TREBING + HIMSTEDT SPI 3, Руководство пользователя

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Appendix
40
Trebing & Himstedt | SPI 3 | MODBUS RTU
Function 16: Preset Multiple Regs
Response with error code (Exception Response)
If the MODBUS slave generates an exception code, the MS bit in byte 2 is set to 1.
The exception code is used to indicate the following errors:
0x01 Invalid MODBUS function
0x02 Invalid MODBUS address
0x03 Invalid MODBUS data value
0x04 Slave device faulty
0x05 Acknowledge, slave cannot process data immediately
0x06 Slave busy, repeat the service later
Request to the slave Slave response
Byte Contents Hex code (e.g.) Contents Hex code (e.g.)
Byte 1 Slave Address 11 Slave Address 11
Byte 2 Function 10 Function 10
Byte 3 Starting Address High 00 Starting Address High 00
Byte 4 Starting Address Low 01 Starting Address Low 01
Byte 5 No. of Registers High 00 No. of Registers High 00
Byte 6 No. of Registers Low 02 No. of Registers Low 02
Byte 7 Byte Count 04 – –
Byte 8 Data High 00 – –
Byte 9 Data Low 0A – –
Byte 10 Data High 01 – –
Byte 11 Data Low 02 – –
Request to the slave Slave response
Byte Contents Hex code (e.g.) Contents Hex code (e.g.)
Byte 1 Slave Address 0A Slave Address 0A
Byte 2 Function 01 Function 81
Byte 3 Starting Address High 04 Exception code 02
Byte 4 Starting Address Low A1 – –
Byte 5 No. of Coils High 00 – –
Byte 6 No. of Coils Low 01 – –