Glossary-7
Glossary
Percent Decode
The average probability that a single scan of a bar code would result in a
successful decode. In a well-designed bar code scanning system, that
probability should approach near 100%.
Print Contrast
Signal (PCS)
Measurement of the contrast (brightness difference) between the bars and
spaces of a symbol. A minimum PCS value is needed for a bar code symbol
to be scannable. PCS = (RL - RD) / RL, where RL is the reflectance factor of
the background and RD the reflectance factor of the dark bars.
Prom
Acronym for Programmable Read Only Memory. An integrated circuit which
can be programmed through special processes and accessed at random during
normal operation. Reprogramming is possible, but only through processes
such as ultraviolet light erasing and electrical rewriting of data.
Protocol
For a specific signaling type, a set of recognized rules governing the format
and timing of message exchange. Between data communications devices, this
includes an exchange of predetermined signals arranged for both establishing
connection and for disconnecting.
Quiet Zone
A clear space, containing no dark marks, which precedes the start character
of a bar code symbol and follows the stop character.
Reflectance
Amount of light returned from an illuminated surface.
Resolution
The narrowest element dimension which can be distinguished by a particular
reading device or printed with a particular device or method.
Row Indicators
To help synchronize a PDF417 symbol’s structure, codewords which
collectively indicate which row a particular one is, which is the left and right
side of that row, how many rows are in the symbol, what security level is
encoded in the symbol, and how many data columns are in the rows. Left
Row Indicators occur in each row immediately after the Start pattern; Right
Row Indicators occur in each row immediately before the Stop pattern.
Scan
Search for a symbol to be optically recognized.
Scan Area
Area intended to contain a symbol.
Summary of Contents for LS 6800
Page 1: ...LS 6800 Product Reference Guide ...
Page 3: ...LS 6800 Product Reference Guide 70 35933 01 Revision A August 1998 ...
Page 10: ...viii LS 6800 Product Reference Guide ...
Page 32: ...3 12 LS 6800 Product Reference Guide ...
Page 100: ...5 60 LS 6800 Product Reference Guide Scanning Modes Cont d LINE ONLY PATTERN FN3 2050905 ...
Page 114: ...5 74 LS 6800 Product Reference Guide RS 232C HostTypes Cont d BEETLE RS 232C FN3 2050A8C ...
Page 117: ...5 77 Programming the LS 6800 Baud Rate Cont d 38400 FN3 2090108 ...
Page 119: ...5 79 Programming the LS 6800 Parity Cont d NONE FN3 2090304 ...
Page 129: ...5 89 Programming the LS 6800 Software Handshaking Cont d XON XOFF FN3 2090404 ...
Page 137: ...5 97 Programming the LS 6800 Numeric Bar Codes Cont d 4 5 6 7 FN3 A6 FN3 A4 FN3 A7 FN3 A5 ...
Page 138: ...5 98 LS 6800 Product Reference Guide Numeric Bar Codes Cont d 8 9 CANCEL FN3 A FN3 A8 FN3 A9 ...
Page 168: ...6 14 LS 6800 Product Reference Guide ...
Page 228: ...7 60 LS 6800 Product Reference Guide ...
Page 244: ...Glossary 10 LS 6800 Product Reference Guide ...