This item is a mini gender changer ONLY. it is not cross wired to act as a null modem and does not function for that purpose. The distributor admits this fact, offered to refund my 13 cent purchase but has not removed the item for sale or modified the description, which makes me believe that this was advertised incorrectly on purpose to generate sales.Incidentally, the shipping on a 13 cent item is $2.98.