Given the pinout details for the UART, can I assume 3.3 V as voltage?

The BTE13 converter mentioned here doesn’t use 3.3V TTL logic. It has a switch 5V/3.3V, but that only affects the VCC pin on the converter. TTL still uses 5V. Could somebody from the team make this clear? The official docs clearly say that MOX uses 1.8V, so why can’t we have a similar “sure” statement about Omnia? I know there’s one particular cable mentioned, but people might want to use their own solutions…

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