I've ever use a barcode scanner to scan barcode in my project.
But I'm not expert, not sure if it's still available for yours.
RasterEdge Image Barcode Reader SDK for NET
The solution to this particular case is to keep a database of issued barcodes and their values. When a barcode is redeemed, the database must invalidate that code. http://www.keepautomation.com/guide/dotnet_barcode_reader.html
There was probably some kind of ADF Rule applyed, please scan the barcode Set All Defaults and Erase All Rules from ADF Chapter in the manual for LS4278 aailable here http://support.symbol.com/support/search.do?cmd=displayKC&docType=kc&externalId=6983404apdf&sliceId=&dialogID=190394003&stateId=1%200%20190388491
SOURCE: Symbol LS 4278 Barcode Scanner - 3 Clicks
Does it beep each time you pull the trigger while the beem is on the barcode?
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