one piece of the received maintenance related information enabling providing output information and element  412   d  being associated with at least one piece of the received maintenance related information enabling interactive operations causing that the visual output  410  may be capable to provide output to the user and/or to receive user indication from the user.  FIG. 4C  illustrates another example, wherein the user device  204 , i.e. smart watch in this example, is arranged to display on the display of the user device  204 , e.g. a screen of the smart watch, the visual output  410  representing maintenance related information, which is received from the storage unit  202  in response to detecting the activation event. In the example of  FIG. 4C , the visual output  410  displayed on the display of the smart watch  204  comprises only elements  412   a ,  412   c  being associated with at least one piece of the received maintenance related information enabling providing output information causing that the visual output  410  may be capable only to provide output information to the user, but not receive any user indication from the user. 
     The part of the maintenance related information received by the user device  204  in the step  320  from the storage unit  202  may depend on an access level assigned for the user device  204 . The user device  204  may be capable to have different access levels indicating different level access rights for the user of the user device  204 . Different amount of the maintenance related information and/or content of the maintenance related information may be received from the storage unit  202  for each access level assigned for the user device  204 . The access level may be device specific and/or user specific. Device specific access level means that each user device  204  may have a specific access level irrespective of the user of the user device  204 . The user specific access level means that each user may have a specific access level. This enables that the same user device  204  may have different access levels for different users of the user device  204 . According to an example, unauthorized user, an operator of the people transport system  100  or the access control system  100 , and a maintenance personnel may each have different access level for the user device  204  causing that different amount and/or content of the maintenance related information may be received from the storage unit  202  for each access level.  FIGS. 5A-5C  illustrate non-limiting example views of the provided visual output  410  with different amount and/or content of the maintenance related information received by the user device  204  from the storage unit  202  depending on the access level assigned for the user device  204 .  FIG. 5A  illustrates an example view of the visual output  410  provided for an unauthorized person having a first access level, e.g. a lowest access level, for which no maintenance related information can be received at all causing that the provided visual output  410  comprises an empty display.  FIG. 5B  illustrates an example view of visual output  410  provided for the maintenance personnel having a second access level, e.g. an intermediate access level, for which a first part of the stored maintenance related information may be received causing that the provided visual output  410  represents the first part of the stored maintenance related information.  FIG. 5C  illustrates an example view of visual output provided for the operator having a third access level, e.g. a highest access level, for which a second part of the stored maintenance related information may be received causing that that the provided visual output  410  represents the second part of the stored maintenance related information. The second part of the stored maintenance related information may be at least partly different from the first part of the stored maintenance related information. For example, the visual output  410  provided for the operator may comprise information relating to one or more operations of the people transport system  100  or the access control system  120  and the visual output  410  provided for the maintenance personnel may comprise information relating to one or more operational parameters of the people transport system  100  or the access control system  120 . The different access levels may also enable personalizing of the visual output  410 , e.g. appearance or layout. The personalization may comprise e.g. personalized language, personalized location or layout of one or more elements  412   a - 412   n  of the visual output  410 . Alternatively or in addition, the part of the maintenance related information received by the user device  204  in the step  320  from the storage unit  202  may be adapted or adjusted at any time in order to improve the adaptability of the visual output  410 . According to a non-limiting example, if some further maintenance related information is stored into the storage unit  202 , the part of the maintenance related information received by the user device  204  in the step  320  from the storage unit  202  may be adapted to include the further maintenance related information. 
     Next, at least some further aspects of the present invention may be described by referring to  FIG. 6  in which a method according to an embodiment of the present invention is schematically illustrated. 
     In the step  610 , a user indication may be detected, i.e. received. The user device  204  may comprise user one or more input devices, such as touchscreens, keypad, keyboard, buttons, microphones, and/or one or more sensor devices, such as imaging devices, e.g. cameras, accelerometers, gyroscopes, compasses, and/or any other sensor devices capable to detect movement, for detecting the user indication. The user indication detectable with the one or more input devices and/or the one or more sensor device of the user device  204  may comprise at least one of the following: gesture, gaze, voice, touch. 
