[mythtv] Re:IR input ports on cable boxes -- how to drive?

[DanM]

David, could you pin out the plug for me?  My dig cable box has an ir 
blaster port on it, and I would like to use it instead of going the ir 
transmitter route

-dan

David Shay wrote:

>>I have a SA 3100. Mine also has an IR port but from reading the information
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>on SA's web page it's strictly
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>>for controlling a vcr.  I just assumed that was the final word on the
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>matter.
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>>So just to understand, with the connection the Tivo, where did you schedule
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>your recordings from , the Tivo EPG or controls or
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>>from the cable box itself ?  SA sells some kind of blaster, that plugs
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>into the port of the 3100 and then has a blaster at the other
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>>end to dangle in front of the the vcr.
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>Yes, information out there on these boxes, such as
>http://www.twrochester.com/images/kb/stguide2200.pdf clearly indicate that
>the port is intended for their "VCR commander" service, which does appear to
>be an "outbound" control port.  They must also be accepting input, though,
>since the Tivo is able to control this -- clearly an undocumented feature of
>the box.  The Tivo comes with an "IR blaster" and a port on the back where
>this connects.  This enables it to control cable boxes and sattelite boxes
>using the Tivo EPG and recording software -- you never use the
>cable/satellite remote again; the Tivo controls it, much as I would like
>MythTV to.
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>>From what I have been able to tell, it's probably fairly likely that both
>the IR port on the 2200 and the Tivo IR port is a fairly standard serial
>port mapped to a phono plug.  I suppose it's possible that I could just use
>the cable from the Tivo (DB-9 to phono plug) and lirc_serial.
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