Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Set of Parameters on ASCII Terminal by Means of Echo Back

IP.com Disclosure Number: IPCOM000060577D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Kuroda, A: AUTHOR [+2]

Abstract

This article describes the way to avoid the unexpected command execution result that is caused by an unknown set of operational parameters by the operator. To avoid that, the host should be informed of the parameter changes. ASCII terminals are usually used in echo mode, as shown in Fig. 1. In the echo mode, the ASCII terminal can be seen to consist of two separated parts: keyboard and display. The keyboard just sends a code related to a depressed key. The display is the part that displays the character related to the received code and carries out the function related to the received code. In the echo mode, the code related to a depressed key is sent to the host without displaying the related character. The host receives the code and sends it back to the terminal (echo back).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 2

Set of Parameters on ASCII Terminal by Means of Echo Back

This article describes the way to avoid the unexpected command execution result that is caused by an unknown set of operational parameters by the operator. To avoid that, the host should be informed of the parameter changes. ASCII terminals are usually used in echo mode, as shown in Fig. 1. In the echo mode, the ASCII terminal can be seen to consist of two separated parts: keyboard and display. The keyboard just sends a code related to a depressed key. The display is the part that displays the character related to the received code and carries out the function related to the received code. In the echo mode, the code related to a depressed key is sent to the host without displaying the related character. The host receives the code and sends it back to the terminal (echo back). Then the terminal receives the code and displays the related character or carries out the function related to the received code. There is no direct path of codes from the keyboard to the display. The keyboard can send codes to the display only via the host. So it is only the host that can control the display and the terminal function. ASCII terminals usually have some operational parameters. They are, for example, communication protocols, screen size, character color, tab positions, programmable key-defined characters, and so on. They are set by an operator in a set-up mode or by a host by means of operational parameter set commands. The host usually sets the operational parameters to let the terminal carry out its expec...