Problem connecting Arduino to PLX-DAQ

Goodmorning everyone

I write to seek help to solve a problem I have with the use of the PLX-DAQ software.
PLX-DAQ flipping over a page similar to those of EXCEL, opens a small panel for communication with the microcontroller.
Under "Settings" you can set the speed of communication "Baud" (from 9600 to 128000) and its access port (1 to 15).
Despite having a set from a all 15 doors is never connected with Arduino and in response I get a dialog connection failure: StampDAQ could not connected. Please check port setting.
I state that in my Arduino IDE is always connected to the COM21 even when changing USB connection.
I hope someone can help me.
Thanks

moderator: updated the title to English

Under "Settings" you can set the speed of communication "Baud" (from 9600 to 128000) and its access port (1 to 15).

In my universe, 21 is not between 1 and 15. Is it in yours?

I think you will get a more useful answer if post your question again, but asking how to configure windows to connect with Arduino through a lower port than COM21. I'm afraid I have no idea how to do this, but I bet some guru does.

I don't have PLX running at the moment, but I believe you are right in that PLX has no provision to connect though a port higher than COM15. I came across this when trying to feed PLX via bluetooth on COM40.

I also believe it is exceptional to have Arduino on COM21. I have several and several computers. I have never had a connection beyond COM11 and thus have always been able to use PLX via the USB cable. I am not aware of any way to get PLX to talk through a port higher than 15.

thanks for the advice, I am convinced that the problem is caused by the position of the Arduino COM21.
Unfortunately I do not know how to change the numbering of the doors, I'll try to ask other topic.
Hello

I think you can delete old devices that you no longer have and then uninstall the Arduino drivers. Get rid of a device that has a COM number lower than 15 and plug the Arduino back in. It may reinstall the drivers and put the Arduino on a lower port. I have never tried this, however, so YMMV.