These are extremely simple transmitters and receivers that require you to do your own modulation (rapidly changing the signal from high to low) and won’t work without it. Since async serial is kind of modulated it might work, especially if you stick a number of throwaway characters on the front of a packet to allow it to sync up before the real data starts. But these really prefer a “balanced” signal such as Manchester encoding (the time spent high and low is equal), which serial doesn’t naturally provide.
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