Error Responses - GE DGP Instruction Manual

9 COMMUNICATIONS
9.4 MODBUS ERRORS
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
Field:
SLAVE ADDRESS
FUNCTION CODE
Exception Code
CRC
The DGP will implement the following exception response codes.
01: Illegal function
02: Illegal Data Value
03: Illegal Data Address
GE Power Management
Bytes Example (hex):
1 11 Message from slave 17
1 Function ID with MSbit set to 1
1 Exception Code
2 CRC Calculated by Slave High byte first. Low byte next
DGP Digital Generator Protection System
9.4 MODBUS ERRORS

9.4.1 ERROR RESPONSES

9-
9
11