Controlling DirecTV Set Top Box (STB) via USB or Serial using MythTV (Page 4 of 5)
Categories: Homebrew & DIY Windows PC & Media Center
Mini RJ11 (RJ22 or 4P4C) to Serial Port mapping
When everything is built, the pinout of the resulting cable should be:
| DB9 Pin 5 | -> | mini RJ11 Pin 1 |
| DB9 Pin 2 | -> | mini RJ11 Pin 2 |
| DB9 Pin 3 | -> | mini RJ11 Pin 4 |
Null Modem Cable Pinout
This is a standard Null-modem cable, but here is the pinout for the sake of being complete:
| TD | (Transmit Data) | 3 | -> | 2 | RD |
| RD | (Receive Data) | 2 | -> | 3 | TD |
| RTS | (Request To Send) | 7 | -> | 8 | CTS |
| CTS | (Clear To Send) | 8 | -> | 7 | RTS |
| SG | (Signal Ground) | 5 | -> | 5 | SG |
Serial -> RJ45 (Pin to Wire) Mapping
I used a standard SUN supplied serial to RJ45 adapter and got the following mapping of the serial port pins to the individual wires on the RJ45 cable plugged in to the serial port adapter. I also used a snort length of off-the-shelf pre-made RJ-45 (Cat5) wire.
| Serial Port | RJ45 (standard coloring) |
| 1 (none) | -- |
| 2 | Orange/White |
| 3 | Green |
| 4 | Brown/White |
| 5 | Orange and Green/White |
| 6 | Blue |
| 7 | Brown |
| 8 (none) | -- |
| 9 (none) | -- |
Hardware Compatibility
- DirecTV D11-500: Channel changing works (by key). On/Off, OSD On/Off, Remote Input On/Off all work. Other features not working yet.
- DirecTV D11-300: Channel changing not yet confirmed, some problems reported
- DirecTV D11-100: Same results as D11-500.
- DirecTV D12: Same as D11-100. Except the D12 supports get_channel where the D11 does not.
- DirecTV H20: Same results as D11-500
- DirecTV D10
- Most DirecTV RCA STB's
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