title: How to identify multiple USB-serial adapters under Ubuntu 10.1
body: <p>I am reading data from multiple identical USB-serial adapters under Ubuntu 10.1.</p>
  
  <p>On occasion, their /dev/tty path changes (eg if other USB devices are connected on startup).</p>
  
  <p>I need a way of repeatedly referring to the same adapter through any such changes.</p>
  
  <p>The devices all have the same serial numbers, according to udevadm.</p>
  
  <p>I think the most likely option is to identify an adapter by which port it is connected to (they don't get  moved around).</p>
  
  <p>I can find all sorts of interesting /dev paths that might work, but despite all the discussion about udev online, I can't locate a definitive statement about whether some of these paths are static if the device is plugged into a static port.</p>