Lucom ER 75i User Manual page 17

Circuit example of the equipment with a router with data length more than 10 m:
At RS485 data cable more than 10m it is need to use overvoltage protection
on the router side!
2.8.4.3.
Pin Signal
name
No.
1 SGND
2 SGND
3 RxD-
4 RxD+
5 TxD-
6 TxD+
7 +12V EXT External power supply
8 +12V EXT External power supply
ATTENTION! Power supply is selected on the expansion port RS422 by help
of a jumper, 2.9. If galvanic separation is required the converter must have an external
power supply.
17
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Expansion port RS422
Description
Signal and power supply ground
Signal and power supply ground
Receive Data (-)
Receive Data (+)
Transmit Data (-)
Transmit Data (+)
DESCRIPTION
Data flow
direction
Output
Output
Input
Input