635-SERIES HARDWARE M ANUAL
Chapter-Page
2-51
STEP-10 PINOUT GUIDE FOR RS-485 MULTIDROP
•
Boards must be installed in a multidrop (daisy chain) configuration.
•
DO NOT USE A “STAR” CONFIGURATION ON THE RS-485 SECTION.
Table 29: WIRING PINOUT FROM THE 635-DSI TO FIRST INPUT BOARD
DSI BOARD RS-485 (J5 / J6) FIRST INPUT BOARD RS-485 ON MULTIDROP
A
(pin 1)
to A
B
(pin 2)
to B
GND
(pin 3)
GND
GND
(pin 3)
Ground Drain wire at DSI END ONLY for this line segment
UNUSED
(pin 4)
- -
Use this pinout guide for the first Input board on the multidrop.
Never wire more than one board to a DSI Section.
Table 30: WIRING PINOUT FROM ONE INPUT BOARD TO NEXT INPUT BOARD
INPUT BOARD RS-485
TO NEXT INPUT BOARD ON MULTIDROP
A
to
A
B
to
B
GND
GND
Ground Drain wire to only one board
(do not ground both ends of the drain wire).
Use this pinout guide for each individual Input board on the multidrop.
Only one (1) Input Board can be wired to a Input Board.
Never wire more than one board to another board.
