Browse Prior Art Database

COMPONENT CONTROL FOR BYTE INPUT

IP.com Disclosure Number: IPCOM000025633D
Original Publication Date: 1986-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

The purpose of this idea is to provide a Tech Rep with a means for isolating a circuit test failure occurring during self-test of a copying or reproduction machine. The self-test is usually performed by an input monitor circuit located on each machine remote, the circuit consisting of a reed relay under the control software, whose normally closed contacts apply logic ground to the returns of the machine d.c. input devices. In addition, there is usually other test circuitry which is also controlled by software for either pulling all external input signals to ground or forcing all inputs high through pull up resistors.

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 57% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

COMPONENT CONTROL FOR BYTE INPUT U.S. C1.340/825 Tuan A. Nguyen

Proposed Classification

Int. C1. H04q

The purpose of this idea is to provide a Tech Rep with a means for isolating a circuit test failure occurring during self-test of a copying or reproduction machine. The self-test is usually performed by an input monitor circuit located on each machine remote, the circuit consisting of a reed relay under the control software, whose normally closed contacts apply logic ground to the returns of the machine d.c. input devices. In addition, there is usually other test circuitry which is also controlled by software for either pulling all external input signals to ground or forcing all inputs high through pull up resistors.

The present control provides a byte-wide display enabling the Tech Rep to read the state of the whole input byte at once. As a result, only one input circuit test per remote is needed instead of the several required heretofore.

The display, for example, could employ three digits (i.e. digits 6. 7, and 8) to show the test number entered by the Tech Rep. Another digit ri (-1 digit 4) can be used to show a 'blank' for 'normal mode', or an 'H" (high) when all inputs are forced high ('forced high' mode), or an "L" (low) when all inputs are forced low ('forced low' mode). Another digit (i.e. digit 3) can be used to show the byte number, with other digits (i.e. digits 2 and 1) used to display, in hexadecimal, the present state of th...