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LNL-1000 Intelligent System Controller
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.
To configure as two 4-wire RS-485 ports, follow the 4-wire diagram:
Port 2/3:
(Transmit)
TR2+, TR2-
Port 4/5:
(Transmit)
TR4+, TR4-
or combine 2-wire and 4-wire RS-485:
Port 2/3:
(Transmit)
4-wire
TR2+, TR2-
Port 4:
TR4+, TR4-
2-wire
Port 5:
TR5+, TR5-
2-wire
Notes:
The ISC can be located anywhere along the RS-485 line.
Install an RS-485 terminator for each end-of-line device.
84 —
revision 7
RS-485 Communication Wiring
RS-485 CABLE, 100 Ohm IMPEDANCE
BELDEN 9842 OR EQUIVALENT
Reader Interface Module
(Receive)
GRD
TR3+, TR3-
(Receive)
GRD
TR5+, TR5-
(Receive)
GRD
TR3+, TR3-
GRD
GRD
TO NEXT UNIT
OR TERMINATOR
KEEP DOWN LEAD SHORT
(10 FEET MAX.)
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