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489 GENERATOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE
CG.2.3 Function Code 05: Execute Operation
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
Section CG.2.7 Function Code 16: Store Multiple Setpoints on page –8 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).
CG.2.4 Function Code 06: Store Single Setpoint
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.
CRC (low, high)
2
D5 17
computed CRC error code
Slave Response
Bytes
Example
Description
Slave Address
1
0B
message from slave 11
Function Code
1
03
read register values
Byte Count
1
04
2 registers = 4 bytes total
Data #1 (high, low)
2
00 64
value in address 0235h
Data #2 (high, low)
2
00 0A
value in address 0236h
CRC (low, high)
2
EB 91
computed CRC error code
Master Transmission
Bytes
Example
Description
Master Transmission
Bytes
Example
Description
Slave Address
1
0B
message for slave 11
Function Code
1
05
execute operation
Operation Code
2
00 01
reset command (op code 1)
Code Value
2
FF 00
perform function
CRC (low, high)
2
DD 50
computed CRC error code
Slave Response
Bytes
Example
Description
Slave Address
1
0B
message from slave 11
Function Code
1
05
execute operation
Operation Code
2
00 01
reset command (op code 1)
Code Value
2
FF 00
perform function
CRC (low, high)
2
DD 50
computed CRC error code
Содержание Multilin 489
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