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View Thread: USB cannot read barcode scanner
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    As figuerres has said, these devices usually 'inject' their data stream as though someone had typed it in via a keyboard. So for all intents and purposes, it is a keyboard.

    But just to be sure, here are some links so you can confirm exactly what you have: [PS/2 connector]   [DE-9 connectors]

    Also, whilst the keyboard data stream is a serialised one, it's not RS-232, which is what your suggesting when you talk about serial ports - which is probably why figuerres introduced the possibity of it being an RS-232 device - I'd doubt it.

    You'll also need to explain what you mean by doesn't work. eg  it seems to be getting no power, etc.