RS-422 and RS-485Application NoteB&B Electronics Mfg. Co. Inc.P.O. Box 1040 -- Ottawa, IL 61350PH (815) 433-5100 -- FAX (815) 434-7094Internet Addresses:B&B Home Page:Customer Service:Technical Support:http://www.bb-elecsales@bb-electechsupt@bb-elec? B&B Electronics - Revised October 1997RS-422/485 Application NoteCover PageB&B Electronics -- PO Box 1040 -- Ottawa, IL 61350PH (815) 433-5100 -- FAX (815) 434-7094Table of ContentsCHAPTER 1: OVERVIEW ............ 1INTRODUCTION................ 1DATA TRANSMISSION SIGNALS.............. 1Unbalanced Line Drivers ..........1Balanced Line Drivers .............. 1Balanced Line Receivers...........