Installing a USB Serial Adapter on Mac OS X. Then open a terminal window on your Mac OS X machine and type $ cat /dev/cu.usbserial If you’ve connected another Mac OS X machine with another USB-to-Serial adapter. AS SOON AS YOU PLUG A DIFFERENT DEVICE TO THE USB PORT YOU HAVE TO REPEAT THESE STEPS!!! David Roberts September 11. 1) Using telnet to find if port is open on a remote/localhost using the command as: telnet hostname portnumber If a port is open then there would be some output on the terminal other wise it would say connection refused or something similar message.

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script and have found several entries that contain information (sometimes for previous COM port assignments which are no longer valid), but I can't tell which are the current assignments.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. 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. Nvidia quadro 4000 for apple mac pro 2gb how to install. 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. In my Tcl program I can read the registry and, using the device types listed above I can narrow down the list of all the devices listed by using a regular expression on the device name. I now have identified the device IDs for the five boards but which is which? (Okay, I can guess that VCP0 is the one that uses the FTDI chip, but as for the other four I have no clue).