issue, when scan few barcodes one byone


I have a problem with my android applicationon PDA device
I made an simple application (Firemonkey, only Memo on Form) and want to scan barcodes with buit-in barcode scanner.

On memoKeyUp event I wait for Enter character

if (Key = vkReturn) then
some code ….

Problem is if I scan 3 or 4 barcodes and all is fine, but suddenly my code is not executed. It is look like enter character is not came from scanner?
And when I scan again my code is executed twice!

I know you are not clairvoyants, but maybe someone has any idea what I can check or read barcode characters other way.

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