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What should customer check when unable to get the ModBus communications to work with his ATV28 drive?

Verify baud rate and address (Adr) in the drive. Confirm that the ModBus master is set up properly: baud rate and address must match the drive settings, modbus RTU, no parity, 8,1,1. Make sure you keep the message length on reads or writes to 7 words or less.
Verify wiring to the drive ModBus port. On drives manufactured before 9/2001 the pin outs are: D(B)=3, D(A)=5, 0V=2. On units manufactured after 9/2001: D(B)=4, D(A)=5, 0V=8.

CTA-ID : 10062
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