Controlling DirecTV Set Top Box (STB) via USB or Serial
The DirecTV D11 Satellite set top box contains a USB port that can be used as a serial port to change channels and perform other tasks on the box. To do this, you need the following cables:
- USB->Serial Adapter (IOGEAR GUC232A, ATEN UC-232A, BAFO BF-810 are known supported) (usb male to 9 male)
- 9-pin Null-Modem Adapter (9 female to 9 female)
- 9 pin serial cable. (9 female to 9 male)
The end result of this is a null modem serial connection between computers. I assume that using two USB->Serial adapters would also work, given that the Null Modem adapter was still used.
I used the BAFO BF-810 adapter (found for $9 online) and a pair of 9pin DSub to RJ45 adapters wired as a crossover serial cable, along with a straight-through ethernet cable.
I started with the directv.pl script used to control the D10 box. I had to change the speed to 115200 from 9600 (contrary to the installers guide which says 9600 or 155200, which must be a typo). I also had to enable hardware flow control in order to get reliable operation.
This is a standard Null-modem cable, but here is the pinout for the sake of being complete:
|RTS||(Request To Send)||7||->||8||CTS|
|CTS||(Clear To Send)||8||->||7||RTS|
- DirecTV D11-500: Channel changing works, other features flaky
- DirecTV D11-300: Channel changing not yet confirmed, some problems reported