var RC = function (arduino, pin) {
  if(!arduino){throw new Error('Arduino must be set');}
  this.arduino = arduino;
  this.pin = pin;
}

RC.prototype.send = function(tristate) {
  var str = '';
  for(i = 0; i < s.length; i+=2) { str += String.fromCharCode(parseInt(tristate.substr(i,2), 16)); }
  arduino.write(new Buffer('W' + String.fromCharCode(97 + this.pin) + str,'ascii'));
};

RC.prototype.sendDecimal = function (len, val) {

  len = this.arduino.valueToFirstTwo(len);
  val = this.arduino.valueToLastFour(val);

  arduino.write(new Buffer('W' + String.fromCharCode(97 + this.pin) + len + val,'ascii'));
};