add chrome support when checks the serial port connection.

lib/parser-v2.js

@@ -85,8 +85,8 @@ module.exports = function(serialPort){
       if(this._current) return;
       if(!this._queue.length) return;   
 
-      // if the serialport is not open yet.
-      if(!serialPort.fd){
+      // if the serialport is not open yet. Check on node && chrome.
+      if(!serialPort.fd && !serialPort.connectionId){
         var z = this;
         if(!this.boundOpen) serialPort.once('open',function(){
           z._send();