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4 Modbus Communications Procedure
4-2
Function List
The following table lists the function codes.
Function Code List
Function code
03 (H'03)
16 (H'10)
06 (H'06)
08 (H'08)
4 - 6
Name
Read variable
This function reads from the variable area.
(multiple)
It is possible to read two or more consecutive variables.
Write variable
This function writes to the variable area.
(multiple)
It is possible to write two or more consecutive variables.
It is also possible to broadcast this function (broadcast
transmission).
Write variable
This function writes to the variable area and writes operation
(Single/operation
commands.
command)
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.)
Echoback Test
This function performs an echoback test.
E5@D Digital Temperature Controllers Communications Manual (H225)
Process
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