Axelson, Jan. <br/><br/>
Serial port complete  programming and circuits for RS-232 and RS-485 links and networks 
Jan Axelson. 
 - Madison, WI  Lakeview Research  c1998. 
 - xiv, 306 p.  ill.  26cm.  1 computer disk (3 1/2 in.) 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0965081923 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer interfaces--Standards--United States.<br/>Parallel programming (Computer science)