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G&R

Overview

G&R product architecture

The G&R products are built in a modular way, and designed to take advantage

of the multitasking capability of the Windows and UNIX/Linux platforms.

Thus a single instance of a product will in general consist of two or three quite

separate processes:

• A video handler: which maps all updates of the internal screen image

into the control sequences required to update the specific screen being

used. The video handlers are used by UNIX/Linux products, which must

communicate with various different terminal types. The Windows

products use the standard Windows graphical interface.

• A product: for example an emulator, which updates the internal screen

image to duplicate the terminal being emulated. The product will also in

general send and receive data to the host system using the global inter-

face, which applies to all communications protocols.

• A line handler: which maps the global communications interface into the

specific line protocol being used.

This structure has proven itself extremely efficient and very robust. We are able

to develop a video handler for a new screen type, and we know that once it

works with one G&R product it will work with all. We are able to develop a

new line handler and know that once it works with one product it will work

with all. We are able to develop a new product using a given screen and

communications protocol, and know that the product will work with all screen

types we support, and with all the communications protocols we support.

The server programs (e.g. Ggate, Gspool, GUFT) differ slightly from the

above model, as they don’t need a video handler, only a line handler. Pthru

doesn’t need a video handler either; it needs one line handler to connect to the

host and one line handler (TTY) to pass all presentation data through to the

terminal.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Installationshandbuch Seite 11