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4.2 Pin assignment
The transmission line must be terminated at the last receiver of the Modbus transmission line with
a 120 Ohm / 0.25 W resistor. This resistor must be inserted directly between the two signal lines
before the input of the last device.
Only shielded and twisted cables should be used for Modbus.
Connection Icon
Description
1
-
Ground connection for supply voltage
2
-
Ground connection for supply voltage
3
+
Positive connection for supply voltage 12 ... 24 V
⎓
4
-
Ground connection for Modbus (connected to connection 1 and connection 2)
5
A
Data line A (+) for Modbus
6
B
Data line B (-) for Modbus
KNX
+
Positive connection for KNX bus
KNX
-
Ground connection for KNX bus