GE 745 TRANSFORMER MANAGEMENT RELAY

8-8 745 Transformer Management Relay GE Power Management
8.2 MODBUS PROTOCOL 8 COMMUNICATIONS
8
8.2.11 FUNCTION CODE 06H: STORE SINGLE SETPOINT
Modbus Implementation: Preset Single Register
GE Power Management Implementation: Store Single Setpoint
This function code allows the master to modify the contents of a single setpoint register in the addressed slave
device. The response of the slave device to this function code is an echo of the entire master query message.
MESSAGE FORMAT AND EXAMPLE:
Request slave device 11 to write the value 00C8 at setpoint address 1100.
Master Query Message: Example (hex):
SLAVE ADDRESS 11 query message for slave 11
FUNCTION CODE 06 store single setpoint value
DATA STARTING ADDRESS: high order byte 11 data starting at address 1100
DATA STARTING ADDRESS: low order byte 00
DATA: high order byte 00 data for address 1100 = 00C*
DATA: low order byte C8
CRC: low order byte 8F
CRC: high order byte F0
Field: Example (hex):
SLAVE ADDRESS 11 response message from slave 11
FUNCTION CODE 06 store single setpoint value
DATA STARTING ADDRESS: high order byte 11 data starting at address 1100
DATA STARTING ADDRESS: low order byte 00
DATA: high order byte 00 data for address 1100 = 00C*
DATA: low order byte C8
CRC: low order byte 8F
CRC: high order byte F0