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Model 5100-28-IT Combustible Gas Sensor Module
Page: 12
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
WARN
N/C Low Alarm Relay NC
2 COM Low Alarm Relay COM
3 N/O Low Alarm Relay NO
4
ALARM
N/C Hig*h 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.
Table 4 - 2: Sensor Module External Interfaces
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.
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