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Table of Contents
USB to COM Port Mapping
The Problem
When connecting our ECMLink cable to the laptop, the FTDI driver used by our cable wants to assign different COM ports to each cable. This is not practical for a laptop used by a shop or general tuner when connecting cables from multiple customer cars.
To correct this, you can tell the FTDI driver to use a fixed COM port for each physical USB port on your laptop.
The Solution
To tell the FTDI driver to always assign the same COM port to a physical USB port, you have to edit the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\FTDIBUS\Parameters\LocIds
In this key, you will specify the location IDs of each USB port you plan to use.
To obtain the location IDs of your physical USB ports, you can use the USBView application. When you run this application, you will be presented with a screen as shown below. Of course, the laptop on which you are running this application will have a different configuration.
