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Led-10 series – Fire-Lite LED-10 Series Remote Fire Annunciator User Manual

Page 18

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18

Document 50400 Rev B 10/27/97 P/N 50400:B

LED-10 Series

Plug-in terminal blocks

Notes:
1) All connections are power-limited and supervised.
2) A maximum of 32 LED-10 Series Annunciators may be connected to this circuit.
3) 6,000 feet (1,800 m) maximum distance @ 18 AWG (0.75 mm

2

) between the panel and

annunciators.

4) Use overall foil/braided-shield twisted pair cable suitable for EIA-485 applications (refer to Section

Four for shield termination information).

5) The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA maximum.
6) The LED-10 Series Annunciators must have the supplied R120 (120 ohm) resistor installed

across the EIA-485 terminals on the last or only device connected to the EIA-485 bus as shown.
The resistor is required for impedance matching.

Figure 3-3: EIA-485 Connection

No connection

Shield

+ EIA-485

- EIA-485

Refer to Note 6

TB2