Fire-Lite LCD-80FC Remote Fire Indicator - Manual (Page 17)

LCD-80FC Instruction Manual — P/N 53244:B 5/13/2013 17
EIA-485 Connections Electrical Connections
4.2 EIA-485 Connections
EIA-485 connections are made to P1 on the LCD-80FC. All connections must be power-limited
and supervised. Enable FACP communication with the LCD-80FC in the FACP programming if
appropriate (refer to FACP manual). A maximum of 32 LCD-80FC indicators 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 LCD-80FC, between each LCD-80FC and return to the FACP from last
LCD-80FC. Use overall foil/braided-shielded twisted pair cable suitable for EIA-485 applications
(refer to “EIA-485 Shield Termination” on page 20, for shield termination information). Six con-
ductor 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.
TB3
TB4
P2 LCD-80FC
no connection
+24 VDC OUT
-24 VDC OUT
Earth Ground Option
+ -
MS-9600LS
24 VDC
Non-Rst
Power
24
VDC
Rst
Figure 4.2 Power Wiring to the MS-9600LS
P2 LCD-80FC
no connection
+24 VDC OUT
-24 VDC OUT
Earth Ground Option
- +
TB4
FCPS-24FS6/8C
Figure 4.3 Power Wiring to the FCPS-24FS6/8C
NOTE:
1. All connections are power-limited and supervised
2. 12 - 18 AWG (0.75 - 3.25 mm2) wire for 24 VDC circuit is acceptable
3. Power wire distance limitation is set by 1.2 volt maximum line drop from source to end of circuit.