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9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
78
PXR Electronic trip unit
01/21 MN012005EN
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9.3.14 Exception codes
If there is an error in the request or the response, the release will return an
exception code.
Table 41: Exception codes
Exception code
Reason
01
The function code in the query is not supported by the trip unit.
Note:
This exception code is also used for unsupported sub-function codes in Modbus diagnostics.
02
The requested data register or bit address is not supported.
03
The data in the query are not supported.
04
The trip unit does not support this query or only part of a register is used in the query.
05
ACK = acknowledged
06
The trip unit is unable to execute the current request at this time.
07
NAK = not acknowledged
The trip unit is unable to execute the request.
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