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ICP DAS, MDC-211-ZT user manual , v1.0 Page 41
Copyright © 2018 by ICP DAS. All rights are reserved.
The descriptions for the Read status:
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0: Indicates that the connection is in normal status.
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0xFFFF: Connection Timeout
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0xFF00: Command not enabled (Disabled)
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0x8XYY: Communication error. X-function code, YY– Error code, as Table 5.3 below
Table 5.3 Error code of the command status
Error Code Name
Description
01
Illegal Function
This function code is not supported
02
Illegal Data Address Illegal data address
03
Illegal Data Value
Illegal data value
04
Illegal Response
Length
The requested data length exceeds the allowable
length of the Modbus protocol.
0F
CRC Error
CRC error for the command response