     The touch-based user indication may be detected for example by a touchscreen or touch-based buttons of the user device  204 . The visual output  410  may be displayed at least partly, e.g. one or more elements  412   a - 412   n  being associated with at least one piece of the received maintenance related information enabling interactive operations, on the touchscreen and/or touch-based buttons arranged to detect the touch-based user indication. For example, in the example of  FIG. 4B  the visual output  410  may be displayed on the touchscreen of the mobile phone  402  and the element  412   d  may enable interactive operations with the user to detect, i.e. receive, the user indication, e.g. one or more touches with a finger or any other pointer. The voice-based user indication may be detected by one or more microphones of the user device  204 . The gaze-based user indication may be detected by one or more sensor devices, such as cameras, of the user device  204 . 
     The gesture-based, i.e. motion-based, user indication may be detected by one or more sensor devices of the user device  204 , such as cameras, accelerometers, gyroscopes, compasses, and any other sensor devices capable to detect movement. Alternatively, the gesture-based user indication may be detected by one or more sensor devices arranged in a peripheral device such as a pointer, a glove or other wearable accessory. The detected gestures, e.g. gestures of a hand of the user, may mimic physical user interaction with a physical input device. According to a non-limiting example, if the visual output  401  comprises one or more elements  412   a - 412   n  being associated with at least one piece of the received maintenance related information enabling interactive operations to receive user indication, e.g. an element  412   a - 412   n  representing a switch, button or keypad, e.g. the slide switch  412   n  of the example in  FIG. 4A , the detected user indication may be a detection of slide type gesture of the hand of the user at a location of said element  412   a - 412   n , which mimics the sliding of a physical slide switch by the hand of the user. Similarly, in case of element  412   a - 41   n  representing any other type switch, keypad, or button, the detected user indication may be a detection of gesture of the hand of the user at a location of said element  412   a - 412   n , which mimics the gesture of the hand of the user using the corresponding physical input device. 
     In the step  620 , the user device  204 , may generate at least one control signal to the control unit  110 a of the people transport system  100  for controlling one or more operations of the people transport system  100  and/or one or more operational parameters of the people transport system  100  associated with the detected user indication. In response to receiving the at least one control signal from the user device  204 , the control unit  110   a  of the people transport system  100  is arranged to control the operation of the people transport system  100  according to the at least one control signal and/or to control, i.e. adjust, one or more operational parameters of the people transport system  100  according to the at least one control signal. Alternatively, the user device  204 , may generate at least one control signal to the control unit  110   b  of the access control system  120  for controlling one or more operations of the access control system  120  and/or one or more operational parameters of the access control system  120  associated with the detected user indication. In response to receiving the at least one control signal from the user device  204 , the control unit  110   b  of the access control system  120  is arranged to control the operation of the access control system  120  according to the at least one control signal and/or to control, i.e. adjust, one or more operational parameters of the access control system  120  according to the at least one control signal. The at least one control signal may comprise instructions to perform one or more maintenance, test, inspection and/or emergency operations or any other operations corresponding to operations that may be provided with the physical maintenance interface device  116  of the people transport system  100  or the access control system  120 . The at least one control signal may further comprise for example, but not limited to, one or more of the following: maintenance related reporting, such as performed maintenance operations, spare part orders, recommendation(s) for next visit; video or voice calls to an external unit, e.g. support organization; etc. 
       FIG. 7  schematically illustrates a used device  204  according to an embodiment of the invention. The user device  204  may comprise a processing unit  710 , a memory unit  720 , a communication interface  730 , a user interface  740 , and one or more sensor devices  750  among other entities. The processing unit  710 , in turn, may comprise one or more processors arranged to implement one or more tasks for implementing at least part of the method steps as described. For example, the processing unit  710  may be arranged process the received maintenance related information to generate a display on or with the user device  204  to display the received maintenance related information to the user in the manner as described. The memory unit  720  may be arranged to store computer program code  725  which, when executed by the processing unit  310 , cause the user device  204  to operate as described. Moreover, the memory unit  720  may be arranged to store, as described, received maintenance related information, and any other data. The communication interface  730  may be arranged to implement, e.g. under control of the processing unit  710 , one or more communication protocols enabling the communication with external entities as described. The communication interface  730  may comprise necessary hardware and software components for enabling e.g. wireless communication and/or communication in a wired manner. The user interface  740  may comprise one or more input/output devices, such as buttons, keyboard, touchscreen, microphone, loudspeaker, display and so on, for receiving input from a user and outputting information to a user. The one or more sensor devices  750  may comprise the one or more sensor devices for detecting the user indication as described, and/or any other sensor devices. 
     The specific examples provided in the description given above should not be construed as limiting the applicability and/or the interpretation of the appended claims. Lists and groups of examples provided in the description given above are not exhaustive unless otherwise explicitly stated.