# Telnet commands to FourKay 4K HDBT switcher

**URL:** <https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486>\
**Category:** General\
**Created:** [3 March 2026 01:02 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486 "2026-03-03T01:02:17Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![BartKrap](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bartkrap/32/106001_2.png) [@BartKrap](https://discourse.nodered.org/u/BartKrap)\
**Post date:** [3 March 2026 01:02 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/1 "2026-03-03T01:02:17Z")

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Hello,

I have a Fourkay (OREI) HDBT matrix which I would like to integrate with Home Assistant through Node-RED. See: [https://www.youtube.com/watch?v=i756a9TwtpQ](https://www.youtube.com/watch?v=i756a9TwtpQ)

I'm able to send Telnet commands through Putty without issues but I have been unable to do it through Node-RED.

I installed the node-red-contrib-telnet-client to test but that hasn't worked either.

Can anyone send me in the right direction?

Relevant links:

> **[4K 8x8 HDMI Matrix Extender CAT5e/6/7, Upto 500 Ft](https://www.orei.com/products/8x8-hdmi-matrix-switcher-extender-hdbaset-over-cat5e-6-7-cable-uhd88-exb400r-k)**
>
> Buy a 4K 8x8 HDMI Matrix Extender & HDBaseT CAT5e/6/7 upto 500 Feet from OREI with a 30 day return policy, 1 year warranty & free shipping in the US.

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**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [3 March 2026 07:49 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/2 "2026-03-03T07:49:42Z")

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Welcome to the forum.

Looking at the documentation - there is no 'telnet' - did you connect it using RS-232 ?  
If yes, then you may need install the [serial port node](https://flows.nodered.org/node/node-red-node-serialport)

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [3 March 2026 08:38 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/3 "2026-03-03T08:38:34Z")

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err - [https://support.orei.com/hc/en-us/articles/34720914144023-How-can-the-UHD88-EXB300R-K-be-controlled](https://support.orei.com/hc/en-us/articles/34720914144023-How-can-the-UHD88-EXB300R-K-be-controlled)

if he's sending command via putty then yes there is (even if its a slightly different model) ... usually the issue is adding the correct "enter" key character at the end of the line - often you need to add \r or sometimes \n - or both or something else...

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**Author:** ![BartKrap](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bartkrap/32/106001_2.png) [@BartKrap](https://discourse.nodered.org/u/BartKrap)\
**Post date:** [3 March 2026 10:23 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/4 "2026-03-03T10:23:41Z")

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I've tried \n but not \r or both. I'll give that a try.

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**Author:** ![BartKrap](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bartkrap/32/106001_2.png) [@BartKrap](https://discourse.nodered.org/u/BartKrap)\
**Post date:** [3 March 2026 13:20 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/5 "2026-03-03T13:20:11Z")

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For reference, it was \r

Thanks!

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [17 March 2026 13:21 UTC](https://discourse.nodered.org/t/telnet-commands-to-fourkay-4k-hdbt-switcher/100486/6 "2026-03-17T13:21:12Z")

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