Lenel OnGuard Hardware Installation Manual page 571

TO PREVIOUS UNIT
OR TERMINATED
To configure the two downstream BRI ports as 2-wire RS-485, follow the 2-wire diagram and repeat on each
set of three connectors, TRX+, TRX-, GND.
Notes: The BRI can be located anywhere along the RS-485 line.
Remove the RS-485 terminator for each device that is not an end-of-line device.
Device Drop Wiring
RS-485 CABLE, 120 Ohm IMPEDANCE
BELDEN 9842 OR EQUIVALENT
ACDC
AC
GND
J13
GND
IN2
GND
IN1
SN
Biometric Reader Interface
Hardware Installation Guide
TO NEXT UNIT
OR TERMINATED
DEVICE DROP WIRING
KEEP DOWN LEAD SHORT (10 FEET MAX.)
485 232
TXD
J3 TR1+
J5
RXD
J6 TR1-
J9 RTS
R1+
CTS
J8
R1-
J10
GND
TR2+
TR2-
J11
GND
TR3+
TR3-
J12
GND
S
1
A
B
U4
C
571
revision 7 —