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36
Overview of the LNL-4420
This installation guide is intended for use by technicians who will be installing and maintaining the
LNL-4420 Intelligent Dual Reader Controller (IDRC).
The Intelligent Dual Reader Controller (IDRC) board provides decision making, event reporting, and
database storage for the Lenel hardware platform. An on-board dual reader interface provides control for up
to two single reader doors. The controller communicates with OnGuard via the on-board 10-BaseT/
100Base-TX Ethernet port.
Each reader port can accommodate a read-head that utilizes Wiegand, magnetic stripe, or 2-wire RS-485
electrical signaling standards, one or two wire LED controls, and buzzer control. Four Form-C relay outputs
may be used for strike control or alarm signaling. The relay contacts are rated at 5 A @ 30 VDC, dry contact
configuration. Eight (8) inputs are provided for monitoring the door contacts, REX inputs, and alarm
contacts. The LNL-4420 requires 12-24 VDC for power.
36.1
Interfaces
The IDRC interfaces upstream with the access control software host system.
Configuration data and event/status reports are exchanged with the host via 10-BaseT/100BaseTX Ethernet
interface (Port 0). Additional I/O devices are communicated to via the downstream communication ports, 2-
wire RS-485. The controller supports 64 downstream devices total (32 devices per downstream port).
The LNL-4420 has an on-board reader interface device capable of supporting up to two readers. When on-
board reader(s) are configured, these count as one (1) of the downstream devices.
Hardware Installation Guide
187
revision 7 —
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