Types Of Open Processing - Panasonic FP2 ET-LAN Technical Manual

6.1.2 Types of Open Processing

Open processing when using TCP/IP
Transmission Control Protocol (TCP) is a type of connection protocol in which it is necessary to open
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mutual connections between the source and partner nodes before communication processing can be
carried out.
There are three ways to open a connection, as described on the following page.
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With the ET-LAN unit, the method of opening the connection is specified by writing a value to the
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shared memory.
Open processing when using UDP/IP
User Datagram Protocol (UDP) is a protocol in which connections are not used. Data can be
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transferred simply by specifying the IP address of the partner node and the number of the port being
used, so no mutual connections need to be opened.
With the ET-LAN unit, however, open processing is necessary in order to specify the application, the
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number of the port being used, and the IP address.
Note:
If connections have been functionally opened for both the source and partner nodes (active connections
are open), or if the connections between the source and partner nodes are passively open (Fullpassive
open or Unpassive open), no connection is opened between the nodes when open processing is carried
out.
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