Model 2253P is a USB device that combines the functions of a model 2253 A/V codec, GPS receiver, and two multifunction ports in a compact and robust metal enclosure. All operating power is supplied by a single USB port.Each multifunction port can operate as an incremental quadrature encoder interface or as dual general purpose digital inputs (GPIO). Encoder counts, GPS data, and GPIO states can be monitored over USB. Real-time encoder counts and GPS data can be overlaid onto any video stream and GPIOs can pause and start streams, all without host intervention.