Trying to interact with Sendyne Current Sensor SFP101

serial-port-sendyne.js

var com = require("serialport");
var serialPort = new com.SerialPort("/dev/ttyUSB0", {
    baudrate: 19200,
    parser: com.parsers.raw
});

serialPort.open(function (error) {
  if ( error ) {
    console.log('failed to open: '+error);
  } else {
    console.log('open');
    
    /*
    setInterval(function() {
      serialPort.write('s', function(err, results) {
        if (err) console.log('err ' + err);
        //console.log('results ' + results);
      });
      
    }, 1000);*/
    
    serialPort.on('data', function(data) {
        console.log('data received: ' + data);
      });
    
    /*serialPort.write('s', function(err, results) {
        if (err) console.log('err ' + err);
        console.log('results ' + results);
    });
    
    
   serialPort.on('data', function(data) {
        console.log('data received: ' + data);
    });
  */
  }
});