Bluetooth HC-05 module - why are there two COM ports?

Projects Networking, Protocols, and Devices
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Why are there two COM ports after connecting the Bluetooth HC-05 module to my PC running on WIN10?

See this image from Device Manager

For sending data I use only one of them but I have to check it before which is correct. I have no idea what the second is used for.

Any idea?

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I believe the other is for receiving, you might check that. This is not exclusive to Windows 10, nor is it always the case, indeed I have never experienced it. All my Dell laptops use a Toshiba bluetooth manager which is separate from Device Manager. I guess Toshiba laptops use it too. I imagine other laptops use something similar, but this is because they come with Bluetooth out of the box while PCs usually don't. I guess I got lucky when I put a Bluetooth dongle in my PC. It may be possible to install a laptop Bluetooth handler in a PC but I have never heard of it.

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Nick_Pyner:
I believe the other is for receiving, you might check that. This is not exclusive to Windows 10, nor is it always the case, indeed I have never experienced it. All my Dell laptops use a Toshiba use a bluetooth manager which is separate from Device Manager. I guess Toshiba laptops use it too. I imagine other laptops use something similar, but this is because they come with Bluetooth out of the box while PCs usually don't. I guess I got lucky when I put a Bluetooth dongle in my PC. It may be possible to install a laptop Bluetooth handler in a PC but I have never heard of it.

Hi, I've tested that and for sending and receiving data I use only one port. I mean one of them. So it doesn't look like that there is one port for receiving and the other for sending. I guess it's for something else.

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This has been discussed before, so you can trawl for it. I don't know what the result was.

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Nick_Pyner:
This has been discussed before, so you can trawl for it. I don't know what the result was.

Unfortunately, I can't find it :frowning:

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This guy might be suggesting the Toshiba manager can be used on a PC....

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