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For those unfamiliar, a USB UART is basically a "serial port" that can be added to a computer, exposing TX / RX lines for electronic communication with a target device. These come in handy for many uses, probably the most common of which is getting a debug shell on some embedded Linux system. Unfortunately, not all devices agree on the voltage level that should be used for such serial interfaces. Some devices are nice enough to "tolerate" a wide range of voltages, while some other less flexible ones simply fry up if you dare present them with an extra volt...

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