User`s guide

EXPANSION PORT MOUNTING
15
2.10.4. Connection of the Port1 Connector – RS485
Panel socket RJ45.
Pin
number
Signal
mark
Description Data flow 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 TxRx+ RS485 A (+) Input/Output
7 +12 V EXT External power supply
8 +12 V EXT External power supply
ATTENTION! Power supply is selected on the expansion port RS485 by help
of a jumper, 2.11. 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:
Circuit example of the equipment with a router with data cable length more than 10 m:
With a RS485 data cable more than 10m it is necessary to use overvoltage protection
on the router side!