4 Modbus Communications Procedure
4 - 6
E5@C Digital Temperature Controllers Communications Manual (H175)
4-2 Function List
The following table lists the function codes.
Function Code List
Function code Name Process
03 (H'03) Read variable
(multiple)
This function reads from the variable area.
It is possible to read two or more consecutive variables.
16 (H'10) Write variable
(multiple)
This function writes to the variable area.
It is possible to write two or more consecutive variables.
It is also possible to broadcast this function (broadcast
transmission).
06 (H'06) Write variable
(Single/operation
command)
This function writes to the variable area and writes operation
commands.
It is also possible to write to a single parameter by specifying
the address in 2-byte mode. (This is not supported in 4-byte
mode.)
It is also possible to broadcast this function (broadcast
transmission.)
08 (H'08) Echoback Test This function performs an echoback test.
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