gistfile1.js

var rfxcom = require('./lib');

var rfxtrx = new rfxcom.RfxCom("/dev/tty.usbserial-05VLOAQQ", {debug: true});

rfxtrx.on("receive", function(data) {
  console.log(data);
});


rfxtrx.on("elec2", function(evt) {
  console.log(evt);
});


rfxtrx.on("status", function (evt) {
  console.log("Status message");
  console.log("Subtype: " + evt.subtype);
  console.log("Sequence number: " + evt.seqnbr);
  console.log("Command: " + evt.cmnd);
  console.log("Receiver Type: " + evt.receiverType);
  console.log("Firmware Version: " + evt.firmwareVersion);
  console.log("Enabled Protocols:");
  for (var n = 0; n < evt.enabledProtocols.length; n++) {
    console.log(" " + evt.enabledProtocols[n]);
  }
  console.log("");
});

rfxtrx.initialise(function (error) {
  if (error) {
    throw new Error("Unable to initialise the rfx device");
  } else {
    console.log("Device initialised");
  }
});

This works for me !