title: Serial-Serial Hub
body: <p>Is it possible to merge 4 serial devices outputting data on 4 separate lines into a single serial line?</p>
  
  <p>In other words -> I see a million 'Serial-USB' hubs that take 4 DB9 inputs and merge them into a single USB output. Is there the same thing but instead of a single USB output we get a single DB9 output?</p>