Did you see this: http://denon-uk.custhelp.com/app/answers/detail/a_id/1274/~/avr-not-responsive-to-rs-232-commands
Re: IRT-WiFi-DB: how do I send RS232 commands?!
Posted: Thu 20. Dec 2012, 19:33
by reiniertc
I did see it, actually. (in fact: I think I've seen almost every denon related page )
Right now, I'm happy to report that IT'S WORKING !!!
Switching pin 1 and 5 didn't do the trick, but the solution is: expand the original wiring with a wire on pin 5, leading that to a common ground. For instance the common ground of a wall socket or TV-cable plug.
Marcus, Eric: thank you for your great assistance on this one