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10.4: Use an IOGear Serial to USB converter cable
Authored by: SDEngineerRich on Aug 08, '12 09:32:55AM
I found that in "Change Kernel Extension Property List" step 4., the GUC232A was listed as "Composite Device," not "USB-Serial Controller." If you unplug and re-plug your converter, pressing Command-R (Refresh Information) each time, you should be able to see the corresponding entry disappear and appear.

Also, in step 10., to avoid confusion, the plist file properties are "idProduct" and "idVendor."

Finally, in "Reload Kernel Extension" step 2., the command as posted failed complaining of "(libkern/kext) not found."
The following command worked for me (omitted the Contents/Info.plist at the end):

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


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