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This shows you the differences between two versions of the page.

--- modulo43-barcodes [2018/01/18 23:00] – 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]]