I need to multiplex one RS232 serial port to one of four RS232 ports. Can this be done? Can a TTL Serial port be multiplexed to 4 TTL Serial ports? Some TTL devices require inverted signals and some do not. How would I handle this? Standard Baud rates to a minimum of 9600. Computer control of port selection. 

I want to build this my self not purchase an off-the-shelf solution.

Any enlightenment will be appreciated.

Vic
________________________________________________________

Victor Fraenckel - The Windman         
victorf ATSIGN windreader DOT com
KC2GUI                                                  

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