Chapter 3: Programming Commands 97
row 1
row 2
row 3
row 4
row 5
row 6
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-
-
-
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Start Pattern
Left Row Indicator
Code words
Data Character
Code words
Right Row Indicator
Code words
Stop Pattern
Therearethreemutuallyexclusivesetsofsymbolpatterns,orclusters,eachhaving929distinctpatterns.Becausedifferent
clustersareusedforadjacentrows,itispossibleforthedecodertotellifthescanningpathiscrossingrowboundaries
without the use of separator bars.
Sample symbol description:
EachPDF417symbolconsistsof3to90stackedrowssurroundedonallfoursidesbyaquietzone.Eachrowcontains:
1 Leadingquietzone
2 Startpattern
3 Leftrowindicatorcharacters(codewords)
4 Onetothirtydatacharacters(codewords)
5 Rightrowindicatorcharacter(codewords)
6 Stoppattern
7 Trailingquietzone
Thenumberofcharactersinarowandnumberofrowscanbeadjustedtovarythesymbol’soverallaspectratiotobestt
an available space.
Eachrowhasaleftandrightrowindicatorwithadataregionbetween.Theleft-mostcharacterinthetoprowofthedata
regionisthetotalnumberofcharactersinthedataregion,excludingerrorcorrectioncharacters.Characterswithinthedata
regionaredesignedtobereadfromlefttoright,startingonthetoprow,immediatelyafterthelength-deningcharacter.
Themaximumcharactersinthedataregionare928.
Related Information:
The“Setbarcodewidth”command(1D77n)affectsthexdimensionandrowheightforPDF417.Seechartbelow.
n value x dimension row height
2 2 7
3 3 10
4 4 13
5 5 17
6 6 20
Select bar code width
ASCII GS w n
Hexadecimal 1D 77 n
Decimal 29 119 n
Value of n: 2, 3, 4, 5, 6
Default: n=3
Setsthebarcodewidthtondotsuntiltheprinterisinitialized,reset,orpoweredoff.Ifthebarcodeistoowideforthe
printingarea,thebarcodewillnotprint.
Formulas
n/8mm(n/203inch)
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