Windows 10: error 433,communication port COM3 could not be opened

the communication port COM3 could not be opened. windows error#433-se ha especificado un dispositivo que no existe.


i have thies error when i try to made a communication between a module AG9 trough usb to ttl serial module, but the proble is had that problem tanks for your help.

:)

 

Problems with Phisical Serial Ports Com3 Com4

WINDOWS 10
I am working it with Arduino microcontrollers connecting them via ports com3 or com4.
I had a random problem where half of the time communication did not work. I was receiving semaphore time out problems.
The problem was usually going away after the series of restarts. I was trying to find a permament fix. I thought there is something wrong with COM3 and COM4 settings. I tried to delet and install them anew and now I don't see them anymore. And have no clue how to fix it.
In Control Panel automatic scan for new hardware is not detecting them.
I am including two screenshots to describe my dilema.
I managed to somehow enable the communication to work on COM4 last night.
Now as you can see I see no COM3 COM4 in Control Panel but when I list the list of ports it shows COM4 as Busy.

Any help would be greatly appreciated

 

COM3 COM4 ports missing

I have posted this thread in General support but now I think this section may be better.

WINDOWS 10
I am working it with Arduino microcontrollers connecting them via ports com3 or com4.
I had a random problem where half of the time communication did not work. I was receiving semaphore time out problems.
The problem was usually going away after the series of restarts. I was trying to find a permament fix. I thought there is something wrong with COM3 and COM4 settings. I tried to delet and install them anew and now I don't see them anymore. And have no clue how to fix it.
In Control Panel automatic scan for new hardware is not detecting them.
I am including two screenshots to describe my dilema.
I managed to somehow enable the communication to work on COM4 last night.
Now as you can see I see no COM3 COM4 in Control Panel but when I list the list of ports it shows COM4 as Busy.

Any help would be greatly appreciated

 

Bluetooth coms fail with duplicate com3 port

After further testing it would appear that if I create an incoming At Serial port manually then the instrument will connect and transfer data, which is a significant improvement.

However the process is not straight forward -:

Start app & Check ports => 1x com3

Open settings => bluetooth and other devices.

Pair instrument

check "Bluetooth settings" > com ports (Com3 & Com4)

Check ports in app: 2xcom3 and 1x com4

Try to connect from app=> none of ports will connect

go to "Bluetooth settings" & delete all com ports (1xcom3 and 1x com4)

Create incoming port => creates 1x com3 incoming serial.

Goto app => displays 2xcom3

App connects using first com3

I will try to streamline this.

The pairing process clearly does not create com ports that work. But why should a manually-created port work?