This section explains the sending and receiving of messages through the use of the TCP/IP communication function.

Note

By using the TCP/IP communication function, you can communicate with MHPs. In this section, the remote system you communicate with is referred to as MHP. However, you can also freely select remote systems other than MHPs.

There are three types of message transmission by the TCP/IP communication function:

• Send-only messages from the CUP to the MHP
• Receive-only messages from the MHP to the CUP
• Send and receive messages between the MHP and the CUP

When a message is sent or received, automatic addition of the message length or confirmation of message delivery can be specified.

Organization of this section

2.5.1 Send-only messages

2.5.2 Receive-only messages

2.5.3 Sending and receiving messages

2.5.4 Message assembly facility and delivery confirmation facility

2.5.5 Notes on using the TCP/IP communication facility