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What can cause connection in progress issue on HMI keypad VW3A1101 with ATV212 drive?

Issue:
What can cause connection in progress issue on HMI keypad VW3A1101 with ATV212 drive?

Product Line:
Altivar 212

Environment:
All 

Cause:

In most cases the issue is because the baud rate and parity settings of the HMI modbus has been altered.

Verify the following parameters using built in display.
F800=1 (Baud rate) 1= 19.2K
F801=1 (Parity) 1= Even parity
F802=1 (Address)
Also, the keypad Flash must be V1.1IE29 or higher.  

Power cycle once changes are made.

In other cases, a power supply issue where the +10V source PP and +24V source P24 may have issues or shorting.
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