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‘SIGNAL CONNECTOR’ in figure 4. Also indicated are the input signal’s positive and negative polarities
for thermocouple connection. These markings are also on the printed circuit board in front of the connector.
Care should be taken to connect the positive and negative legs of the signal source to the proper terminals on
the connector. A wrong connection will result in incorrect process readings. (No polarity is necessary for
RTD or thermistor).
OUTPUT CONNECTOR PIN ASSIGNMENT
Table 1 shows the output connector pin numbers and signal description. For convenience, the printed circuit
board is labeled R1 through R7. Additionally, positive and negative outputs for open collector outputs are
also indicated.
TABLE 1. Output Connector Pin Assignment
SCREW TERMINAL OUTPUT CONNECTOR
14
13
12
11
10
9
8
7 6
5
4 3 2 1
PIN NO DESCRIPTION
1
LIMIT 1 COMMON/OPEN COLLECTOR POSITIVE
2
LIMIT 1 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE
3
LIMIT 2 COMMON/OPEN COLLECTOR POSITIVE
4
LIMIT 2 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE
5
LIMIT 3 COMMON/OPEN COLLECTOR POSITIVE
6
LIMIT 3 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE
7
LIMIT 4 COMMON/OPEN COLLECTOR POSITIVE
8
LIMIT 4 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE
9
TIMER 1 COMMON/OPEN COLLECTOR POSITIVE
10
TIMER 1 NORMALLY OPEN/OPEN COLLECTOR NEGATIVE
11
TIMER 2 COMMON/OPEN COLLECTOR POSITIVE
12
TIMER 2 NORMALLY OPEN/OPEN COLLECTOR POSITIVE
13
DISPLAY HOLD SWITCH CONNECITON
14
DISPLAY HOLD SWITCH CONNECTION
NOTE: Pins on the connector other than those designated in table 1 must NEVER be connected to any
other signal under any circumstances. Also, proper connection and correct orientation of the connector are
necessary to avoid malfunction or permanent damage to the instrument.