For example, some adapters may reserve up to 30 or even more COM ports. If the device is connected to a different physical USB port, a new COM port number will be assigned to it. Another issue may appear when some specific devices take too many ports. For example, such an app may work well with COM1 to 9, but fail if there are no free COM ports below COM10. 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. Every COM port has its number from 1 to 255.
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June 2023
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