The input interface enables system integrators to monitor sensors and control external
devices. It includes:

• Sixteen supervised or unsupervised inputs for monitoring door position, request-to-exit devices, and other alarm points.

• Two Form-C relay outputs for load switching.

• Two digital inputs for cabinet tamper and power fault status monitoring.

Input Interface Components

Supplying Power to the Input Interface

The input interface accepts 12 to 24V DC for power on TB11 (VIN and GND).

• Locate the power source as close to the input interface as possible.

• Use a minimum of 18 AWG wire.

• The VOUT terminal on TB11 provides the same voltage as VIN.

Communication Wiring

The input interface communicates with a controller over a 2-wire RS-485 interface supporting multi-drop communication on a bus of up to 4,000 feet (1,200 m). Use a twisted-pair cable (minimum 24 AWG) with drain wire and shield. See input interface specifications.

Alarm Contact Wiring

There are sixteen inputs that are typically used to monitor door position, request to exit or alarm contacts. Input circuits can be configured as:

• Unsupervised (2 states): Reporting as open or closed contact.

• Supervised (6 states): Reporting as open or closed contact, open circuit, shorted circuit, grounded circuit*, or foreign voltage*. (*Grounded and foreign voltage states are not a requirement of UL 294 and therefore not verified by UL.)

By default, inputs configured as supervised require two 1 kΩ, 1% resistors installed as close to the sensor as possible to ensure proper circuit supervision. Custom end-of-line (EOL) resistances can be configured via the host software.

Inputs for Cabinet Tamper/Power Fault

Input TMP and input FLT are used for monitoring cabinet tamper and power failure with normally closed contacts. These two inputs are for contact closure monitoring only, and do not use EOL resistors.

Control Output Wiring

The input interface provides two Form-C relay contacts for controlling door strikes or other connected devices. When switching loads, especially inductive loads such as strikes, abnormal contact wear and premature contact failure can occur. Inductive loads can also generate electromagnetic interference (EMI), which may affect the operation of nearby equipment.

To improve reliability and extend relay life, always install a contact protection circuit. The following two circuits are recommended. The circuit should be placed as close to the load as possible (within 12 inches [30 cm]). Installing it farther from the load reduces its effectiveness. Use wire gauges that are appropriately sized for the load current to prevent voltage drop.

Diode selection

• Diode current rating > 1x strike current

• Diode break down voltage: > 4x strike voltage

• For 12 V DC or 24 V DC strike, diode 1N4002 (100V/1A) typical

DIP Switch and Jumper Usage

Switches 1 to 5 select the device address. Switches 6 and 7 select the communication baud rate. All other configuration settings are set via host software.

* DIP switch 8 (S8) is reserved and not used.

Jumpers

Jumper J3 - RS-485 termination, install in first and last units only.

Factory Reset

While not normally required, it is possible to perform a factory reset of the input door interface, which deletes all onboard stored data. To perform the delete:

1. Set all DIP switches to OFF.

2. Remove power from the input interface.

3. Restore power to the input interface.

4. Within 3 seconds, toggle DIP switch 8 ON.

Status LEDs

Power-up

All LEDs are OFF.

Initialization

Once power is applied, initialization of the module begins.

When initialization is completed, LEDs 1 through 16, TMP, FLT, A and B are briefly sequenced ON then OFF.

Run Time

After a successful initialization, the LEDs have the following meanings:

Specifications

Revision E assembly: The input interface is for use in low voltage, class 2 circuit only.

• Primary power: 12 to 24 V DC ± 10%, 350 mA maximum

• Outputs: Two Form-C relays: 

  • Normally open contact (NO) contact: 5 A @ 30 V DC resistive

  • Normally closed contact (NC) contact: 3 A @ 30 V DC resistive

• Inputs:

  • 16 unsupervised/supervised, standard EOL: 1k/1kΩ, 1%, ¼ watt

  • Two unsupervised, dedicated for cabinet tamper and UPS fault monitoring

• Communication:

  • RS-485, 2-wire. 38400 or 115200 bps

• Cable requirements (all ports shall use shielded conductors):

  • Power: One twisted pair, 18 AWG

  • RS-485 I/O devices: One twisted pair with drain wire and shield, 24 AWG, 120Ω impedance, 4,000 feet (1,200 m) maximum

  • Alarm inputs: One twisted pair per input, 30Ω maximum

  • Outputs: As required for the load

• Mechanical:

  • Dimension: 6 inches (152 mm) W x 8 inches (203 mm) L x 1 inch (25.4 mm) H

  • Weight: 7.8 oz. (220 g) nominal

• Environmental:

  • Temperature:

    • Storage: -55 to +85°C

    • Operating: 0 to +70°C

  • Humidity: 5 to 95% RHNC

Performance Levels

UL 294, 8th edition Performance Levels

These specifications are subject to change without notice.

Liability

The Interface should only be used to control exits from areas where an alternative method for exit is available. Thisproduct is not intended for, nor is rated for operation in life-critical control applications. LenelS2 is not liable under any circumstances for loss or damage caused by or partially caused by the misapplication or malfunction of the product. LenelS2’s liability does not extend beyond the purchase price of the product.

Regulatory

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

The input interface board must be powered by an NRTL (Nationally Recognized Testing Laboratory) approved by Class 2 Listed Power Supply. Expansion port and supervised input functionality were not evaluated by UL.

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