This guide will show you how to install the FTDI drivers which work for US on OSX:

Download the drivers from the FTDI website: http://www.ftdichip.com/Drivers/VCP.htm

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You will now need to delete the preinstalled Apple FTDI drivers:

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On El Capitan you will need to use this command to see the device: screen /dev/tty.usbserial-xxxxxxxx [baud]

This FAQ Applies to the following Brainboxes Product Ranges: