What the thread found

• The 4-pin Lemo connector for HU3 firmware updates uses the following pinout: pin 1 carries 12V power, pin 2 is ground, pin 3 is serial input, and pin 4 is serial output.

Depends on

• This pinout applies specifically to HU3 devices and their update cables.
• The information comes from a 2011 forum post and has not been independently verified in this discussion.

Gear in this thread

HU3

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