Verifone MX800 Series
To verify how the unit is to be configured with your computer look at the back of the device.
Example of a MX800 series pinpad with a USB interface
If the end of the cable is Blue then the device is to be configured via USB.
Verifone MX800 USB Pinpad Install Windows XP/Vista
If the end of the cable is Green then the device is to be configured via Serial.
If the end of the cable is Brown then the device is to be configured via Ethernet.
For Advanced Configuration options please see below: