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Pelco Manual C544M (2/98) 11
3.3.1 Connecting the CM9760-IRC to a CM9760-CC1 Host
via Serial GPI
A CM9760-IRC can be daisy-chained from a serial GPI already connected to a
SerCom port of a CM9760-CC1 (CPU). The wiring is the same as for Section 3.3.
Connect the RS-422 OUT port of the serial GPI to the RS-422 IN port of the IRC
(refer to Figure 8).
Figure 8. Connecting IRCs in Sequence
3.4 CONNECTING ADDITIONAL IRCs IN SEQUENCE
Up to 16 IRC units can be daisy-chained from one port of the CM9760-CC1 host.
The RS-422 OUT port of the first IRC must be connected to the RS-422 IN port of
the next IRC in the chain (refer to Figure 8).
The data pin connections are shown below in Figure 9.
NOTE:
Sixteen is the maximum
number of racks that can be daisy-
chained from one port of the host
CPU.
Figure 9. Data Pin Connections for IRC’s in Sequence
CM9760-CC1
SERCOM
PORTS
(FEMALE)
(ANY
SERCOM
PORT)
PIN 3 = (BUSY +)
PIN 7 = (BUSY –)
PIN 4 = (RX+)
PIN 8 = (RX–)
PIN 5 = (TX+)
PIN 9 = (TX–)
PIN 3 = (BUSY +)
PIN 7 = (BUSY –)
PIN 4 = (TX+)
PIN 8 = (TX–)
PIN 5 = (RX+)
PIN 9 = (RX–)
CM9760-IRC
RS-422 DB9 PORT
(MALE)
IN
CM9760-IRC
RS-422 DB9 PORT
(FEMALE)
OUT
CONNECT
VIA CABLE