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Technical Support Questions

Serial

To ensure your serial device is installed properly, complete the following:

  1. Open the Device Manager by pressing the Windows Key + R. Type “devmgmt.msc” and press Enter.
  2. Expand the Ports (COM & LPT) section.
  3. You should see a COM number in brackets to the right of each port, and there should not be any exclamation points or question marks next to the entries in the list.

 

Some serial devices require a specific COM port number to function. In these cases, consult the manual of your serial device to determine the correct number to use.

To change the COM port number of a serial device in Device Manager, complete the following:

  1. Open the Device Manager by pressing the Windows Key + R. Type “devmgmt.msc” and press Enter.
  2. Expand the Ports (COM & LPT) section.
  3. Right-click the COM port and select Properties.
  4. Click the Port Settings tab and click Advanced.
  5. Change the COM port number to an available COM port number.

Note: Multiple serial ports cannot share the same COM port number.

  1. Restart your computer.

Note: Even if you change the COM port number back to the original number, you still need to restart your computer.

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