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Topic starter
05/09/2020 8:32 pm
oke, a while ago I've put a dash on the Nextion via editor and simhub and it WORKS all fine. Now I want to upload a new dash on it, but with Nextion uploader I keep getting the message "Unable to open Serial Port COM4". Also after reset (unplug USB). Is COM 4 printed in Nextion or something? I did switch the USB port few times.
05/09/2020 8:39 pm
Hi it simply means an application is already using the serial port, make sure to close any potential apps using it (including simhub),
Topic starter
16/09/2020 10:01 am
Oke, so i should close all other app you said, so you mean stuff using the USB ports? And then only connect the nextion? I was in assumption that the COM4 was in use of the Nextion.
I will try to disconnect everything beside of the nextion. Thx
