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What is the remedy of Err7 at remote display terminal Altivar 28.

The Err 7 fault signal is a communication problem (RS485) between the control board and the display.

In order to troubleshoot this error check below points :
  1. Check the baud rate "bdr" is 19.2 (19200 baud)
  2. Check the wiring is done with the standard cable (3m).
  3. Check the cable and the connectors.
  4. Change the display
If it does not work, change the control card. Refer to attached file for cable wiring.
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