# Sending RS232 from homey **URL:** \ **Category:** Questions & Help\ **Created:** [February 12, 2023, 2:45pm UTC](https://community.homey.app/t/sending-rs232-from-homey/76389 "2023-02-12T14:45:12Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Eus](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/eus/32/56061_2.png) [@Eus](https://community.homey.app/u/Eus)\ **Post date:** [February 12, 2023, 2:45pm UTC](https://community.homey.app/t/sending-rs232-from-homey/76389/1 "2023-02-12T14:45:12Z")
Hi guys, i have a anthem mrx 740 and now i use it from my harmony. It working okish but i want to use it with ip/rs232 commands. I just dont know how to start, anyone did anything similair? An command list is here: [https://www.anthemav.com/downloads/MRX-x20-AVM-60-IP-RS-232.xls](https://www.anthemav.com/downloads/MRX-x20-AVM-60-IP-RS-232.xls) The unit listens at port 1499. Hopefully someone can help me. ---
**Author:** ![Adrian\_Rockall](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/adrian_rockall/32/13209_2.png) [@Adrian\_Rockall](https://community.homey.app/u/Adrian_Rockall)\ **Post date:** [February 12, 2023, 6:15pm UTC](https://community.homey.app/t/sending-rs232-from-homey/76389/2 "2023-02-12T18:15:18Z")
RS232 is an electrical specification that defines a physical connection method and Homey doesn’t have an RS232 connection. The link you have given is a list of commands that would be sent over an RS232 connection. There is nothing there to define how the commands would be sent of TCP/IP, e.g. which port to send the commands too, etc. ---
**Author:** ![VanGilles](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/vangilles/32/11478_2.png) [@VanGilles](https://community.homey.app/u/VanGilles)\ **Post date:** [February 12, 2023, 8:38pm UTC](https://community.homey.app/t/sending-rs232-from-homey/76389/3 "2023-02-12T20:38:25Z")
I also have a amp which can be controlled by rs232. I made a arduino sketch with a arduino board and a rs232 expansion board (about 10 euro total) and use the homeyduinio app over WiFi. But you have to build it yourself. ---
**Author:** ![James\_Wyatt](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/james_wyatt/32/33967_2.png) [@James\_Wyatt](https://community.homey.app/u/James_Wyatt)\ **Post date:** [April 9, 2023, 8:44am UTC](https://community.homey.app/t/sending-rs232-from-homey/76389/4 "2023-04-09T08:44:17Z")
I am trying to do the same. I would love homey to be able to send a TCP command to the anthem TCP port 14999. For example: Command to select input 3 is Z1INP3. But I can’t find a way to let homey send such a command. I am trying to use my old homewizard, via the ip-switch device. But I get a null error. So yeah… still not solved… Yet ---
**Author:** ![Driesk](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/driesk/32/10666_2.png) [@Driesk](https://community.homey.app/u/Driesk)\ **Post date:** [April 11, 2023, 6:30pm UTC](https://community.homey.app/t/sending-rs232-from-homey/76389/5 "2023-04-11T18:30:10Z")
It should be possible to send rs232 commands via mqtt to a wemos or nodemcu. I did something simular to control axa window openers. It is writen in dutch. If you need more explanation please ask via pm. > [@AXA remote 2.0 bedienen / klimaat regeling deel 2](https://community.homey.app/t/axa-remote-2-0-bedienen-klimaat-regeling-deel-2/47167/58): > > Inmiddels heb ik de code een stuk robuuster gemaakt. -Hostname wordt direct aangepast aan de topicname om deze beter te kunnen herkennen op je netwerk -Code toegevoegd die elke 5 minuten de mqtt verbinding controleert en evt hersteld. -Er waren nog wat schoonheidsfoutjes bij het doorgeven van de status die zijn nu opgelost. -Er is nu de mogelijkheid om een MQTT inlognaam en wachtwoord op te geven. -Aansturing linbus converter gaat nu via softwareserial waardoor je via usb makkelijk kunt mee…