MCX402DR Operating Manual.doc
2018-09-03
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0.2A output is dedicated to supply readers. In the figure below a typical read-in/read-out door control
scenario with MCX402DR-BRD expander is presented. The door system is supplied from the expander and
it includes:
2 x PRT (RACS CLK/DTA) or 2 x Wiegand 26-66bit readers
12VDC door lock
12VDC alarm signalling device
Door contact
Exit button
Fig. 5 Typical scenario of operation for read-in/read-out door with PRT readers (A) and Wiegand readers (B)
Connection of expander to controller
The expander is not operated as standalone device but as an extension of MC16 access controller. It is
recommended to supply the MCX402DR-BRD from own transformer and equip it with backup battery. All
devices connected to the same RS485 bus should have GND terminals connected. Such connection can be
ensured with any wire. The maximal length of RS485 bus between MC16 controller and the expander
equals to 1200m. MCX402-BRD expander is usually installed near controlled door.
Fig. 6 Connection diagram for MC16 controller and expander
