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Section 7 Modbus Communications Protocol
RFID System
User's Manual
(Modbus TCP)
Section 7
Host Communications Specifications
Modbus Communications Protocol
Communications between the host device and the Reader/Writer are performed on a client-server
basis. The computer, PLC, or other host device is the client and the Reader/Writer is the server.
Although you can change the setting of the IP address of the Reader Writer as required, port number
502 is always used for Modbus TCP communications.
Only one host can be connected to the Reader/Writer. If the Reader/Writer accept the request of connection from host-B while
host-A is connected to the Reader/Writer, the connection between the Reader/Writer and host-A will automatically disconnect
and the new connection with host-B will be established.
Client
(host device)
Server
(Reader/Writer)
Connection requested.
Connection request acknowledged.
Query sent.
Response sent.
Query sent.
Response sent.
Disconnection requested.
Disconnection request acknowledged.
Processing
executed.
Processing
executed.
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