[mythtv-users] OT: Denon AV Receiver Serial Port Protocol

Jeremy Green jaggroups at brownout.com
Sun Dec 30 15:23:23 UTC 2007

I have a denon avr-4306.  It does the serial protocol and it also does  
telnet and http.
I wrote a quick perl script to control it.  The telnet interface  
didn't seem as reliable so I used the web interface.
I now have it set up so that when you push the "PC Power" button on my  
MCE remote it turns on the receiver, switches the source and sets the  
volume to a reasonable level.  I also made the mute button work.
The one thing that I have been wanting to do is make the volume  
changes show up on the TV.  I was hoping that I could use Myth OSD to  
display the normal volume slider when the volume is set on the  
receiver.  The telnet/serial interface is nice enough to report when  
the volume changes.  I had a quick script up that just displayed a box  
with the volume setting but it was kind of ugly.  The slider would  
have been nicer.

Anyway, the serial interface has potential.  I think it's a little  
easier to use the web interface if the receiver has it.


On Dec 29, 2007, at 9:37 PM, Damien Dusha wrote:

> Hello all,
> This is somwhat off-topic, but many Denon recievers/amplifiers have an
> RS-232 port for external control, such as the AVR-2308
> (h)
> that I am eyeing off.  I figured this was the place to ask about open
> source  + home theatre :)
> This (I think) is the documented protocol, or at least that of that of
> another reciever:
> http://usa.denon.com/AVR-5805SerialProtocol_Ver4_37a.pdf
> Is there any open source implementation of these protocols?  I had a
> quick poke around on google without too much luck, but I am happy to
> have a poke around, unless someone has some better information.
> Cheers
> Damien.
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