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Chapter 2 Specification of Communication port for CPU module

2 – 17

TCP/IP protocols

When using TCP/IP to communicate, it is necessary to establish the connection between communication stations.

Otherwise, message data cannot be sent and received. In order to establish the connection, set one side to the TCP/IP

connection active open, and set the other side to the TCP/IP connection passive open.

Open a port of the TCP/IP connection passive open side, and then open a port of the TCP/IP connection active open

after the connection open stood by to open. After the connection established, data can be sent and received.

And in order to close the connection, close the port you want to close first.

Passive open

Active open

Active open side Passive open side

Connection establishment

Data sending and receiving

EHV-CPU Server

Active open

Connection open error

(Because the passive open side is

opened but it is not the stand by status.)

Connection close

Figure 2.18 Example of TCP/IP protocols

Reference

In order to open the port on the ASR communication port, turn on the ASR port open request flag of the control

Ex.) In case of ASR communication port 1: WRF601 = H0001

In order to close the port on the ASR communication port, turn off the ASR port open request flag of the control

Ex.) In case of ASR communication port 1: WRF601 = H0000

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RTS WM300 Especificaciones Pagina 31