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8. Modbus function code overview
The supported function codes are shown in the table below:
Type
16-bit data (registers)
Diagnostics
Reading or writing coils is not supported.
The same data are available in both holding registers and input
registers, meaning that either function (0x03 or 0x04) can be
used for reading data.
Code
Hex
Name
03
0x03
Read holding registers
04
0x04
Read input registers
06
0x06
Write single register
16
0x10
Write multiple registers
Diagnostics
08
08
See section
for subcodes.
13.6 Diagnostics, 0x08
15
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