Jan,Axelson <br/><br/>
Serial Port Complete:Programming and Circuits for Rs-232 and Rs-485 Links and Networks. 

 - Mumbai  Penram International Pub.  1998 
 - xiv+306 
<br/><br/><label>ISBN: </label>81-87972-03-3 
<br/><br/><label>Universal Decimal Class. No.: </label>681.324  / AXE.98