User`s guide

DESCRIPTION
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. Expansion port RS422
Pin
No.
Signal
name
Description
Data flow
direction
1 SGND Signal and power supply ground
2 SGND Signal and power supply ground
3 RxD- Receive Data (-) Output
4 RxD+ Receive Data (+) Output
5 TxD- Transmit Data (-) Input
6 TxD+ Transmit Data (+) Input
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.
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