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What is the meaning of Err 7 in Altivar 58.

Err 7 is a Time out error, the display has sent a request to the control board and does not receive answer
 
It indicates a defect of communication between the display and the control board

Possible Root cause:
 
1 - Bad immunity (cable too long, bad earth connection ..)
2 - The baud rate of the RS485 serial link has been changed.
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