DMX Input / Output

That's strange... bind should really fix the can't create on undefined error.

What happens is this.serial.on calls your function, but it calls it as a function, rather than as a method call... so this never gets set to the correct thing.

this.serial.on( 'data', this.newData.bind(this) ); is a bit like saying:

x = this;
this.serial.on( 'data', function(a) {
  x.newData(a);
});

So it makes sure that newData gets called on the correct object. Hope that makes sense!