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sams4 till crash using scanner?!?!?!?

Everytime I try and scan an item that I have previously programmed onto till, the till crashes. The scanner beeps when reading the barcode but then none of the till buttons work and screnn stays at 0.00
help?
Jo-Anne, March 2011
This usually means the RS232 port has not been configured for the scanner. Has this scanner been working on your cash register previously?

Registerman, March 2011