GE Power Management
DGP Digital Generator Protection System
9-
11
9 COMMUNICATIONS
9.4 MODBUS ERRORS
9
9.4 MODBUS ERRORS
9.4.1 ERROR RESPONSES
When a DGP slave detects an error a response will be sent to the master. The MSBit of the function code will
be set to 1 and the following byte is an exception code.
The Slave response will be
The DGP will implement the following exception response codes.
01: Illegal function
02: Illegal Data Value
03: Illegal Data Address
Field:
Bytes
Example (hex):
SLAVE ADDRESS
1
11 Message from slave 17
FUNCTION CODE
1
Function ID with MSbit set to 1
Exception Code
1
Exception Code
CRC
2
CRC Calculated by Slave High byte first. Low byte next
Содержание DGP Series
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