What should you do if you encounter the "serial Open failed" error when using the Config Tool?

What should you do if you encounter the "serial Open failed" error when using the Config Tool?

Setup:
Power the VT device using an external adapter via the 26-pin all-in-one test cable. Connect the VT to your computer using a USB-to-Serial cable.

Issue:
What should you do if you encounter the "serial Open failed" error when using the Config Tool?

Solutions:

  1. Check Config Tool Version:
    Verify that you are using the latest version of the Config Tool.

  2. Verify Physical Connection:
    Ensure the RS232 connection between the VT and the USB adapter is wired correctly (Cross-over connection):

    • Rx to Tx

    • Tx to Rx

    • GND to GND

  3. Check PC Recognition (COM Port):
    Open Device Manager on your computer. Expand the "Ports (COM & LPT)" section and verify that the USB-to-Serial adapter is recognized and assigned a COM port number (as shown below).