Troubleshooting: Unidentified Developer Error Browse the Hardware > USB tree to determine what COM port the FTDI enumerated on.
This is similar to the device manager used on Windows OS. You can determine what COM port an FTDI device enumerated to by opening the Mac OS X's "System Information" in Lion or later (or "System Profiler" in Snow Leopard and earlier versions of Mac OS).
Plug it back in, and select the device that has now reappeared. The device you unplugged should no longer be listed. To figure out which device is which, look under the Arduino IDE's 'Serial Port' menu. Note: If you have more than one FTDI device plugged in to your computer at the same time, all of the devices will show up in the Arduino IDE's Serial Port menu and device manager.
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