When I disarm the alarm, I want the M1XEP to send strings to the Denon to turn on, go to a specific source, and raise the volume to 45. I can send IP strings from the M1XEP to another IP Address and Port (hopefully the Denon Receiver). I have an M1G Security System with an M1XEP Ethernet Expander. After some more research, I cannot remember where, it said that the Denon is looking for a "packet" of information and it must be received in 40ms. All I am doing is connecting to the IP Address of my Denon on Port 23. Have you tried this sample already? (not sure if it is also for your device) As a test, I deleted the app because I read somewhere that the receiver can only handle one connection at a time. When I use the Denon App on iPhone, I also see the strings leaving the receiver, as I change the volume, so I am pretty sure if my phone can communicate over IP, then I should also be able to as well. Sometimes the receiver will respond to a command out of the blue, but nothing consistent. I send MV46 to change the volume to 46 using all the types of carriage returns and I get nothing. If I increase the volume from 45 to 45.5 I see MV455. I can connect and then control the receiver via the factory Denon remote while I monitor the strings sent from the receiver. To increase the volume, I've tried MVUP, MVUP\r\n, MVUP, MVUP0x0D, MVUP^M^J (ELK-M1G Carraige Return), but nothing seems to cause a change in the receiver. I am trying to send it strings via RS232 and IP but it does not respond.
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