View source for Getting an Aten Serial to USB adapter working on 10.9+

'''NOTE:'''  ATEN have now written a driver for Yosemite that works!  Not sure about the driver for Mavericks.  Just download it [http://www.aten.com/download/download_dv.php here].  Just install it, reboot and away you go.

I'm using an ATEN UC232A adapter.  I got this from [http://rolande.wordpress.com/2012/10/25/getting-the-aten-usb-serial-adapter-working-with-mac-osx-lion/ here].  I've adapted it slightly for 10.9 (Mavericks).

1. Plug in your adapter and run "System Information" application and click on the USB devices, looking for "USB-Serial Conroller".  When you click on it you'll get something like:

   USB-Serial Controller D:
   
     Product ID:	0x2008
     Vendor ID:	0x0557  (ATEN International Co. Ltd.)
     Version:	 3.00
     Speed:	Up to 12 Mb/sec
     Manufacturer:	Prolific Technology Inc. 
     Location ID:	0x14100000 / 8
     Current Available (mA):	500
     Current Required (mA):	100

The Producut ID and Vendor ID numbers are important.  You can use the "Calculator" app, to convert them to base 10:  0x2008='''8200''' and 0x0557='''1367'''.

2. Download and install the drivers from the Prolific website [http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=229&pcid=41 here].

NOTE: The Aten UC232A and the Prolific PL2303 are basically the same device and the Prolific drivers are maintained!

3. After your reboot, edit /System/Library/Extensions/ProlificUsbSerial.kext/Contents/Info.plist

   sudo vim /System/Library/Extensions/ProlificUsbSerial.kext/Contents/Info.plist

Find the idProduct and idVendor fields and change them to the values we calculated earlier: 

   <key>idProduct</key>
   <integer>'''8200'''</integer>
   <key>idVendor</key>
   <integer>'''1367'''</integer>

They both appear in two different places, so change both.

4. Unplug the adapter and restart the kernel extension (or just reboot):

   sudo kextload /System/Library/Extensions/ProlificUsbSerial.kext

5. It should now be working.

You can now use it using your favourite terminal emulator or the '''screen''' command:

   screen /dev/tty.usbserial 9600

Ctrl a \ to exit!