Q3100050: When I open a port, I get the following error: 30102 ("Unable to perform operation because the device does not exist"). What does it mean?
This means that the COM port does not exist. Error 30102 does NOT mean that the port is already in use. If the port is in use, error 30103 will be reported ("Unable to perform operation because the device is already opened") instead.(viewed: 1344)