FAQ

Barcode scanners FAQ

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1. What is a checksum?

   Checksum is a special number - the most common last digit barcode. It is calculated according to strictly specified (although generally well known) algorithm based on the remaining digits in the barcode. It is used to validate the read code. Both the printer and barcode scanner must know the algorithm for calculating the check digit for different types of barcodes.
   
   Part of the barcode types obligatorily contains the check digit (eg. EAN8, EAN13, UPCA, UPCE), while others may or may not be.
   
   If the barcode contains a check digit and is mandatory (the aforementioned codes) are any code scanner verifies after reading the last digit and sends the code to the computer only when it is correct (thus concluded that the code has been correctly read).
   
   If the check digit is not mandatory for this type of code - it's the scanner is usually an option to force the verification and the user can turn it on. As long as this option is not enabled - scanner sends the code to the computer, regardless of whether the code is contained in the check digit or not.
   After switching weryfikaji is often able to decide, whether the code is to be sent to the computer after it has determined that the scanner, correctness check digit, or send in spite of non-compliance with the algorithm.
   
   In addition to all the opportunities associated with scanners can also verify the bar code already on your computer using a specially skonstrułowanego software. 

2. The scanner reads codes but does not transmit them to a computer or a till

    

   RELATED TO: MS-951 KB, Pulsar MS6220, MS9520, MS-9540 KB

    

   POSSIBLE CAUSES:

   Damaged keyboard connector (PINS bent in the plug)

   SOLUTION: straighten or replace the cable pins

    

   Incorrect configuration of the scanner

   SOLUTION 1: Re-load the default configuration:

   • Read the Code 'Enter / Exit' (on the beginning of the programming handbook)
   • Read the code 'Recall Defaults (located on the beginning of most instructions)
   • To end the programming process, re-read the Code 'Enter / Exit (begining of the instruction)

   SOLUTION 2: Turn the keyboard emulation (readers MS-9520/40)

   • Read the code 'Load Keyboard Wedge Defaults (located in the' Keyboard 'on p. 71 or H1 depending on the instruction)