The read/write cable had been out of stock for several months. We recently got more and sent a shipment over to Signature Solar and our other distributors as well, so that they would have some available to send out/complete orders. If you did not get one, please get with them and they can send you one. They just arrived at the end of last week. It may take a day or two for them to count inventory and add them to the system, but they do have them now.