cat /dev/ttya | tee /fifo.file1 | cat > /fifo.file2 &

You can most likely get rid of the second cat, because '| cat >' is the same as '>', wrt functionality: 

$ echo foo | cat > myfile
$ cat myfile
foo

$ echo foo > myfile
$ cat myfile
foo

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In reply to Re^3: serial port bridge (virtual) by Eliya
in thread serial port bridge (virtual) by steve_thorley

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