Check whether a COM port is connected or not

Question

It is possible via code line to check whether a COM port is connected or not ?

Analysis: I have a program PDV(Point of Sale) where the same has the integration with Sitef, through a Pinpad(cardboard machine) and for it to work, the Pinpad has to be connected in a COM port.

Pinpad Connected:

Now, in order to make the system more robust and avoid exception when attempting to perform the procedure with the Pinpad, if it is not connected, I would like to check via code line whether or not it is connected and assign this verification in the respective events that make the integration.

Answer 1

It is not possible to know if the connector is plugged, but in most equipment to monitor the CTS signal that is used for data flow control.

if(port.CtsEnable)
{
}

If the hardware manufacturer is not using this port, then another option would be to send a status request command through the port and check for a possible response. Remember that if the device is disconnected, it will have the same effect as when disconnected.