Differences

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--- modulo43-barcodes [2018/01/18 22:38] – Scott Cunliffe
+++ modulo43-barcodes [2018/08/10 02:33] (current) – removed Scott Cunliffe
@@ Line 1: / Line 1: @@
-====== Modulo 43 Barcodes ======
-Modulo 43 is an extension of the Code 39 barcode symbology.
-=== How it works ===
-  * Each character of the barcode in turn is looked up in the following string "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%"
-  * When the character is found the offset of that character is added to a running total
-  * At the end of the string the subtotal is divided by 43
-  * The offset of the remainder of the division is then looked up in the search string and appended to the barcode
-|00|0| |11|B| |22|M| |33|X|
-|01|1| |12|C| |23|N| |34|Y|
-|02|2| |13|D| |24|O| |35|Z|
-|03|3| |14|E| |25|P| |36|-|
-|04|4| |15|F| |26|Q| |37|.|
-|05|5| |16|G| |27|R| |38|space|
-|06|6| |17|H| |28|S| |39|$|
-|07|7| |18|I| |29|T| |40|/|
-|08|8| |19|J| |30|U| |41|+|
-|09|9| |20|K| |31|V| |42|%|
-|10|10| |21|L| |32|W|
-=== Example ===
-Using the barcode **HJ2246**.
-Substituting the characters for the positional values gives 17 + 19 + 2 + 2 + 4 + 6 = 50
-The subtotal (50) divided by 43 gives a remainder of 7.
-Character 7 in the search string is the number 5 character.
-So a modulo 43 barcode with value "HJ2246" would be "HJ22467"
-=== How TapeTrack caters for Module 43 ===
-If your tape library consists only of media volumes that use the Modulo 43 check digit the simplest approach would be to create a barcode definition that says (presuming all of your barcodes have 6 digits) the volume serial portion of the barcode is made up of digits 1-6 of what is scanned.
-In reality things are probably not going to be that simple. So if you have some barcodes with Modulo 43 and some without this is how TapeTrack manages them:
-===See Also===
-[[barcode-processing|TapeTrack Barcode Parsing]]