Eia-485 Connections - Honeywell Notifier FDU-80 Instruction Manual

Electrical Connections

5.3 EIA-485 Connections

EIA-485 connections are made to P1 on the FDU-80. All connections must be power-limited and supervised. Enable FACP communica-
tion with the FDU-80 in the FACP programming if appropriate (refer to FACP manual). A maximum of 32 FDU-80 annunciators may be
connected to this circuit. A maximum distance of 6,000 feet (1,829 m) @ 18 AWG (0.75 mm2) is allowed between the FACP and first
FDU-80, between each FDU-80 and return to the FACP from last FDU-80. Use overall foil/braided-shielded twisted pair cable suitable
for EIA-485 applications (refer to "EIA-485 Shield Termination" on page 17, for shield termination information). Six conductor overall
shielded wire may be used for the four EIA-485 wires and the two power wires. It is, however, strongly recommended that the power and
communication wires be separate whenever possible. A Ferrite Core P/N FBD-1 is required to meet FCC Part 15 requirements if the
EIA-485 wiring is not in conduit. The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA maximum. The FDU-80 annunciator
has resistors built into the circuit board at the In (Terminals 2 & 4) and the Out (Terminals 1 & 3) for impedance matching. There is no
need for the installer to add impedance matching resistors.
Refer to the illustrations on the following pages for FDU-80 connections to the FireWarden NFW2-100, NFS2-640, and NFS-320.
16
FDU-80
P2
Earth Ground Option
-24 VDC OUT
+24 VDC OUT
FCPS-24S6/8
Figure 5.3 Power Wiring to the FCPS-24S6/8
- - + +
+
EIA-485 Out to Next Device
-
EIA-485 Out to Next Device
(or back to FACP)
+ -
EIA-485
Figure 5.4 EIA-485 Wiring to the NFW2-100
- - + +
NFS2-640/NFS-320
Figure 5.5 EIA-485 Wiring to the NFS2-640/NFS-320
- +
TB4
FDU-80
NFW2-100
FDU-80
P1
+
EIA-485 Out to Next Device
-
EIA-485 Out to Next Device
(or back to FACP)
+ -
FDU-80 Instruction Manual — P/N 51264:C2 4/24/2019
EIA-485 Connections
no connection