Manual Structure - Omron V780 Series User Manual

Manual Structure

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The following page structure is used in this manual.
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Level 3 heading
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Indicates a procedure.
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precautions, additional
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reference information.
Manual name
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UHF RFID System V780-series Reader/Writer User's Manual (Z389)
7-4 Communications Procedure
In the computer, PLC, or other host devices, write the program to communicate with the Reader/Writer
using TCP sockets.
If you use an Modbus/TCP master device, follow the communications procedure for the device you are using.
7-4-1 Command Communications Procedure
A connection is required between the host device and Reader/Writer to communicate with the
Reader/Writer. After you establish a connection, send commands and receive the responses.
1
Connection Processing: Opening a Socket
Send a request for a connection from the host device to the Rea der/Writer and establish a TCP
connection. Monitor for connection timeouts as required.
2
Command Send Processing: Sending Socket Data
Send the command from the host device to the Reader/Writer in a message.
Monitor for send timeouts as required.
3
Response Reception Processing: Receiving Socket Data
At the host device, wait to receive the message from the host device and receive the response.
Monitor for reception timeouts as required.
4
Disconnection Processing: Closing the Socket
Send a request for a disconnection from the host device to the Reader/Writer and disconnect
the TCP connection. Monitor for disconnection timeouts as required.
Host device Reader/Writer
(client) (server)
Connection requested.
Connection request acknowledged.
Command sent.
Response returned.
Disconnection requested.
Disconnection request acknowledged.
Precautions for Correct Use
Access to a Reader/Writer is possible from only one host device at a time.
If a host device B connects to a Reader/Writer while another host device A is already con-
nected to it, the connection between host device A and the Reader/Writer will be automatically
disconnected and a connection with host device B will be established.
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
7 Modbus/TCP Communications
7
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Manual Structure
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