TREBING + HIMSTEDT SPI 3, Руководство пользователя

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Appendix
38
Trebing & Himstedt | SPI 3 | MODBUS RTU
Function 02: Read Input Status
Function 03: Read Holding Register
Function 04: Read Input Register
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 02 Function 02
Byte 3 Starting Address High 00 Byte Count 03
Byte 4 Starting Address Low C4 Data (Inputs 10204-10197) AC
Byte 5 No. of Points High 00 Data (Inputs 10212-10105) DB
Byte 6 No. of Points Low 16 Data (Inputs 10218-10113) 35
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 03 Function 03
Byte 3 Starting Address High 00 Byte Count 06
Byte 4 Starting Address Low 6B Data High (Register 40108) 02
Byte 5 No. of Points High 00 Data Low (Register 40108) 2B
Byte 6 No. of Points Low 03 Data High (Register 40109) 00
Byte 7 – – Data Low (Register 40109) 00
Byte 8 – – Data High (Register 40110) 00
Byte 9 – – Data Low (Register 40110) 64
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 04 Function 04
Byte 3 Starting Address High 00 Byte Count 02
Byte 4 Starting Address Low 08 Data High (Register 30009) 00
Byte 5 No. of Points High 00 Data Low (Register 30009) 0A
Byte 6 No. of Points Low 01 – –