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Important:
37.3
Reader Wiring
Each reader port supports Wiegand, magnetic stripe, and 2-wire RS-485 electrical interfaces. Power to the
reader is selectable: 12 VDC (VIN must be greater than 20 VDC), or power is passed-through (PASS) from
the input voltage of the LNL-4420 (TB1-VIN), and is current-limited to 150 mA for each reader port.
Readers that require different voltage or have high current requirements should be powered separately. Refer
to the reader manufacture specifications for cabling requirements. In the 2-wire LED mode the Buzzer
output is used to drive the second LED. Reader port configuration is set via the host software.
PASS 12V
12V
PASS
GND
DAT/D0
CLK/D1
BUZZER
LED
POWER
Data1/Data0 - Clock/Data
37.3.1
Open Supervised Device Protocol
Open Supervised Device Protocol (OSDP) uses bi-directional communications between readers and the
reader interface, providing constant monitoring of reader health, improved control of reader operation and
configuration in real-time, and additional communications capabilities over a single connection, including
biometric template download and LCD reader display control. For OSDP, set the baud rate to 9600 bps.
Install the termination jumper ONLY on the panel at each end of the RS-485 bus.
Failure to do so will compromise the proper operation of the communication
channel!
READER POWER
12 VDC is available on reader ports (VIN is greater than or equal to 20 VDC).
VIN power is "passed through" to reader ports.
J7 - Reader power select
TB8 OR TB9
GND
DAT/D0
CLK/D1
BZR
LED
VO
Reader
Hardware Installation Guide
TB8 OR TB9
GND
GND
TR- (A)
DAT/D0
TR+ (B)
CLK/D1
POWER
VO
2-wire RS-485
Device
193
revision 7 —
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