BSSerialPort

function serialOut()
{
    console.log("*** serialOut **");

    // '2' is the first externally connected USB  port on Cheetah
    var serial_out = new BSSerialPort(2);

    serial_out.SetBaudRate(115200);
    serial_out.SetDataBits(8);
    serial_out.SetStopBits(1);
    serial_out.SetParity("none");
    serial_out.SetEcho(true);

    serial_out.SetGenerateByteEvent(true);
    serial_out.SetGenerateLineEvent(true);

    serial_out.onserialbyte = function(e){
        console.log('### onserialbyte: ' + e.sbyte);
    }

    serial_out.onserialline = function(e){
        console.log('### onserialline: ' + e.sdata);
    }

    serial_out.SendByte(89);
    serial_out.SendByte(90);
    serial_out.SendByte(91);

    serial_out.SendBytes('Hello World!');
    serial_out.SendBytes(String.fromCharCode(64, 27, 66, 67))
}