Sierra Monitor Corporation 5100-06-IT - Manual (Page 15)

Model 5100-XX-IT Toxic Gas Sensor Module
Page: 11
P2 PCB Label Function
1
RS 485
+ RS 485 (+) (A)
2 - RS 485 (-) (B)
3 S RS 485 shield (Isolated GND)
4
RS 485
+ RS 485 (+) (A)
5 - RS 485 (-) (B)
6 S RS 485 shield (Isolated GND)
P3B PCB Label Function
1 P VDC Power
2 S Sentry Signal or Communication
3 G VDC Ground
P3A
4 P VDC Power
5 S Sentry Signal or Communication
6 G VDC Ground
P4 Connections are only available when the optional Relays are included
P4 PCB Label Function
1
WARNING
N/C Low Alarm Relay NC
2 COM Low Alarm Relay COM
3 N/O Low Alarm Relay NO
4
ALARM
N/C High Alarm Relay NC
5 COM High Alarm Relay COM
6 N/O High Alarm Relay NO
7
TRBL
N/C Trouble Alarm Relay NC *
8 COM Trouble Alarm Relay COM*
9 N/O Trouble Alarm Relay NO*
* Trouble relay is fail safe so it is energized for normal operation,
functions are labeled for normal operation.
8. Establish the module address according to section 4.5.
NOTES
The starting delay period normally takes approximately 3 minutes but under some
circumstances can take longer.
For optimum performance, it is recommended that a calibration be performed after 24 hours of
operation.