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7-1-2
Modbus/TCP Function Codes Supported by the V780
The Modbus/TCP function codes that are supported by the V780 Reader/Writer are given in the follow-
ing table.
Function code
FC03 and FC16
(normal commands)
FC100
(expanded command)
7-1-3
Communications System
There are two communications systems used by the V780 depending on the function codes that are
used.
Modbus/TCP Communications System (FC03 and FC16)
The communications system that uses normal commands that are compliant with Modbus/TCP Class 0
is shown below.
Refer to 7-2 Message Formats on page 7-5 for details on the normal commands.
Host device
FC03 or FC16
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
These function codes comply with Modbus/TCP Class 0.
The basic Modbus/TCP function codes are classified in Class 0.
Class 0 contains the following two functions: Read Multiple Resisters (FC03) and Write
Multiple Registers (FC16).
These are called normal commands in this manual.
This function code has a unique format that was defined by OMRON.
This function code is used to reduce command/response exchanges between the host
device and Reader/Writer and give priority to the performance of communications with
the host device.
This is called an expanded command in this manual.
Modbus/TCP communications instructions
Modbus/TCP Unit or other applicable Unit
(client)
Ethernet Cable
Command
Response
7 Modbus/TCP Communications
Description
Reader/Writer
(server)
Power Supply Cable
TCP port number: 502
7
7 - 3
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