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What are the meaning of communication errors on HMIVU series operator interfaces?

When there is a communication error  on  HMIVUs, an error code will be displayed on the screen. As an example,  Error Code 3.  Com 1, Station 2.

The meaning of those error codes can be seen below:

02 - Unknown

03 - NoResponse

04- HMICheckSumError

05 - ControllerCheckSumError

06 - CommandError

07 - AddressError

08 - ValueError

09 - ControllerBusy

0A - NoCTS

0B - NoResource

0C - NoService

0D - MustRetry

0E - HMIStationNumberError

0F - PLCStationNumberError

10 - UARTCommunicateFail

11 - NOTExecutableInRunMode

3F - OtherError