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How can I discover, using C#’s SerialPort class, whether a device is connected to a specific serial (COM) port?
Note: that class’s Open method opens the port even if there is no device connected to the port.
The answer depends on the device and the cable.
In some cases, DSR (
SerialPort.DsrHolding) or even CTS (SerialPort.CtsHolding) will be raised when the device is connected.But in some cases you may only have Tx / Rx connected, and the only way to tell is to attempt to communicate with the device.
You need to look at the documentation for your device and its cable.
There’s no general solution that works for any device.