For more information, see Telnet: frequently asked questions. (in case that link goes dead in the future, google for "Denon AVR control protocol"). marantz-denon-telnet. npm package to control marantz and Denon AVR over good ol' telnet. The Denon HEOS is a network connected, wireless, multi-room music system. I have a couple of switches set up to send commands. While the protocol document references a particular model of Denon receiver (AVR-3808CI), the protocol seems to work the same for both models that I have tried to control (AVR-2808CI and AVR-2113CI, purchased 5 years apart). I’m using Wireshark to monitor the network traffic. The Command Line Interface (CLI) protocol, which allowes external seystem to control systems to manage, browse, play, and get status from the Denon HEOS products. Full Member; Posts: 145; Karma: +4/-2; Telnet commands for Denon/Marantz « on: January 24, 2014, 12:08:44 am » I've been looking at/modifying/testing this code for hours now, which I'm sure is part of the problem....I'm … Stef The HEOS CLI is accessed through a telnet connection between the HEOS product and the control system. The protocol document reads The CLI commands and responses are in human readable (ascii) format. It can listen on port 1522 for telnet commands, but this is not available for the end customers. You'll be able to access programs and services that are on the remote computer as if you were sitting right in front of it. Telnet is a text-based program you can use to connect to another computer using the Internet. For Windows 7. Telnet commands. Author Topic: Telnet commands for Denon/Marantz (Read 10535 times) ctguess. It was written to support the homebridge-marantz-denon-telnet package. I’ve been valiantly trying to get the Denon binding to send Telnet commands rather than http in OH. The binding appears to load up ok - when I look through debug I see the Telnet response from port 23 of the device (in this case an AMX NXI control gateway). The control system sends commands and receives responses over the network connection. The HEOS Command Line Interface (CLI) allows external control systems to manage, browse, play, and get status from the Denon HEOS products. This package allows to control your marantz or Denon AVR over telnet. I know it supports upnp, but I couldn’t found any documentation. Telnet commands for Denon/Marantz « previous next » Print; Pages:  Go Down. Denon AV Receivers have an official control protocol. What does this package do? Locale/Tasker features: - Power on/off, zone on/off, mute on/off, input source, surround mode, dynamic volume, quick select and direct commands. Need more information on telnet, click here. - Custom commands: Power on/off/toggle, zone on/off/toggle, input source select, surround mode, dynamic volume, quick select and direct commands.