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Unable to find Modbus device on RS-485 line under an Automation Server.

Issue

Unable to find Modbus device on RS-485 line under an Automation Server.

Environment

Automation Server (AS)

Modbus over serial line

Cause

Common wire is missing.

Resolution

Connect a common wire to the Shield connection on the COM port terminal

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Version history
Revision #:
1 of 1
Last update:
‎2018-09-06 09:51 AM
Updated by: