The width of each dot scales with the graphic.
A character will be the exact same width (11 "dots") unless it is the stop character (in which case 13 "dots").
CODE 128 CHECKSUM CALCULATOR ONLINE CODE
When you try to decypher a Code 128 barcode, keep in mind that there is no such thing as intercharacter spacing. Because the Code 128 standard doesn't attribute any special significance to the character in the checksum position (last character before the STOP), it won't matter. The checksum is a result of the modulo operator on the weighted sum of the elements in the barcode and the number 103, therefore any number up to 102 (FNC1) can be the result of the checksum. It is possible to have a checksum equal to the FNC1 character? Yes. The second checksum for the barcode without the FNC1 is the number 26 or Code 128 character ':' for colon. The checksum calculated for the first barcode is the number 09 or Code 128 character ')' for right paren. As Terry Burton states, the FNC1 at the beginning indicates the barcode is used for GS1 and the data for that code is normally denoted (30)925018. The original barcode had the FNC1 at the beginning.
Why do online tools generate barcodes without a checksum, but with FNC1 at the end?.I tried to generate barcode from the given data by Java libs in my application, and by online tools. It is calculated by summing the start code 'value' to the products of each symbol's 'value' multiplied by its position in the barcode string. The check digit is a weighted modulo-103 checksum. Generated decrypted barcode Сlarifications Then I tried to generate a barcode from given data and got these images:Īs you can see, the images are different. I tried to read the barcode (see image below) using a mobile barcode reader and online tools and got it: data - 30925018, visualization algorithm - Code128C Step 2
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