# Problem with simultan serial communication

**URL:** <https://discourse.nodered.org/t/problem-with-simultan-serial-communication/95313>\
**Category:** General\
**Created:** [11 February 2025 10:36 UTC](https://discourse.nodered.org/t/problem-with-simultan-serial-communication/95313 "2025-02-11T10:36:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Bobbybau91](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bobbybau91/32/34729_2.png) [@Bobbybau91](https://discourse.nodered.org/u/Bobbybau91)\
**Post date:** [11 February 2025 10:36 UTC](https://discourse.nodered.org/t/problem-with-simultan-serial-communication/95313/1 "2025-02-11T10:36:03Z")

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Hello everyone,

I have a Revolution Pi 4 with:

- RS232 interface via USB
- RS485 interface integrated

I am using Node-Red. If I now access the individual interfaces via serial node, this works without any problems. If I now use both interfaces at the same time, there are problems and only one works sporadically.

Does anyone know this and have a solution?

Greetings,  
Bob

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [12 May 2025 10:37 UTC](https://discourse.nodered.org/t/problem-with-simultan-serial-communication/95313/2 "2025-05-12T10:37:04Z")

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