Expansion port RS485/RS422
Wieland Electric GmbH | BA000917 | 08/2021 (Rev. C)
27
7.4
Expansion port connection RS422
Panel socket RJ45.
Pin
Signal
Description
Direction
1
SGND
Signal and supply ground
2
SGND
Signal and supply ground
3
RxD-
Receive data (-)
Output
4
RxD+
Receive data (+)
Output
5
TxD-
Transmit data (-)
Input
6
TxD-
Transmit data (+)
Input
7
+12 V EXT External power supply
8
+12 V EXT External power supply
Figure 22: RS422 port connector
Power supply is selected on the expansion port RS422 by means of a jumper.
If galvanic separation is required, the converter must have an external power supply.
Circuit example of the equipment with a router with data cable length less than 10 m
Figure 23: Circuit equipment with a router with data cable length less than 10 m
Circuit example of the equipment with a router with data cable length more than 10 m
Figure 24: Circuit equipment with a router with data cable length more than 10 m
With an RS422 data cable longer than 10 m it is necessary to use overvoltage protection on the
router side!
NOTICE
NOTICE
