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Ben

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Why does my GS1 barcode read as GS and not FNC1 after the first element string?

I am using your product to generate GS1-DataMatrix barcodes for my customer.

Here is the data:
(01)0901634940641(10)10014057(240)66081223

I encoded it as:
~10109016349406411010014057~124066081223

It scans as:
]d20109016349406411010014057<GS>24066081223 in your Scanner ASCII Decoder

It is not putting the FNC1 before the 240 Application Identifier. My customer says it needs to have the FNC1 and not the <GS>

Here is the report:
image

It is not adding the FNC1, it is adding the <GS>.




12-19-14     1034 day(s) ago     Views: 4031

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Ben

Best Answer

The first AI (1) will always have the decode as ]d2 because it is a flag to the reader/application that it is a GS1 barcode. Because the second AI (2) element string is variable and another variable length element string comes after it, it is not required to have a separator. However, because the third AI(3) element string is variable (and the previous element string is variable), it will include the FNC1 encode which is always interpreted as a separator <GS>. This is what it means when a document refers to the two uses of the FNC1. The first position will decode as ]d2 (for Data Matrix) or ]C1 (for Code 128). The second use is when it is decoded within the second or subsequent element strings; it appears as the GS.

image

View page 22 of the GS1 document. The illustration requires the FNC1 encode which is interpreted as a separator. Separators occur after the very first element string. Therefore, when the FNC1 is used as a separator, the scanner must transfer the FNC1 character as a field separator <GS>.

The FNC1 only means function code, it is not specific to <232> or ]d2. This just happens to be the identifying characters that appears for the very first AI element string (in the application interpretation and scanner interpretation). Any other AI element strings that requires an FNC1 encode will act as a separator between two element strings. In your case, you have two variable element strings. The only way the scanner or application can determine that it's are not one continuous string is by inserting the GS separator which is still an FNC1.

Since the very first AI element string is fixed the scanner/application knows that the second AI element string will not be confused with the first. The second element string does not require an FNC1 encode. However, the next element string (which is variable) will require it. Therefore, when entering the third AI element string it requires the FNC1 (which is only a function code). Since it is not the first in the data, it will be interpreted as a GS which is mentioned in the PDF.




Additional Resources:

GS1 DataMatrix: FNC1 versus GS as the Variable-Length Field Separator Character

About Encoding the FNC1



Posted 1034 day(s) ago

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