32- and 64-bit PL2303 drivers for OS X 10.6 are available here.

You'll need to modify, as root, the '/System/Library/Extensions/ProlificUsbSerial.kext/Contents/Info.plist ' file after installing the driver to suit the USB manufacturer and device ID. For the ATEN UC232A, examples below appear to work for it (for me in 10.7).

To obtain the IDs, Wayne Roberts (who informed my via the SAGE-AU mailing lists), used 'USB Prober.app' which comes with the developer tools/XCode.

Modify the current lines of the XML:

# <key> can be the Hex values as 'Vendor'_'Product', Wayne thinks this is more cosmetic however.


# <idProduct> and <idVendor> should be the decimal of the respective values, as per USB Prober.app

Once you've done this, either restart the machine or run 'kextunload' and 'kextload' on ProlificUsbSerial.kext and it should show up as /dev/tty.usbserial.

** If you have installed the UC232A Drivers, either rm or mv the 'UC-232AC.kext' before the reboot to avoid conflicts **

12 thoughts on “Mac OS X 10.7 Lion + ATEN UC232A USB to Serial Adapter”
  1. Thanks for these tips. Unfortunately I am like Marton, where the Aten device can be seen in USB device tree (via 10.7 AKA Lion, System Profiler) but /dev/tty.usbserial isn’t there and I don’t seem to be able to communicate with my attached Zebra serial barcode printer via the ATEN UC232A.

    Any other advice. Many thanks in advance!

  2. Buggar for both you two. You sure you edited the device? You don’t have any kexts from other drivers conflicting do you? I did and had to manually rm it …

  3. Thanks for the tip. I had this ATEN adapter working before and got broken when updating for Lion. Look’s like working now, but with with a different device name than before. No biggie.

  4. Add another product vendor key to support multiple vendors

    Using the Prolific 1.4 version of the driver (www.prolific.com.tw/eng/download.asp) you can just add another block. So in the end you have something like this:


    This way different vendor’s usb-serial adapters will work (ATEN and Prolific OEM in my case)



  5. The extension doesn’t load at boot. This only works for me, when I go to the terminal and execute: sudo kextload /System/Library/Extensions/ProlificUsbSerial.kext/

    How do I get the extension to load automatically at boot?

  6. (I forgot to tik the two “Notify me of…”. So just delete my previous post.)

    The extension doesn’t load at boot. This only works for me, when I go to the terminal and execute: sudo kextload /System/Library/Extensions/ProlificUsbSerial.kext/

    How do I get the extension to load automatically at boot?

  7. This post got me very close to getting my Aten UC232A working on OSX 10.7.5, I had to change what I added to Info.plist

    Here is the entire Info.plist my additions are line numbers 45 through 61. Once I made the additions the performed kextunload then kextload everything is working perfect.

    5 CFBundleDevelopmentRegion
    6 English
    7 CFBundleExecutable
    8 ProlificUsbSerial
    9 CFBundleGetInfoString
    10 ProlificUsbSerial v2.2.0, Copyright 2006 Prolific Technology Inc.
    11 CFBundleIdentifier
    12 com.prolific.driver.PL2303
    13 CFBundleInfoDictionaryVersion
    14 6.0
    15 CFBundleName
    16 Mac OS X Driver for Prolific USB-to-Serial Bridge Device
    17 CFBundlePackageType
    18 KEXT
    19 CFBundleShortVersionString
    20 2.2.0
    21 CFBundleSignature
    22 ????
    23 CFBundleVersion
    24 2.0.0
    25 IOKitPersonalities
    27 067B_2303
    29 CFBundleIdentifier
    30 com.prolific.driver.PL2303
    31 IOClass
    32 com_prolific_driver_PL2303
    33 IOProviderClass
    34 IOUSBInterface
    35 bConfigurationValue
    36 1
    37 bInterfaceNumber
    38 0
    39 idProduct
    40 8963
    41 idVendor
    42 1659
    45 0557_2008
    47 CFBundleIdentifier
    48 com.prolific.driver.PL2303
    49 IOClass
    50 com_prolific_driver_PL2303
    51 IOProviderClass
    52 IOUSBInterface
    53 bConfigurationValue
    54 1
    55 bInterfaceNumber
    56 0
    57 idProduct
    58 8200
    59 idVendor
    60 1367
    65 OSBundleLibraries
    67 com.apple.iokit.IOSerialFamily
    68 1.0.4
    69 com.apple.iokit.IOUSBFamily
    70 1.8
    71 com.apple.kpi.iokit
    72 10.0.0
    73 com.apple.kpi.libkern
    74 10.0.0
    75 com.apple.kpi.mach
    76 10.0.0

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