7 Modbus/TCP Communications
7 - 2
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-1
Outline
• A V780 Reader/Writer can perform Modbus/TCP-compliant message communications with the host
device (PLC).
• Communications between the host device (PLC) and the V780 Reader/Writer are performed on a cli-
ent-server basis using the TCP/IP protocol. The computer, PLC, or other host device is the client and
the Reader/Writer is the server.
• The message that the host device (PLC) sends to the Reader/Writer is called a command. The mes-
sage that the Reader/Writer returns is called the response.
Precautions for Correct Use
The slave reader/writer (V780-HMD68-ETN-
-S) disconnects the connection when it sends
a communication command directly from the host device (client).
Use the slave reader/writer via the master reader/writer (V780-HMD68-ETN-
).
Additional Information
Modbus/TCP Protocol
The Modbus/TCP protocol is a communications protocol developed for PLCs by Modicon
Inc.(AEG Schneider Automation International S.A.S.). It is an open standard and has been
used for a variety of industrial devices.
A query in Modbus/TCP communications is called a command in this manual.
7-1-1
Modbus/TCP Communications
Host device
(client)
Reader/Writer
(server)
Ethernet Cable
TCP port number: 502
Command
Response
Power Supply Cable
Содержание V780 Series
Страница 22: ...Version Upgrade Information 20 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 60: ...3 Part Names and Functions 3 14 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 70: ...4 Installation and Connections 4 10 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 76: ...5 Preparations for Communications 5 6 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 152: ...6 Functions 6 76 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 334: ...8 Browser Interface 8 44 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 358: ...9 Troubleshooting 9 24 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 362: ...10 Maintenance and Inspection 10 4 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 392: ...Appendices A 30 UHF RFID System V780 series Reader Writer User s Manual Z389 ...
Страница 393: ...I 1 I UHF RFID System V780 series Reader Writer User s Manual Z389 Index ...
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