Omron V780 Series, User Manual

Page: 156 / 398

7 Modbus/TCP Communications
7 - 4 UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
The expanded command that has a unique format defined by OMRON (FC100) cannot be sent with a
Modbus/TCP Class 0-compliant protocol. The TCP/IP socket communications of the host device (PLC)
are used instead.
Refer to 7-2 Message Formats on page 7-5 for details on the expanded communications commands.
Refer to 7-4 Communications Procedure on page 7-12 for information on creating a program for TCP/IP
communications.
Precautions for Correct Use
Communications Units and communications commands that support the Modbus/TCP protocol
support only function codes that comply with Modbus/TCP Class 0. Therefore, the function
code FC100 for expanded commands cannot be used.
You can set any IP address for the V780 Reader/Writer.
For details, refer to 7-6-5 Reader/Writer Setting Commands: Network Settings on page 7-57 or Setting
the IP Address of the Reader/Writer from a Web Browser on page 5-4.
Normally, port number 502 (01F6 hex) is used for Modbus/TCP communications.
With the V780 Reader/Writer, you can change the port number to between 1,024 and 65,535 (0400 hex
and FFFF hex).
For details, refer to 8-2-3 Network Settings on page 8-6.
Precautions for Correct Use
The slave reader/writer (V780-HMD68-ETN-

-S) can not change the Modbus/TCP port
number(502) from the default
TCP/IP Socket Communications System (FC03, FC16, and FC100)
IP Address Settings of the Reader/Writer
Port Numbers Used for Modbus/TCP Communications
Host device
(client)
Reader/Writer
(server)
Ethernet Cable
FC03, FC16, or FC100
TCP port number: 502
Command
Response
Power Supply Cable
Socket communications instructions
Ethernet Unit or other applicable Unit