Troubleshooting communication failure in Relay 2500, 3500, and 4500

Learn how to troubleshoot communication failure in Relay 2500, 3500, and 4500

Products affected: Relay™ 2500, Relay™ 3500, Relay™ 4500

Issue

Error opening COM or communication failure

Cause

Power cord not connected

Resolution

  • Verify the power cord is firmly connected and the wall socket is on
  • Turn the power switch on

UPDATED: 30 June 2021

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