[mythtv-users] controlling directv D12-300 via usb

[Tim Litwiller]

Well, my case and mother board have no serial ports. So I guess I'll be
getting 4 cables and 2 null modems.



On 7/16/07, David George <david at thegeorges.us> wrote:
>
> On 07/15/2007 11:35 PM, Tim Litwiller wrote:
> > I recieved my 2 d12-300 directv recievers.  They have a usb a
> > connector on the back of them I find that people are suggesting
> > getting 2 usb 2 serial cable and a null modem adapter between them. If
> > I usderstand correctly that is what these data transfer cables that
> > computer places are selling with new Windows Vista machines to
> > transfer your setting and data from your old computer to the new
> > computer.  Does anyone know how those cables work - is there a chance
> > that they wold work?
>
> I haven't tried it myself, but I doubt the Vista cable would work.  The
> reason the USB to serial converter cables work is because they have a
> USB-RS232 chip that the Directv receiver supports (and also that Linux
> supports on its side).  In order for the Vista cable to work it would
> most likely need back-to-back RS232 converter chips in the cable.  That
> would be very inefficient as RS232 max can be about 400Kbits or so (some
> are higher), while USB can be 480Mbits.  If you get the cable for free
> or cheap go ahead and try it, but don't get your hopes up.  Also, if you
> have a free RS232 port on your computer (or two in your case) you don't
> need a USB to RS232 converter for the Myth side.
>
> --
> David
>
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