Samsung Series r5+ 590 Installation Guide Page 378

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LNL-8000 Star Multiplexer
378 —
revision 1
The main run RS-485 cable should be no longer than 4000 feet (1219 m), 120 ohms maximum (Belden 9842
for 4-wire or Belden 9841 for 2-wire, or plenum cabling Belden 88102, West Penn, or equivalent). The drop
cables (to readers and other devices) should be kept as short as possible, no longer than 10 feet.
Note: If the Star Multiplexer is configured at the end of the RS-485 line, an RS-485 terminator is
required.
75.1.2 Downstream Device Communication
The Star Multiplexer topology is capable of eight different downstream directions in RS-485 (2-wire)
communications (using Belden 9841, West Penn, or equivalent) or four different downstream directions with
RS-485 (4-wire) communications (using Belden 9842, West Penn, or equivalent).
Each Leg of the star, in either configuration, has a maximum wire distance of 4000 feet. Each leg supports
up to eight (8) hardware RS-485 devices (Input Control Module, Output Control Module, Single Reader
Interface Module, or Dual Reader Interface Module) in many configurations.
Downstream Device Communication Wiring
75.1.3 Power
The Star Multiplexer accepts a 12 VDC 15% power source for its power input. The power source should
be located as close to the Star Multiplexer as possible.
Wire the power input with an 18 AWG (minimum) twisted pair cable.
Note: When using a 12 VDC power source, be sure to observe polarity.
Power Source Requirements Current
DC power sources Isolated, non-switching, regulated DC power 250 mA
RS-485 2-WIRE
TR+
TR-
GND
TR+ TR- GND
RS-485 4-WIRE
TR+
TR-
GND
TR+
TR-
GND
R+ R- T+ T- SG
Ports 2,4,6,8
RECEIVE ONLY
Ports 3,5,7,9
TRANSMIT &
RECEIVE
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