I use a Windows 7 64-bit system for hobby hardware / software development. I am writing a script which controls 3 separate microcontroller boards through a USB Serial port. Unfortunately, I'm finding that the COM port assignments are very dynamic, sometimes changing when the boards are power cycled and re-enumerate. I can read the registry in my script and have found several entries that contain information (sometimes for previous COM port assignments which are no longer valid), but I can't tell which are the current assignments. The information must be available somewhere because Device Manager correctly identifies the current port numbers. Can anyone point me in the right direction? Thanks, Dave.

It's taken several days and a lot of poking around in the registry plus a bunch of experiments and web searching but I think I finally have a solution that works for me. I'm posting the results here in case someone else has a similar problem. I actually found two solutions but the first one I found did not work well when I added two more boards, one of which had a different device type.

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I cannot elicit a response using the USB-serial port adapter with the 2231A-30-3. I have the baud rate correct and have the driver installed. I have tried Labview, putty and DX terminal on Windows and I have tried a mac for good measure. I will show how to communicate with an Arduino board using LabVIEW. I have made a simple example to demonstrate how to communicate via serial port between an Arduino board and a computer using NI LabVIEW software. Download ZIP Arduino sketch and LabVIEW project. Intro You can set in LabVIEW software a number N and communicate it via serial to the Arduino board.

Most of the USB serial links I use are implemented on a board with a microcontroller that has a built-in USB controller. The last board I added uses a microcontroller that has no built-in controller and instead uses an external FTDI chip that provides a UART to USB interface. The solution requires the ability to read the registry. I'm using the Tcl programming language which supports this and I assume that most other languages do as well.

The approach uses the following steps: 1) First, determine the current COM port assignment for the target board. This is done by opening up Device Manager and expanding the list of Ports (COM & LPT). This will provide a list of all serial ports currently active on the system. This can be a mix of UART based COM ports as well as virtual COM ports. If there is any question about which one the target board is, simply unplug the device and see which entry disappears and then reappears when it is plugged back in.

2) Open regedit.exe and go to the location HKEY_LOCAL_MACHINE HARDWARE DEVICEMAP SERIALCOMM. On the right-hand side there should be a list of COM ports that matches the list seen in Device Manager. On the left-hand side is the device name assigned to the COM port. In my case, the five devices I'm looking for (determined from step 1) are: Device USBSER000 Device USBSER001 Device USBSER002 Device USBSER003 Device VCP0 3) Here's where things get a bit tricky.