trying

function send(d){

        var p = "\x02"+d+"\x0D";//adds STX y ETX

        var timeout;
        var deferred = Q.defer();
        serialPort.on('data', function (data) {
                //console.log('RECEIVED: ' + data );
                data=''+data;
              deferred.resolve(data.trim())
            });
             
        console.log("\nSENDING: "+p+'\n');+
        serialPort.write(p, function (err, results) {
            if (err) 
                    deferred.reject(new Error(err))
            });
        timeout=setTimeout(function(){
            console.log('TIMEOUT'.blue)
            deferred.reject(new Error('TIMEOUT NO ANSWER FROM SERIAL PORT'.red))
        },500);
                    

        return deferred.promise
        }
function activate(d){
var def = Q.defer();
var deco=d;
    send("06"+d)
    .then(function  (d) {
        //console.log('doing activation\n');
        //console.log('data: '+d+' len: '+d.length);
        d = d.substr(1,d.length-1);
        //console.log('recibo: '+d+',');
        if(d!="00"){
            def.reject(new Error ('recieved an error\n'.red+d))
        }
        else{
        console.log('activated  data: '+d);
       // console.log(serialPort.path)
        def.resolve(deco,d)
            }
    return def.promise
})