- GS1 QR-Code Overview
- Generating and Encoding the FNC1
- Summary Chart
In 2012, GS1 QR-Code became a ratified standard for use within the GS1 System, primarily for sharing extended packaging information associated with a product GTIN. GS1 also supports the encoding of multiple AIs within QR-Code symbols as the FNC1 character. For consumer goods, GS1 recommends using either GS1-DataMatrix or GS1 QR-Code when brand owners want to encode a link to a website. When either barcode is scanned by a consumer, the same information should be transmitted regardless of the symbology used.
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If the desired product does not yet support GS1 QR-Code, GS1 DataMatrix may be another option since either GS1-DataMatrix or GS1 QR-Code may be used according to GS1 documentation.
GS1 specifications call for the FNC1 character to be used as a data field separator at the end of a variable-length data field. In IDAutomation GS1 QR-Code symbols the first FNC1 is included with the ~1 character and additional FNC1 characters may be encoded with ~1 in any mode. In addition, to comply with GS1 QR specifications, the character <GS> (encoded as ~d029) in
byte mode or the % character in alphanumeric mode may also be used. In all cases, the scanner should decode additional FNC1 characters as ASCII 29 which is character <GS>.
When GS1 QR-Code is used for sharing extended packaging information, as in Fig. 2 below, Application Identifiers AI (01) and AI (8200) are mandatory and other GS1 AIs are optional.
There are two methods of encoding FNC1 characters within QR-Codes and these are referred to as first position (GS1) and second position (AIM):
- FNC1 mode in first position refers to a GS1 symbol and it is encoded with the ~1 character. IDAutomation will refer to this as GS1 QR-Code.
- FNC1 mode in second position is encoded with the ~2 character and identifies symbols formatted in accordance with specific industry or application specifications provided by AIM International. IDAutomation will refer to this as AIM QR-Code. The first AI is required directly after the ~2 in parentheses in all AIM QR-Code symbols.
Fig. 1: GS1 QR-Code symbol encoding (01)04912345123459(15)970331(30)128(10)ABC123 in alphanumeric mode, which includes the GTIN, best before date, quantity and batch number. Parentheses should not be part of the data encoded in GS1 QR-Code symbols.
|DataToEncode using ~1||~101049123451234591597033130128~110ABC123|
|DataToEncode using ~1 and %||~101049123451234591597033130128%10ABC123|
|Data Returned from scanner||]Q301049123451234591597033130128<GS>10ABC123|
|DataToEncode using ~1||~101049123451234591598200https://www.idautomation.com|
|Data Returned from scanner||]Q301049123451234591598200https://www.idautomation.com|
When generating AIM QR-Code symbols, the first AI is required directly after the ~2 in parentheses. The parentheses will not be encoded and are only used to encode the first AI within the symbol. If additional FNC1s need to be encoded, they should be encoded as ~2 in any mode. In addition, to comply with AIM QR specifications, the character GS (encoded as ~d029) in byte mode or the % character in alphanumeric mode may also be used.
|DataToEncode using ~2||~2(37)AA1234BBB112~28200https://www.idautomation.com|
|DataToEncode using ~2 and GS||~2(37)AA1234BBB112~d0298200https://www.idautomation.com|
|Data Returned from scanner||]Q537AA1234BBB112<GS>8200https://www.idautomation.com
|Barcode Type||Encoded First AI||Encoded Second AI||Decoded First FNC1||Decoded Second FNC1|
|~1||~1 or ~d029||]Q3||<GS>|
|~1||~1 or %||]Q3||<GS>|
|~2||~2 or ~d029||]Q5||<GS>|
|~2||~2 or %||]Q5||<GS>|
According to GS1 specifications, when GS1 emulation is enabled, the first FNC1 character should be decoded as “]Q3” when it is a GS1 symbol or “]Q5” when it is an AIM symbol and any additional FNC1 characters should be decoded as <GS> (ASCII 29). The first 3 characters of this decoded symbol are referred to as the AIM symbology identifier. Not all scanners properly decode symbology identifiers or FNC1 characters. The <GS> character is not visible when scanned unless used with an advanced verifier or the IDAutomation Scanner ASCII String Decoder. The screenshot below is the decoded symbol of Fig. 1 above, scanned with the IDAutomation 2D USB Scanner. To enable this decoding within the scanner, refer to the GS1 emulation programming guide.
QR-Code barcode symbols may be easily verified with the Print Quality Assessment program found in the IDAutomation 2D Barcode Scanner. The test can determine the symbology identifier, mask number, version number, and it will also grade the symbol and report any possible problems. The report below was generated when scanning the symbol in Fig. 1 from the screen with PQA enabled:
>> PQA << ]Q301049123451234591597033130128<GS>10ABC123 QR CODE: MODEL 2 VERSION 2 (25 x 25 modules) Mask Pattern Reference #2, Error Correction Level "L" Data Field: 34 data & 10 checks in 1 block(s) of GF(256) X roughly = 0.051" [C] < Data Safety Margin = 46% [A] < Horizontal Print Growth = +16% of X [A] < Vertical Print Growth = +20% of X