![]() ![]() Most of the time this is not a big deal or problem unless a user tries to run some legacy software that has trouble working with COM-ports higher than 9. This ensures that there are no conflicts when two or more COM devices are connected simultaneously. Also, each port is assigned exclusively for one device and remains occupied (Windows shows it as “in use”) even if the device itself is not plugged in anymore. COM is the name of the serial port interface and can refer to both physical ports (such as RS-232), and emulated ports created by USB (USB-to-UART, USB-to-COM), and Bluetooth adapters.Įvery COM port has its number from 1 to 255. ![]() Every time you plug in a COM or USB device to your computer, the Plug-n-Play service on Windows creates a virtual COM port and assigns it to a device.
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