Lenel OnGuard Hardware Installation Manual page 67

TR2 +
TR2 -
GND
TR3 +
TR3 -
GND
2-WIRE
TO PREVIOUS UNIT
OR TERMINATOR
To configure all four downstream ISC ports as 2-wire RS-485, follow the 2-wire diagram and repeat on each
set of three terminators, TRX+, TRX-, GND.
Downstream Device Communication Wiring (Ports 2-3)
Ports 2 - 3
RS-485
GND T- T+
RS-485 Communication Wiring
RS-485 CABLE, 100 Ohm IMPEDANCE
BELDEN 9842 OR EQUIVALENT
Reader Interface Module
Hardware Installation Guide
TR2 +
TR2 -
GND
TR3 +
TR3 -
GND
GND TR- TR+ R- R+
Downstream Device
4-WIRE
TO NEXT UNIT
OR TERMINATOR
KEEP DOWN LEAD SHORT
(10 FEET MAX.)
Earth
Ground
67
revision 7 —