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

Issue:   What should customer check when unable to get the ModBus communications to work with his ATV28 drive?
 
Product Line:   ATV28
 
Environment:  All
 
Cause:   Modbus not working
 
Resolution:   
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.




 
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