Microsoft P Linear 101 [Read Only] Linearbar Codes
2009-05-25
: Microscan Linearbar Codes 101 linearbar_codes_101 resources
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Bar Codes 101 Introduction to Linear Bar Codes Linear bar codes defined • A single row of parallel bars and spaces of varying widths that represent data. The bars and spaces are arranged in a predetermined pattern defined by the symbology Narrow bar • • • • The nominal dimension of the smallest bars and spaces in a bar code symbol Other terms commonly used for narrow bar: x-dimenion, mil size, module width MIL. = .001” = .0254mm Used as a reference for determining the size scale of the bar code .010”(.254mm) or 10 mil Quiet zone • The “no print” zone at each end of the bar code. The minimum zone needs to be 10 times the narrow bar dimension. Quiet Zone Start and stop character • Characters that determine the beginning and ending of the data set; also tell scanning direction Start & Stop Character Bar height • The measurement of the height of the bars in the bar code Bar Height Code words • A basic unit of encoding a character Data Check digit/character • A character with a symbol that performs a mathematical check when decoded to make sure the data is correct Check Digit/Character Intercharacter gap • • The space between code words used in discrete codes Discrete codes start and end with a bar This space should not be greater than (4x) Intercharacter Gap Discrete code • A bar code symbology where the spaces between characters (intercharacter gap) are not part of the code Code 39 Intercharacter gap Continuous code • A bar code symbology where all spaces within the symbol are parts of characters. There is no intercharacter gap in a continuous code. Code 128 No Intercharacter gap Common linear symbologies Symbology Continuous/ Discrete Check Characters Data Key Benefits Code 39 Discrete - Optional - Module 43 - Alpha Numeric - Numeric - Good Security - Widely Used Code 128 Continuous - Mandatory - Module 103 - Alpha Numeric - Numeric - Good Density - Good Security UPC/EAN Discrete - Mandatory - Numeric - World-wide Standard for Pointof-Sale Interleaved 2 of 5 Continuous - Optional - Module 10 - Numeric - Good Density Codabar Discrete - Optional - Module 16 - NW-7 - Numeric - Special Characters More information • If you have questions regarding this topic, send us an e-mail to training@microscan.com • If you would like further information about bar code symbologies, we recommend you view Intro to PDF417 or Intro to Data Matrix
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