DS-009: RTS and CTS signals polarity in the Telemetry port table is confusing

[kaklik]

The telemetry port pinout table omits the RTS and CTS signal polarity marking.

It is confusing because the polarity is marked on most USB serial converters, like FT231 and many others. The negated polarity of the signals is marked by # symbol in these datasheets.
Another possible method of marking the negated signal is overline.

Both of these signal markings mean "signal is active in low", eg in the case of a hardware handshake - when the pin is high it means "don't send me any data".

[JacobChrist]

Agreed, related I don't think it says anywhere that a mark is +3.3V and a space is ground for Rx/Tx. I have also recently noticed that RTS and CTS are sometimes reversed and that there are competing definitions for functionality.