The standard volume readers, on the other hand, are not of high quality like the high volume readers. Due to this, they often require an additional pass for them to read your card. Interface: The readers have three main interface options: serial, USB, and PS/2 keyboard wedge.

USB and PS/2 interfaces send information back to the computer as if it was typed on the keyboard. Card readers connected using serial interfaces often require special software in order to interpret data.

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