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The specs ought to be clear in the datasheet. Vdd = 4.5V to 5.5V, V IO = 1.8V to 5.5V Use whatever you got in that range, or all 5V


RS-232 is single-ended, meaning that the signal is referenced to the ground, while RS-485 is differential - signal is referenced between A and B. That's before we even talk about TE/RE(DE) signalling of half-duplex. What you need is a signal converter between single-ended (UART/RS232) to differential to even start communicating. Whether you implement it ...

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