Expansion port RS485/RS422
Wieland Electric GmbH | BA000917 | 08/2021 (Rev. C)
26
7.3
Expansion port connection RS485
Panel socket RJ45.
Pin
Signal
Description
Direction
1
GND
Signal and supply ground
2
GND
Signal and supply ground
3
TxRx-
RS485 B (-)
Input/Output
4
TxRx+
RS485 A (+)
Input/Output
5
TxRx-
RS485 B (-)
Input/Output
6
RXD-
RS485 A (+)
Input/Output
7
+12 V EXT External power supply
8
+12 V EXT External power supply
Figure 19: RS485 port connector
•
Power supply is selected on the expansion port RS485 by means of a jumper.
•
The signals 3 – 5 and 4 – 6 are linked inside of the router.
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 20: 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 21: Circuit equipment with a router with data cable length more than 10 m
With an RS485 data cable longer than 10 m it is necessary to use overvoltage protection on the
router side!
NOTICE
NOTICE
