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C. MODBUS RTU REGISTER LISTING
03 (0x03) Read Holding Registers
This function code is used to read the contents of a contiguous block of holding registers in a remote device. The Request
Protocol Data Unit specifies the starting register address and the number of registers. In the Protocol Data unit Registers
are addressed starting at zero. Therefore registers numbered 1-16 are address as 0-15.
The register data in the response message are packed as to byte per register, with the binary contents right justified
within each byte. For each register, the first byte contains the high order bits and the second contains the low order
bits.
Modbus ID (Slave Address)
Modbus ID (Slave Address)
*N = Quantity of Registers
Modbus ID (Slave Address)
06 (0x06) Write Single Register
This function code is used to write a single holding register in a remote device. The Request Protocol Data Unit specifies
the address of the register to be written. Registers are addressed starting at zero. Therefore register number 1 is
addressed as 0. The normal response is an echo of the request, returned after the register contents have been written.
Modbus ID (Slave Address)
Modbus ID (Slave Address)
*N = Quantity of Registers
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