
Console UART on Raspberry Pi is headless and it works great. A 5V cable is very handy for powering small devices directly from a USB host. It works reliably with low-power devices like the Raspberry Pi Zero W and Model A. I haven't tried the Pi3, but that will surely draw too much current from the 5V on those tiny wires. I checked the TX voltage and it is indeed a logic of 3.3V. I tested it in a loop and it worked fine from 300 bps to 4 Mbps (as Minicom can reach). Tested on Linux, but this very popular chip should also work on Windows.

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