ADT Security Services ADT-LCD40 Bedienungsanleitung PDF herunterladen (Seite 22)

ADT-LCD40 Series Electrical Connections EIA-485 Connection

Document 50520 Rev D 7/25/00 P/N 50520:D

Notes:

1. All connections are power-limited and supervised

2. A maximum of 32 ADT-LCD40 Series annunciators may be con-

nected to this circuit

3. 6,000 feet (1,800 m) maximum distance @ 18 AWG (0.75 mm

)

between the panel, annunciators and return to the panel.

4. Use overall foil/braided-shielded twisted pair cable suitable for

EIA-485 applications (refer to “EIA-485 Shield Termination” on

page 25, for shield termination information)

5. The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA

maximum

6. The ADT-LCD40 Series annunciators have resistors built into

the circuit board at the In (Terminals 2 & 4) and the Out (Termi-

nals 1 & 3) for impedance matching. There is no

need for the

installer to add impedance matching resistors

Figure 4-2: EIA-485 Connection

Terminal Block replacement

P/N 02108

Te r m i n a l B lo c k

replacement

P/N 02109

(+) (-)

EIA-485

Out to next ADT-LCD40 Series

or return to host FACP if last or

only annunciator on line

+ EIA-485 IN from source

- EIA-485 IN from source

ADT-LCD40 Series

6,000 feet (1,800 m) maximum wire run

from and back to FACP (3,000 feet to last

ADT-LCD40) @ 18 AWG (0.75 mm

)

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ADT Security Services ADT-LCD40 Bedienungsanleitung Seite 22