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How to connect more than 2 serial devices to an ARM microcontroller?
or how to use a single serial port of a microcontroller for 2 devices?You may multiplex UART using ICs such as 74HC4052 or you can program GPIO pins as UART (Software UART).
Here is a small module made using IC 74HC4052, you can use the following link for reference.
https://www.atlas-scientific.com/_files/_datasheets/_circuit/serial_port_connector_datasheet.pdf
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