Function Code 05: Execute Operation; Function Code 06: Store Single Setpoint - GE 489 Instruction Manual

6 COMMUNICATIONS
Modbus Implementation: Force Single Coil
489 Implementation: Execute Operation
This function code allows the master to request specific 489 command operations. The command numbers listed in the
Commands area of the memory map correspond to operation code for function code 05. The operation commands can also
be initiated by writing to the Commands area of the memory map using function code 16. Refer to FUNCTION 16: STORE
MULTIPLE SETPOINTS for complete details.
Supported Operations: Reset 489 (operation code 1); Generator Start (operation code 2);
Generator Stop (operation code 3); Waveform Trigger (operation code 4)
MESSAGE FORMAT AND EXAMPLE
Reset 489 (operation code 1).
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
Modbus Implementation: Preset Single Register
489 Implementation: Store Single Setpoint
This command allows the master to store a single setpoint into the 489 memory. The slave response to this function code is
to echo the entire master transmission.
MESSAGE FORMAT AND EXAMPLE
Request slave 11 to store the value 01F4 in Setpoint address 1180. After the transmission in this example is complete, Set-
points address 1180 will contain the value 01F4.
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
DATA
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
DATA
CRC
GE Power Management
BYTES EXAMPLE (HEX):
1 0B message for slave 11
1 05 execute operation
2 00 01 reset command (operation code 1)
2 FF 00 perform function
2 DD 50 CRC calculated by the master
BYTES EXAMPLE (HEX):
1 0B response message from slave 11
1 05 execute operation
2 00 01 reset command (operation code 1)
2 FF 00 perform function
2 DD 50 CRC calculated by the slave
BYTES EXAMPLE (HEX):
1 0B message for slave 11
1 06 store single setpoint
2 11 80 setpoint address 1180
2 01 F4 data for address 1180
2 8D A3 CRC calculated by the master
EXAMPLE (HEX):
1 0B message for slave 11
1 06 store single setpoint
2 11 80 setpoint address 1180
2 01 F4 data for address 1180
2 8D A3 CRC calculated by the slave
489 Generator Management Relay
6.2 SUPPORTED MODBUS FUNCTIONS

6.2.3 FUNCTION CODE 05: EXECUTE OPERATION

6.2.4 FUNCTION CODE 06: STORE SINGLE SETPOINT

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