Fire-Lite LCD-80FC Remote Fire Indicator - Manual (Page 19)

LCD-80FC Instruction Manual — P/N 53244:B 5/13/2013 19
EIA-485 Connections Electrical Connections
NOTE:
1. All connections are power-limited and supervised.
2. A maximum of 32 LCD-80FC indicators may be connected to this circuit.
3. 6,000 feet (1,800 m) maximum distance @ 18 AWG (0.75 mm2) between the FACP and first
LCD-80FC, between each LCD-80FC and return to the FACP from the last LCD-80FC.
4. 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 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.
5. Ferrite Core P/N FBD-1 is required to meet FCC Part 15 requirements if the EIA-485 wiring is
not in conduit.
6. The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA maximum.
7. The LCD-80FC indicator 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.
8. Enable FACP communication with the LCD-80FC in the FACP programming if appropriate
(refer to FACP manual).