CONNECTING ADDITIONAL IRCs IN SEQUENCE, Pelco Manual C544M 2/98

3.3.1Connecting 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).

CM9760-CC1

SERCOM PORTS (FEMALE)

(ANY

SERCOM PORT)

3.4 CONNECTING ADDITIONAL IRCs IN SEQUENCE

NOTE: Sixteen is the maximum number of racks that can be daisy- chained from one port of the host CPU.

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.

CM9760-IRC

RS-422 DB9 PORT

(FEMALE)

OUT

CONNECT

VIA CABLE

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)

Figure 9. Data Pin Connections for IRC’s in Sequence

Pelco Manual C544M (2/98)