Wiring

For Modbus communication the USH-9 is wired according to the table below.

Modbus

Connector MAIN

Connection wire

Description

Common

Pin 1

White

GND

D1 - B/B

Pin 4

Yellow

RS-485 A

D0 - A/A

Pin 5

Grey

RS-485 B

Table 21 Modbus wiring

NOTE  

Please note that different signal notations are in use for RS-485 connections:

TX+/RX+ or D+ or D1 as alternative for B

TX−/RX− or D− or D0 as alternative for A

NOTE  If the USH-9 is operated with multiple Modbus devices within the same network, termination resistors may be required. Please contact Sommer Messtechnik for details.