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Table 1
Accessory Connector Pin Assignments
Following are the pin assignments for the Accessory Connector:
15-Pin-D
Signal Function
pin 1
Set Point #1 relay, normally closed
pin 2
Set Point #1 relay, common
pin 3
Set Point #1 relay, normally open
pin 4
Set Point #2 relay, normally closed
pin 5
Set Point #2 relay, common
pin 6
Set Point #2 relay, normally open
pin 7
Tx, RS-232 signal out of the 921, 9600-N-8-1
pin 8
Rx, RS-232 signal into the 921
pin 9
Ground, RS-232 and analog common
pin 10
no function
pin 11
no function
pin 12
no function
pin 13
Analog Output, 1Kohm, 0.5 volts per decade
pin 15
no function
pin 16
no function
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