Problem with simultan serial communication

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