Serial ports do not require both directions to work. You can connect just one if you want. Of course you won't be able to reply or receive but you know that. Multiple TX from a microcontroller is easy. Just send the data at the speed required. RX is harder because you have to be able to read multiple high speed random inputs at the same time. It requires careful and complicated coding and will not be small or simple. You may not be able to do it and the rest of your project as well.
There are ICs or setups that can multiplex serial lines though. See http://electronics.stackexchange.com/questions/111491/multiplexing-ttl-serial-lines-with-transistors https://electronics.stackexchange.com/questions/111491/multiplexing-ttl-serial-lines-with-transistors
Serial ports do not require both directions to work. You can connect just one if you want. Of course you won't be able to reply or receive but you know that. Multiple TX from a microcontroller is easy. Just send the data at the speed required. RX is harder because you have to be able to read multiple high speed random inputs at the same time. It requires careful and complicated coding and will not be small or simple. You may not be able to do it and the rest of your project as well.
There are ICs or setups that can multiplex serial lines though. See http://electronics.stackexchange.com/questions/111491/multiplexing-ttl-serial-lines-with-transistors
Serial ports do not require both directions to work. You can connect just one if you want. Of course you won't be able to reply or receive but you know that. Multiple TX from a microcontroller is easy. Just send the data at the speed required. RX is harder because you have to be able to read multiple high speed random inputs at the same time. It requires careful and complicated coding and will not be small or simple. You may not be able to do it and the rest of your project as well.
There are ICs or setups that can multiplex serial lines though. See https://electronics.stackexchange.com/questions/111491/multiplexing-ttl-serial-lines-with-transistors
Serial ports do not require both directions to work. You can connect just one if you want. Of course you won't be able to reply or receive but you know that. Multiple TX from a microcontroller is easy. Just send the data at the speed required. RX is harder because you have to be able to read multiple high speed random inputs at the same time. It requires careful and complicated coding and will not be small or simple. You may not be able to do it and the rest of your project as well.
There are ICs or setups that can multiplex serial lines though. See http://electronics.stackexchange.com/questions/111491/multiplexing-ttl-serial-lines-with-transistors