USB Serial port not recognized
I have an Arduino Uno which works on my Mac running 10.11.3 this uses the Serial Port /dev/cu.usbmodemFA131.

It is 18 months since I installed this (on a previous OS) and I can't recall whether I had to install a driver

ioreg -p IOUSB shows this as

  | | +-o IOUSBHostDevice@fa130000  &lt;class AppleUSBDevice, id 0x100000955, registered, matched, active, busy 0 (40 ms), retain 13&gt;


system_profiler SPUSBDataType shows this as:-
            Communication Device:

          Product ID: 0x0043
          Vendor ID: 0x2341
          Version: 0.01
          Serial Number: 5543434373335120A2B0
          Speed: Up to 12 Mb/sec
          Manufacturer: Arduino (www.arduino.cc)
          Location ID: 0xfa130000 / 3
          Current Available (mA): 1000
          Current Required (mA): 100
          Extra Operating Current (mA): 0