Detecting USB comms ports

knobby67 · 12-21-2007, 01:45 PM

Hi all,
I've been working on code using rs232 comms ports, except I need to add some additional comms ports using USB to rs232. The problem is I have no idea where the USB will attach to, so I don't know what ports to write to in my code.
Has anyone any idea how I can find out what ports the USB has assigned, with out connecting it to another pc and doing trial and error.

David1357 · 12-21-2007, 02:55 PM

Quote:

Originally Posted by knobby67

Has anyone any idea how I can find out what ports the USB has assigned, with out connecting it to another pc and doing trial and error.

My Keyspan USB-to-serial adapters start at "/dev/ttyUSB0". The first one plugged in gets assigned to 0, the second to 1, etc. I do not know how they get assigned if they are already plugged in at boot.

Plug yours in and look at the output of "dmesg" to see where it ends up.