Is it possible to stop DMXSerial to start another serial port on the Arduino Uno?

[KoenigTA]

Hey,
I am building a project with the Arduino Uno with Midi and DMX. Now I have the problem that I can only use one serial at a time. To need only one Arduino anyway, I tried to stop the Serial. The Serial for Midi stops with Serial.end(), but the DMXSerial does not stop. Is there a way to stop the DMXSerial to make room for the other Serial?
Thanks for any response.