User Manual
Universal Serial/PROFIBUS DP Gateway
GT200-DP-RS
WWW.SSTCOMM.COM
52
High Byte
Low Byte
Command index Error code
The data values are defined as below.
High Byte Value
Description
0x00~0x2F
Index of command with correct response.
0x80~0xAF
Index of command with incorrect response.
The actual index is (N - 0x80).
Low Byte Value
Description
0x00
Response correct.
0xFF
Timeout.
Others
Modbus exception code. Please see
appropriate documentations.
Note:
1. The index counts beginning at the first command module under the exception codes module.
2. If the command responds error, the index of this command will add 0x80. For example, a command with
index 0x12 when responding correctly, has the index 0x92 (= 0x12 + 0x80) when it responds error.
3. The value keeps updating. Exception codes of different commands take turns displaying.
For example:
Add a “Exception Codes” module above some commands in slot 3. This exception modules only gives error codes
of the commands under slot 3 (from slot 4 to the end). If this exception codes gives value “01 00” “82 01” and
“8A FF”, which means that:
