Lenel OnGuard Hardware Installation Manual page 569

Wire Configuration – Switch #5 must be off for all panels in this configuration.
107.1.3 Power
The BRI accepts either a 12 VDC or 12 VAC ± 15% power source for its power input. The power source
should be located as close to the BRI as possible.
Wire the power input with 18 AWG (minimum) twisted pair cable.
For AC power sources, the following lines are required: AC Line (L), AC Neutral (N). These lines must not
be interchanged. A 400 mA RMS current is required for AC power supplies.
For DC power sources, isolated and non-switching, regulated DC power is required. A 250 mA current is
required for DC power supplies.
Note: If using a 12 VDC power source (preferred), be sure to observe polarity.
107.1.4 Downstream Device Communication
The BRI can be configured to communicate downstream with up to 8 input/output devices, using Port 2 and
Port 3. Each of these ports can only be wired only as a 2-wire RS-485 interface, for multi-drop
communication on a single bus of up to 4000 feet.
Upstream Host Communication Wiring (Port 1)
TXD/TR1+
RXD/TR1-
RTS/R1 +
CTS/R1 -
GND
2-WIRE
PORT 1, CONFIGURED
AS RS-485
Power Source Wiring
12 VAC
... OR ...
+
12 VDC
–
Hardware Installation Guide
EARTH
GROUND
ACDC
AC
GND
ACDC
AC
GND
569
revision 7 —