Wiring Of Modbus Output Versions - Xtralis VESDA Sensepoint XCL Installation Manual

VESDA
Detector Source Mode with AC Power
24 VAC
4–20mA
R
L
Detector Sink Mode with AC Power
24 VAC
4–20mA
24V
DC
R
L
2.6

Wiring of Modbus Output Versions

Modbus Connection
For Modbus versions, up to 32 VESDA Sensepoint XCL detectors can be connected in a daisy chain
arrangement as shown in the diagram below.
Note: Where possible, spur or 'T' connections should be avoided. Always keep the spur connection as
short as possible.
Cable Specification for Modbus Connection
Type
Modbus
35563_02
VE+
1
VE−
2
1
COM
2
VE+
1
VE−
2
1
COM
2
Cable Spec
2 2
0.5 mm to 2.5 mm twist pair shied cable
VESDA Sensepoint XCL – Large Bore Installation Manual
Legend
1
VIN+
2
1
VIN−
2
3
4
4–20mA
3
COM
4
Legend
1
VIN+
1
2
VIN−
2
3
4–20mA
3
4
COM
4
External power supply
VESDA Sensepoint XCL
detector
System controller
Current flow
External power supply
VESDA Sensepoint XCL
detector
System controller
Current flow
Max Length
1000 m
11