four kinds of communication are provided: standard rs-232, infrared, rs-485, and rf.

    ·rs-232: transmission speed up to 115200bps

    ·infrared: standard irda 1.0 and high speed ir.

    transmission speed up to 115200bps

    distance: 5 to 100 cm

    view angle: 30 degrees

    ·rs-485: through cradle, multi-drop up to 32 units

    ·rf: transmission rate up to 9600bps

    distance: up to 100 m