See this FAQ on how to perform a RS-232 serial loopback test.įor example, a USB controller card would be under Universal Serial Bus controllers. Ideally, you should test a component that you know works in another setup.Ĭheck to see if your device is listed under Ports (COM LPT).įor example, COM1 to COM4 for serial and LPT1 and LPT2 for parallel. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is.Ĭlose the window for the port that you just tested to speed up the testing of the remaining serial ports. The loopback test fails when you cannot see what you are typing. To find out the COM port number, refer to the following FAQ. We recommend contacting the software providersupport team to check if this is the case.
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