Modbus Functions
Function Code 05: | Modbus Implementation: Force Single Coil |
Execute Operation | 489 Implementation: Execute Operation |
489
Communications Guide
Function Code 06: Store Single Setpoint
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 Function Code 16: Store Multiple Setpoints on page
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 | Bytes | Example | Description |
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Slave Address | 1 | 0B | message for slave 11 |
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Function Code | 1 | 05 | execute operation |
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Operation Code | 2 | 00 01 | reset command (op code 1) |
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Code Value | 2 | FF 00 | perform function |
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CRC (low, high) | 2 | DD 50 | computed CRC error code |
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Slave Response | Bytes | Example | Description |
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Slave Address | 1 | 0B | message from slave 11 |
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Function Code | 1 | 05 | execute operation |
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Operation Code | 2 | 00 01 | reset command (op code 1) |
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Code Value | 2 | FF 00 | perform function |
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CRC (low, high) | 2 | DD 50 | computed CRC error code |
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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, Setpoints address 1180 will contain the value 01F4.
Master Transmission | Bytes | Example | Description | |
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Slave Address | 1 | 0B | message for slave 11 | |
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Function Code | 1 | 06 | store single setpoint | |
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Data Starting Address | 2 | 11 80 | setpoint address 1180h | |
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Data | 2 | 01 | F4 | data for address 1180h |
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CRC (low, high) | 2 | 8D | A3 | computed CRC error code |
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Slave Response | Bytes | Example | Description | |
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Slave Address | 1 | 0B | message from slave 11 | |
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Function Code | 1 | 06 | store single setpoint | |
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Data Starting Address | 2 | 11 80 | setpoint address 1180h | |
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Data | 2 | 01 | F4 | data for address 1180h |
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CRC (low, high) | 2 | 8D | A3 | computed CRC error code |
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GE Multilin |
http://www.GEindustrial.com/multilin
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