Keri Systems NXT 4x4 User Manual

NXT 4x4

TB24

TB25

TB22

TB23

TB21

J23

Relay

IO Minus (White)

Power (Red)

Ground (Black)

321

Ground Input NC - Relay Common - Relay NO - Relay

NO - Relay

Common - Relay

NC - Relay

Input

Ground

Port 3

Port 4

Port 1

P/N: 01998-002 - Rev. E

IO Plus (Green)

NO - Relay

Common - Relay

NC - Relay

Input

Ground

Port 2

Ground Input NC - Relay Common - Relay NO - Relay

JP1

RS-485

J24

PCB Earth Ground Lug

cde

fghi

NXT-4x4

Installation Drawing

Tamper Switch Input

Shielded 4-Conductor CablingShielded CAT-5 Cabling

Blue with Stripe

Brown/Green/Orange w/o Stripe

Brown/Green/Orange with Stripe

Blue

total

cable length

500 feet max

(150 m)

Installation Guide

Section 1 – Wiring and Layout Diagrams Section 2 – Specifications and Cable Requirements Section 3 – Keri Contact Information

1.0 Wiring and Layout Diagrams

1.1 NXT-4x4 I/O Module

See Table 1 on page 2 for LED definitions.

NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Page 1 of 4 P/N: 01998-001 Rev. G

NXT 4x4

Installation Guide

Table 1: 4x4 LEDs

Power Purpose LED Future Application Purpose LED

indicator a undefined b

Utility Purpose LED Relay State Purpose LED

RS-485 Tx c Bus 1 f User 1 d User 2 e

Bus 2 g Bus 3 h Bus 4 i

2.0 Specifications

2.1 NXT-4x4 Dimensions

• 4x4 PCB

- 5.25 inches tall by 3.10 inches wide by 1.00 inches deep, not including wiring connectors

- 13.33 cm by 7.87 cm by 2.54 cm

• 4x4 Enclosure

- 8.00 inches tall by 7.00 inches wide by 2.75 inches deep

- 20.32 cm by 17.78 cm by 6.98 cm

2.2 Power Requirements

• 10 to 14 VDC @ 0.5 A (maximum current draw for a fully loaded NXT-4x4)

2.3 Current Requirements at 12 VDC

• 250 mA max for each NXT-4x4

NOTE: If you are driving an electronic locking device (magnetic lock, door strike, etc.) using the same power supply as the 4x4, ensure the power supply provides enough current to drive every device connected, including an adequate safety margin.

2.4 Relay Contact Rating

• 1 A @ 24 VDC

2.5 Operating Conditions

• 32°F to 150°F (0°C to 60°C) – 0% to 90% Relative Humidity, non-condensing

2.6 Cable Options

RS-485 bus runs can daisy-chain together an NXT-4x4 and NXT-Reader on one line. The total cable run distance should be less than 500 feet from the NXT controller for runs with 4x4s and less than 1,000 feet for Reader-only runs.

NOTE: Cable resistance causes a dr op in voltage at the end of long cable runs. Ensure the appropriate power and current for your device is available at the device at the end of the cable run. Heavier gauge cable reduces this affect.

NOTE: Keri does not recommend hot-plugging a Reader, RIM, or 4x4 into an NXT controller. Remove power from the controller prior to connecting these devices.

Page 2 of 4 P/N: 01998-001 Rev. G



+ 2 hidden pages