How to use barcode scanner mcr12 with arduino?

Other Hardware Sensors
1

Please help me to use barcode scanner mcr12

2

Have you seen this datasheet

3

MCR12 can function witihout RS323/PS2/USB cabel?

4

You make the connections without a 'special' cable.
I would believe that both PS2 and USB-signals can be read by arduino.
The RS232-signals will need added hardware for signal adaption

..also: have a look at this post