MCX4D Operating Manual.doc
2018-07-20
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controller but also doors are supplied from the expander. If the controller is supplied from transformer and is
equipped with own battery then controller
’s ground (AUX- terminal) must be connected with expander’s
ground (VOUT- terminal) using any wire.
Fig. 6 Connection diagram for expander and MC16 controller
Connection of multiple expanders to controller
In the figure below an example of system including multidoor MC16 access controller and three MCX4D
expanders is presented. In general perspective the maximal number of expanders connected to the
controller equals the number of unoccupied addresses on RS485 bus. Each MCX4D can be equipped with
own battery and be supplied from its own PSU. It is also possible to use single 13.8 VDC PSU to supply two
or more expanders. In the example below the controller is supplied from one of expanders.
