GE 350

8-12 SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
FUNCTION CODE 10H CHAPTER 8: MODBUS FUNCTIONS
Table 8-8: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 10H
Query:
The query message specifies the register references to be preset. Registers are addressed
starting at zero: register 1 is addressed as 0.
The requested preset values are specified in the query data field. Data is packed as two
bytes per register.
Here is an example of a request to preset two registers starting at 43851 to 00 01 and 00
00 hex, in slave device 254:
Response:
The normal response returns the slave address, function code, starting address, and
quantity of registers preset.
MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message for slave 17
FUNCTION CODE 1 10 store setpoints
DATA STARTING ADDRESS 2 04 5C setpoint address 04
5C
NUMBER OF SETPOINTS 2 00 02 2 setpoints = 4 bytes
total
BYTE COUNT 1 04 4 bytes of data
DATA 1 2 00 02 data for setpoint
address 04 5C
DATA 2 2 01 F4 data for setpoint
address 04 5D
CRC 2 31 11 CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message from slave
17
FUNCTION CODE 1 10 store setpoints
DATA STARTING ADDRESS 2 04 5C setpoint address 04
5C
NUMBER OF SETPOINTS 2 00 02 2 setpoints
CRC 2 82 7A CRC error code
Field Name Hex
Slave Address FE
Function 10
Starting Address Hi 0F
Starting Address Lo 0A
No. of Registers Hi 00
No. of Registers Lo 02
Byte Count 04 04
Data Hi 00
Data Lo 01
Data Hi 00
Data Lo 00