I am doing a project in which i have to multiplex 
the Rx and TX lines of the serial port on to one line.
If i do this on an 'and' gate the single line remains 
at a low (space) state.{Rx remains at mark if no data}
I want to know what is "break" and  data is
transmitted 
after a long "Break".
How is this data treated.
Is there any method you know that helps one to
multiplex both TX and RX lines onto one line. 
Ofcourse the communication will then be half duplex
with one comp. trxing and another Rxing at a time.
I'll be very gratefull to get a solution.


________________________________________________________________________
Missed your favourite TV serial last night? Try the new, Yahoo! TV.
       visit http://in.tv.yahoo.com