Running a POS system on a tablet?

I am setting up a POS system which is going to be web based (existing on a browser). I would like a tablet like an iPad, but have read that iOS and android doesn't allow external hardware (like barcode scanners and receipt printers) to interact with browsers for security reasons. Is this true? Do anyone have any experience with this? Thanks

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My iPad mini says iPad disabled, connect to iTunes and I did connected to iTunes but I need a passcode for it and I don't know the?

password. Does anyone know how to help in this situation?

Read more: My iPad mini says iPad disabled, connect to iTunes and I did connected to iTunes but I need a passcode for it and I don't know the?