OpenTP1 Version 7 Programming Guide

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1.1.2 Application programs in message exchange mode

UAPs in message exchange mode enable communication between a host and a distributor which are connected through a protocol (e.g., OSI TP) that complies with the OSI, TCP/IP, and conventional networks.

The host and the distributor communicate with each other by sending and receiving messages. UAPs in message exchange mode are mainly used for communication with an own system which is in a wide area network (WAN) via a communication management program.

Coding formats are different between a UAP for message exchange processing and a UAP using the RPC in client/server mode. Unlike UAPs used for processing in client/server mode, once a UAP is created for message exchange processing, this UAP is used only to send and receive messages.

Nodes that use a UAP for message exchange processing must incorporate the OpenTP1 message exchange facility (TP1/Message Control, TP1/NET/Library), as well as products that support the appropriate communication protocol (TP1/NET/xxx)#.

#
Throughout this manual, the OpenTP1 message exchange facility (TP1/Message Control, TP1/NET/Library) and products supporting the appropriate communication protocol are referred to as Message Control Facility (MCF) or the MCF service.

The figure below shows how messages are sent and received in an OpenTP1 system.

Figure 1-3 Outline of message exchange processing

[Figure]