Programmable Diagnostic Candidate Select
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
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.