Upstream Communication - Lenel OnGuard Hardware Installation Manual

LNL-1300-U Single Door Controller Module
Input Resistor Table
Normal
Alarm
Fault - Line Short
Fault - Line Open
Fault - Foreign Voltage
78.2

Upstream Communication

The Single Reader SDC Interface Module uses Port 1 to communicate to the Intelligent System Controller.
Port 1 is a 2-wire RS-485 interface, that requires the following type of RS-485 cable: 24 AWG (minimum)
twisted pair (with shields). The main run RS-485 cable should be no longer than 4000 feet [1219 m], 100
ohms maximum (Belden 9841, West Penn, or equivalent). The drop cables (to downstream devices) should
be kept as short as possible, no longer than 10 feet.
The RS-485 communication is asynchronous, half-duplex, using 1 start bit, 8 data bits, 1 stop bit.
Note: RS-485 communication is supported for upstream communication only.
394 —
revision 7
Alarm Zone Contact NC
1K ± 10%
2K ± 10%
0 - 50
∞
15K -
50 -750
1250 -1500
2500 -15K
SDC upstream wiring
Alarm Zone Contact NO
2K ± 10%
1K ± 10%
0 - 50
∞
15K -
50 - 750
1250 - 1500
2500 -15K