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# How do you configure the Increment/Decrement Numerical Component settings?

You can use this feature if the string that you are validating contains a sequence of digits (0-9) that either increase or decrease with each successive read. To use this feature, specify the starting position of the incrementing or decrementing digits in the Start Position field (0 is the position of the first character) and the number of characters that will change in the Length field. If you select Auto for the Length, the reader will treat all consecutive digits from the start position as the incrementing or decrementing value. Use the Step Size to specify how much the value changes between reads. Select a negative value if the number decreases.

For example, if your initial string is ABC_123XXPY and with each successive read "123" is incremented by one, you would specify a Start Position of 4, a Length of 3, and a Step Size of 1. (If you were sure that the characters in positions 7-on would never be digits, you could also specify Auto for the Length.) Note that the Auto setting does not increase the number of digits when reaching the maximum number but resets the number as with any fixed digit setting (for example, reaching 99 with two digits does not turn to 100, but to 00).

By default, if the string is invalid or could not be read, the expected numerical value does not change. You can use the Update on NoRead and Update on Validation Failure check boxes to specify that the expected value be changed when no code is read, if the code is invalid, or both.

Note: default, DMAE50, DM050, DM060, DM070, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580, DM8050, DM8070, DM8600, DM8700, MX-1000, MX-1500