We have a Serial device here connected to the one and only COM port on the computer. The COM port is part of the motherboard (not an PCIe expansion card). In Windows Device Manager this com port shows up as COM1.
We have a device connected to this COM port, the device itself works on another computer and is connected correctly. However, it doesn't work on this pc and we would like to know if the COM port is physically broken.
Unlike USB Device the OS doesn't detect when a device is connected/disconnected.
How is it possible to test if the COM port is actually working when a device is connected to it.
Bonus: Also is it possible to test this without knowing the speed of the connected device?