Multiplexing serial port ( Rx,Tx)

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hi

i'm working on project consist on supervision sms ;

now i'm stuck, i'm wondering multiplexer use connecting 4 machines rx,tx arduino pins, picture below explain i'm talking :

any suggestions welcome  ;)

we can't see picture. can click addition options below, browse local picture, , attach it.

you can connect arduino tx multiple other inputs, it's arduino rx need worry about.
you can make mux 74hc08 , 74hc32:


Arduino Forum > Using Arduino > LEDs and Multiplexing > Multiplexing serial port ( Rx,Tx)


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