20
FDU-80 Instruction Manual —
P/N 51264:C2 4/24/2019
UL 864 8th Edition Applications
EIA-485 Connections
A.2 EIA-485 Connections
EIA-485 connections to the annunciator must be power-limited and supervised. A maximum distance of 6,000 feet (1829 m) @ 18 AWG
(0.75mm
2
) twisted, shielded cable is allowed between the FACP and first FDU-80, between each FDU-80 and return to the FACP from
the last FDU-80. The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA maximum. Programming at the FACP may be required
to enable EIA-485 communication. Refer to the appropriate FACP Programming Manual.
Refer to the following illustrations for EIA-485 connections to UL 8th edition panels: NFS-640, AFP-300/400, and FireWarden NFW-
100.
P2
FDU-80
no connection
+24 VDC OUT
-24 VDC OUT
Earth Ground Option
- +
NFW-100
Figure A.3 Power Wiring to the NFW-100
+
- +
- +
-
TX RX REF TX RX REF
B+ A+ B- A-
FDU-80
TB12
EIA-485
+
EIA-485 Out to Next Device
-
EIA-485 Out to Next Device
(or back to FACP)
+ -
- - + +
P1
NFS-640
Figure A.4 EIA-485 Wiring to the NFS-640
FDU-80
+
EIA-485 Out to Next Device
-
EIA-485 Out to Next Device
(or back to FACP)
+ -
- - + +
P1
AFP-300/400
TB3
EIA-485
Figure A.5 EIA-485 Wiring to the AFP-300/400
