An apparatus for use in a reduced-pressure treatment system, the apparatus comprising a control unit and a component module, the control unit comprising: a housing; a communication controller disposed in the housing; characterised by an extension coupled to the housing and having an end surface, the extension engaging with the component module; and a controller area network port coupled to the communication controller and exposed through a first aperture in the end surface; a first ridge located on the end surface; and a second ridge located on the end surface opposite the first ridge; and further characterised by the component module comprising: a module housing having a rim, a recessed end surface, and an extension; a mounting assembly fixed to the recessed end surface, the mounting assembly comprising: a first latch positioned in a first notch, and a second latch positioned in a second notch, wherein the first latch and the second latch each comprise a fastener bar that is substantially flush with the rim when the first latch and the second latch are not extended, wherein the fastener bar of the first latch overlaps the first ridge and the fastener bar of the second latch overlaps the second ridge to secure the component module to the control unit; a control system contained within the module housing, the control system having a module communication controller configured to communicate with the communication controller of the control unit; a CAN plug coupled to the module communication controller and extending through a first aperture in the recessed end surface and interfacing with the CAN port; and a communication port coupled to the module communication controller and exposed to a second aperture extending through the extension. a housing; a communication controller disposed in the housing; characterised by an extension coupled to the housing and having an end surface, the extension engaging with the component module; and a controller area network port coupled to the communication controller and exposed through a first aperture in the end surface; a first ridge located on the end surface; and a second ridge located on the end surface opposite the first ridge; and further characterised by the component module comprising: a module housing having a rim, a recessed end surface, and an extension; a mounting assembly fixed to the recessed end surface, the mounting assembly comprising: a first latch positioned in a first notch, and a second latch positioned in a second notch, wherein the first latch and the second latch each comprise a fastener bar that is substantially flush with the rim when the first latch and the second latch are not extended, wherein the fastener bar of the first latch overlaps the first ridge and the fastener bar of the second latch overlaps the second ridge to secure the component module to the control unit; a control system contained within the module housing, the control system having a module communication controller configured to communicate with the communication controller of the control unit; a CAN plug coupled to the module communication controller and extending through a first aperture in the recessed end surface and interfacing with the CAN port; and a communication port coupled to the module communication controller and exposed to a second aperture extending through the extension. a module housing having a rim, a recessed end surface, and an extension; a mounting assembly fixed to the recessed end surface, the mounting assembly comprising: a first latch positioned in a first notch, and a second latch positioned in a second notch, wherein the first latch and the second latch each comprise a fastener bar that is substantially flush with the rim when the first latch and the second latch are not extended, wherein the fastener bar of the first latch overlaps the first ridge and the fastener bar of the second latch overlaps the second ridge to secure the component module to the control unit; a first latch positioned in a first notch, and a second latch positioned in a second notch, wherein the first latch and the second latch each comprise a fastener bar that is substantially flush with the rim when the first latch and the second latch are not extended, wherein the fastener bar of the first latch overlaps the first ridge and the fastener bar of the second latch overlaps the second ridge to secure the component module to the control unit; a control system contained within the module housing, the control system having a module communication controller configured to communicate with the communication controller of the control unit; a CAN plug coupled to the module communication controller and extending through a first aperture in the recessed end surface and interfacing with the CAN port; and a communication port coupled to the module communication controller and exposed to a second aperture extending through the extension.