One way is to time how fast the characters are coming into your keypress event. A human can't type nearly as fast as a scanner. If characters are coming in faster than a human can type, clear the field.

Another way is to make it very obvious where cursor is at with a big colored box around current input field. That little blinking cursor or selected back color is hard to find but a big white/yellow/red/black box makes it easier to see where current input is.

Still another is to add a maximum customer change amount setting. Most could run it at $100. A warning message would appear if change was more than $100 and request a manual approval. Clear the typeahead buffer before displaying the message.

>Hi,
>
>In our POS Application, users will sometimes inadvertently scan a barcode when the app is expecting an amount tendered (a numeric field). Since the scanner is set to add a CRLF the app thinks the amount tendered is some huge amount and happliy tells the cashier to give the customer a nice fat amount of change.
>
>Is there anyway to tell the app to accept data from the barcode scanner only when I want a barcode?
>
>Thanks,
>
>Ken