9
1-10. Modbus Function Code Read Input Registers
(0x04)
This function code is used to read from 1 to 125 contiguous input registers in a
remote device. The Request PDU specifies the starting register address and the
number of registers. In the PDU Registers are addressed starting at zero.
Therefore input registers numbered 1-16 are addressed as 0-15.
The register data in the response message are packed as two bytes 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.
Request Frame:
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