Installation Manual

INS_FDC80_REV–
12/29/11
PAGE 5
FIGURE 9 – CONTACT INPUT CIRCUIT (Typ. 8)
INSTALLATION AND OPERATION MANUAL FDC80
TECH SUPPORT: 1.888.678.9427
FIGURE 10 – RELAY OUTPUTS
FIGURE 11 – RS-485 CONTACTS
INTERNAL
1K
1K
5V
1K Series*
1K
Parallel*
CONTACTSALARM
Input open
Input closed
Fault
No fault
In RS-485 products (FDC80(T,R)485), the contacts can
be transmitted over a pair of wire instead of fiber. Since
communication is simplex only, just two wires are needed:
A and B. Connect as shown:
100 m (300 ft)
Max
* Optional external resistors
(provided) are required for
supervision. Place close to
the switch for optimal results.
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO