B&B Electronics 485T - Manual (Page 2)

Documentation Number 485T1995 Manual Table of Contents i
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
TABLE OF CONTENTS
INTRODUCTION ...............................................................................1
RS-422 AND RS-485 STANDARDS .................................................1
CONTROLS AND CONNECTIONS ON THE 485T ..........................6
A AND B T ERMINALS ........................................................................6
G ROUND T ERMINAL ..........................................................................6
T HRESHOLD P OT ..............................................................................7
P OSITIVE T HRESHOLD E XCEEDED LED .............................................7
N EGATIVE T HRESHOLD E XCEEDED LED............................................7
RS-422/RS-485 S WITCH .................................................................8
T ERMINATION S WITCH ......................................................................8
P OWER ............................................................................................8
RS-232 D ATA O UT C ONNECTOR ......................................................8
RS-422/485 TEST .............................................................................9