Se nti
nel C X T
Sentinel CXT Instruction Manual
Rev. 1.7
Page 8 of 49
Cable to Sensor 1
Cable 1
Blue
Brown
Grey
Green/Yellow
Sensor Connection
Power - (GND)
Power + (PWR)
Unit Ground
mA
Wire #4
4-20mA
Wire #2
PWR
Wire #1
GND
Wire #3
*Unit Ground
Sensor
1
4-20mA
Wire #4
GND
Wire #1
PWR
Wire #2
Sensor Connector
*Unit Ground
Wire #3
1
PCB
Enclosure
1
2
3
4
Cable 2
Black
White
Red
Green
Wire
1
2
3
4
Unit Ground is Chassis Ground
Figure 5
Sensor Input Connector Pin-out
CAUTION
There are two possible styles of sensor cables used in the field for wiring the
sensor. It is very important to note which style of cable is being connected to the
sensor, and that the sensor is properly wired. Improper wiring of the sensor will
cause the sensor to be inoperative.
1.8 A la rm O utputs
The SmartWireless® CXT can optionally include one or two internal Relay PCAs for activating alarm
annunciators. Each Relay PCA includes four Class I Division 2 Groups A,B,C,D relays. If the
SmartWireless® CXT includes an attached strobe and/or horn, these devices are also activated by the Relay
PCA.
Each Relay PCA must have a unique Modbus address. The Relay PCA includes a single rotary switch to set
its Modbus address (Figure 6). The most significant digit of the address is hard-wired to “8”. The least
significant digit (LSD) is controlled by the rotary switch. The first Relay PCA should be addressed at 80h
and the second Relay PCA (if present) should be addressed at 81h.
Internal Alarm
Connections
Modbus
™
Connections
Alarm Relay Connections
Modbus
™
LSD Address
Figure 6
Relay PCA
