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

6.2 MODBUS FUNCTIONS
Modbus Implementation:
489 Implementation:
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 Section 6.2.7 Function
Code 16: Store Multiple Setpoints on page 6–6 for complete details.
Supported Operations:
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
6
Modbus Implementation:
489 Implementation:
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
6-4
Force Single Coil
Execute Operation
Reset 489 (operation code 1); Generator Start (operation code 2);
Generator Stop (operation code 3); Waveform Trigger (operation code 4)
BYTES EXAMPLE (HEX):
1 0B
1 05
2 00 01
2 FF 00
2 DD 50
BYTES EXAMPLE (HEX):
1 0B
1 05
2 00 01
2 FF 00
2 DD 50
Preset Single Register
Store Single Setpoint
BYTES EXAMPLE (HEX):
1 0B
1 06
2 11 80
2 01 F4
2 8D A3
EXAMPLE (HEX):
1 0B
1 06
2 11 80
2 01 F4
2 8D A3
489 Generator Management Relay

6.2.3 FUNCTION CODE 05: EXECUTE OPERATION

message for slave 11
execute operation
reset command (operation code 1)
perform function
CRC calculated by the master
response message from slave 11
execute operation
reset command (operation code 1)
perform function
CRC calculated by the slave

6.2.4 FUNCTION CODE 06: STORE SINGLE SETPOINT

message for slave 11
store single setpoint
setpoint address 1180
data for address 1180
CRC calculated by the master
message for slave 11
store single setpoint
setpoint address 1180
data for address 1180
CRC calculated by the slave
6 COMMUNICATIONS
GE Multilin