var SerialPort = require("serialport").SerialPort
var serialPort = new SerialPort("COM4", {
  baudrate: 9600
});


serialPort.on("open", function () {
  console.log('open');

  serialPort.on('data', function(data) {
    console.log('Data received: ' + data);
  });

  var command =  new Buffer([0x06, 0x00, 0x80, 0x03, 0x0B, 0x02, 0xF4, 0x01]);

  serialPort.write(command, function(err, results) {
    console.log('Error ' + err);
    console.log('results ' + results);
	serialPort.close();
  });
});