CMDN Manual 15
[CMDN-011.CDR]
CMDN(-C) Flush Mount Enclosure
IRC-3 and FCC Field Wiring
The total length of the RS-485 communications loop used to connect
multiple annunciators cannot exceed 7,700 feet (2348 m). Wire
annunciators per the following figures.
Annunciator IRC-3 and FCC Terminal Connections
Terminal Function
1 + 24 Vdc
2 24 Vdc Common
3 Earth Ground
4 RS-232, Rx In
5 RS-232, Tx Out
6 RS-232, Common
7 RS-485, Ch 0 (+)
8 RS-485, Ch 0 (-)
9 RS-485, Ch 1 (+)
10 RS-485, Ch 1 (-)
Note: For Style 4 (Class B) wiring, use only RS-485 Channel 0. For
Style 7 (Class A) wiring, use both RS-485 channels.
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