serialport_node_example.js

var SerialPort = require("serialport").SerialPort;

var serialPort = new SerialPort("/dev/ttyACM0", {
  baudrate: 9600,
});

var buffer;
serialPort.on("open", function () {
  console.log('open');
  serialPort.on('data', function(data) {
    buffer += data.toString('utf-8');
    if(buffer.indexOf(';') > -1){
      console.log('Here is your data:'+ buffer);
      buffer = '';
    }
  });
  serialPort.write("ls\n", function(err, results) {
    console.log('err ' + err);
    console.log('results ' + results);
  });
});