Nortel Networks VT100 manual TRS communication process

About the VT100 Gateway 1-5

A Meridian IVR 2.0/I process called the Terminal Resource Server (TRS) controls all VT100 sessions, as well as manages all host connections. The TRS runs as a stand-alone process within the Meridian IVR 2.0/I architecture, and starts when Meridian IVR 2.0/I is started. To use the TRS, place a COMI cell in the Meridian IVR 2.0/I call flow at the point where you need to establish a host connection. The COMI cell sends requests for information to the TRS process, which then passes them on to the host. A COMO cell retrieves the information sent to the TRS process by the host, and then ends the transaction. A COMA cell aborts the host transaction in the case of a hang-up or an error. This process is shown in Figure 1-4.

Figure 1-4

TRS communication process

		START		Cleanup
				Handler
		ANSW			COMA
		GDAT
Host
		MENU
	Input	1		2
	Buffers
		COMI	COMI
TRS		COMO	COMO
process
	Output
	Buffers	PDAT	PDAT
		HANG

The TRS process uses template files (described in Chapter 2) to control the communication process between the Meridian IVR 2.0/I application and the host computer.

As illustrated in Figure 1-4, the TRS uses the data passed to it by the input buffer as a signal to establish a terminal session. The TRS then controls the screen display on the host computer.

Meridian IVR VT100 Gateway Development Guide Product release 2.0/I