Browse Prior Art Database

Programmable Diagnostic Candidate Select

IP.com Disclosure Number: IPCOM000047231D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Broockman, EC: AUTHOR [+2]

Abstract

This article describes a technique which allows a scanner microprocessor to periodically select and read a diagnostic label affixed to the scanner. The diagnostic label consists of standard UPC guard and data characters and a non-standard center character. The scanner processor intermittently provides a simulated center character signal to a diagnostic decode circuit to allow the diagnostic label to be recognized. Fig. 1 is a generalized depiction of a diagnostic label which can be used in carrying out the technique to be described. The diagnostic label includes a standard UPC guard character and six standard UPC data characters. The center character is non-standard. Because of the non-standard center character, the diagnostic label is not selected by normal candidate select logic. Fig.

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Programmable Diagnostic Candidate Select

This article describes a technique which allows a scanner microprocessor to periodically select and read a diagnostic label affixed to the scanner. The diagnostic label consists of standard UPC guard and data characters and a non- standard center character. The scanner processor intermittently provides a simulated center character signal to a diagnostic decode circuit to allow the diagnostic label to be recognized. Fig. 1 is a generalized depiction of a diagnostic label which can be used in carrying out the technique to be described. The diagnostic label includes a standard UPC guard character and six standard UPC data characters. The center character is non-standard. Because of the non- standard center character, the diagnostic label is not selected by normal candidate select logic. Fig. 2 is a block diagram of a portion of the system for implementing the technique. The system includes normal 6N and 6P decode facilities 10 and 12 and corresponding diagnostic label decode facilities 14 and
16. The facilities 10 and 12 are conventional in that they identify or select a label candidate by comparing the relative width of adjacent guard, data and center characters in the stream of data. The absolute widths of these characters vary but not the relative widths. When the diagnostic label is scanned, either decode facility 10 or 12 will provide valid comparisons for the guard and data characters but not for the center character. Under these conditions, neither facility will prov...