Owner manual
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A1549
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POWER
SUPPLY
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RED
WHITE
NC
BLACK
SENSOR
GAS TRANSMITTER
+ –
RED
WHITE
NC
BLACK
SENSOR
GAS TRANSMITTER
RED
WHITE
NC
BLACK
SENSOR
GAS TRANSMITTER
22 AWG SHIELDED TWISTED PAIR
NOTES
1. WIRING TYPE
2.THREE MODULES SHOWN, 250 MODULES MAXIMUM.
3.SHIELD CONNECTED AT ONE END ONLY.
COMMUNICATION MODULE/DCU
GATEWAY
COMMUNICATION MODULE/DCU
COMMUNICATION MODULE/DCU
24 VDC POWER INPUT
NETWORK IN
NETWORK OUT
A
B
A
B
+
+
–
–
RELAY COMMON
+
–
4 TO 20 MA IN
IN 2
COM
IN 1
COM
NC
NO
DIGITAL INPUT 2
DIGITAL INPUT 1
RELAY
DETECTOR POWER
(24 VDC)
422 TXD
+
422 TXD –
CHASSIS GND
+
–
422 RXD +
422 RXD –
EXT RESET
COM
232 TXD
232 RXD
COM
A
B
A
B
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
NC
CHASSIS GND
K1
K2
K3
K4
FAULT
NET 0
NET 1
24 VDC
24 VDC POWER INPUT
NETWORK IN
NETWORK OUT
A
B
A
B
+
+
–
–
RELAY COMMON
+
–
4 TO 20 MA IN
IN 2
COM
IN 1
COM
NC
NO
DIGITAL INPUT 2
DIGITAL INPUT 1
RELAY
DETECTOR POWER
(24 VDC)
24 VDC POWER INPUT
NETWORK IN
NETWORK OUT
A
B
A
B
+
+
–
–
RELAY COMMON
+
–
4 TO 20 MA IN
IN 2
COM
IN 1
COM
NC
NO
DIGITAL INPUT 2
DIGITAL INPUT 1
RELAY
DETECTOR POWER
(24 VDC)
POWER
4 TO 20
+
–
POWER
4 TO 20
+
–
POWER
4 TO 20
+
–
Figure 20—A Typical Application – Communication Modules or DCUs with Combustible Gas Sensors and Transmitters