Fire-Lite Alarms LCD-40 Series Manual page 20

LCD-40 Series Electrical Connections
Figure 4-2: EIA-485 Connection
LCD-40 Series
Terminal Block replacement
P/N 02108
+ EIA-485 IN from source
- EIA-485 IN from source
Notes:
1. All connections are power-limited and supervised
2. A maximum of 32 LCD-40 Series annunciators may be con-
3. 6,000 feet (1,800 m) maximum distance @ 18 AWG (0.75 mm
4. Use overall foil/braided-shielded twisted pair cable suitable for
5. The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA
6. The LCD-40 Series annunciators have resistors built into the cir-
20
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P1
Out to next LCD-40 Series or
return to host FACP if last or
only annunciator on line
nected to this circuit
between the panel, annunciators and return to the panel.
EIA-485 applications (refer to "EIA-485 Shield Termination" on
page 23, for shield termination information)
maximum
cuit 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
Document 50327
firealarmresources.com
(+) (-)
EIA-485
Rev D1 1/14/99 P/N 50327:D1
EIA-485 Connection
P2
Terminal Block
replacement
P/N 02109
2
)