MCX402DR Operating Manual.doc
2018-09-03
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Fig. 2 MCX402DR-BRD application in single read-in/out door control (A) and two read-in doors control (B)
Power supply and backup battery
MCX402DR-BRD expander is designed for power supply from 230VAC/18VAC/40VA transformer and then
it offers 13.8VDC power outputs (AUX, TML) for external devices. Optionally the expander can be supplied
from 12VDC or 24VDC but in case of 12VDC the backup battery cannot be directly connected to the
expander thus the emergency power supply must be provided by external PSU.
Note: Expander cannot be started using only power supply from backup battery.
Fig. 3 MCX402DR-BRD supply from 18VAC
