[mythtv-users] Serial-USB control of Directv H20

William william_munson at comcast.net
Sun Oct 12 13:09:13 UTC 2008

Dave Badia wrote:
> I have a Directv H20 receiver, and have been trying to get channel 
> changing working reliably through the USB connection.  It seems to 
> work just fine for a day or 2, but then the receiver will stop 
> responding via the usb port:
> Initializing Serial Port: /dev/ttyS0
> SEND: 0xFA [] 0xA5 [] 0x0 [] 0x1 [] 0xE8 []
> RECV: Timeout Error
> All other functions on the H20 see to work fine, it's just the USB 
> port that stops responding
> The only solution I have found to reset the H20 via the red button.  
> Immediately after that, the script will work again for a few days at 
> the most.
> I'm looking for feedback from others as to if anyone else is having 
> similar issues.  The references I have found indicate that others have 
> this working without issue:  
> http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=319270;page=1;mh=-1;list=mythtv;sb=post_latest_reply;so=ASC
> Thanks
> Dave
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Sounds like a hardware issue. Try turning off support for USB 2.0 and 
force it to send at a slower rate. Thats usually a bios function on most 
motherboards. There may also be a "legacy" mode you can try.

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