KERI Systems KERI3000 Users Manual

NXT-1R/-3R/-5R Reader

IO-Minus (White)

IO-Plus (Green)

Ground (Black)

+12 VDC (Red)

Shield (Silver)

Reader Body

Beeper

Total cable length

no greater than 1,000 feet (300 m)

RS-485

P/N: 01999-002 - Rev.B

LED

NXT-1R/-3R/-5R Installation Drawing

Installation Guide

Section 1 – Wiring and Layout Diagrams
Section 2 – Specifications and Cable Requirements
Section 3 – Reference Documentation List
Section 4 – Keri Contact Information

1.0 Wiring and Layout Diagrams

1.1 NXT-1R/-3R/-5R Readers

• 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.

• Changes to this equipment not expressly approved by Keri Systems, Inc. may void FCC certification and the user’s authority to operate
this equipment.

• Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference,
including interference that may cause undesired operation of the device.

2.0 Specifications

2.1 NXT-Reader Dimensions

• NXT-1R Euro Mount Prox Reader

- 3.25 inches tall by 3.25 inches wide by 0.5625 inches deep, not including wiring connectors

- 8.25 cm by 8.25 cm by 1.43 cm

• NXT-3R Mullion Reader

- 3.75 inches tall by 1.625 inches wide by 0.50 inches deep

- 9.52 cm by 4.13 cm by 1.27 cm

• NXT-5R Wall Switch Reader

- 4.50 inches tall by 3.00 inches wide by 0.625 inches deep, not including wiring conn ectors

- 11.43 cm by 7.62 cm by 1.59 cm

2.2 Power/Current Requirements

• 10 to 14 VDC @ 120 mA (maximum current draw at 12 VDC)

Page 1 of 2 P/N: 01997-003 Rev. A

NXT-1R/-3R/-5R Reader

Installation Guide

2.3 Operating Conditions

• -40°F to 150°F (-40°C to 65°C) – 0% to 90% Relative Humidity, non-condensing

2.4 Cable Requirements

RS-485 bus runs can daisy-chain together an NXT-4x4 and NX T-Reader on one line. However , the total distance for this
run can be no greater than 1,000 feet from the NXT controller.

NOTE: On long cable runs, cable resistance causes a drop in voltage at the end of the cable run. Ensure the appropriate
power and current for your device is available at the device at the end of the cable run.

Table 1: Cable Requirements

Connection

RS-485 bus from

NXT-2D/-4D to NXT-

4x4 (with or without

1R/-3R/-5R Readers)

RS-485 bus from NXT-

2D/-4D to 1R/-3R/-5R

Readers only

a. Heavier gauges then those listed are always acceptable.

Total Run

Length

1,000 feet 4 Y Y Y 16 TBD

500 feet 18 TBD
250 feet 22 TBD

1,000 feet 4 Y Y Y 20 TBD

500 feet 22 TBD
250 feet 26 TBD

# of

Conductors

Shielded Stranded

Twisted

-Pair

AWG

3.0 Product Documentation

All Keri technical documentation can be found on the Keri CD in the Technical Documentation folder
or online at http://www.kerisys.com/pages/download/techdocs.asp.

4.0 Contact Keri Systems

Keri USA Keri UK, Ireland, Europe

a

Equivalent

Belden

2305 Bering Drive

San Jose, CA 95131

T elephone: [phone]

[phone]

Fax: [phone] Fax:+ 44 (0) 1763 274 106

Web: www.kerisys.com Web:www.kerisystems.co.uk

E-mail: [e-mail]

[e-mail]

- End of document. -

Page 2 of 2 P/N: 01997-003 Rev. A

Park Farm Industrial Estate

Telephone: + 44 (0) 870 444 7234

E-mail:[e-mail]
[e-mail]

Unit 17

Ermine Street

Buntingford

Herts SG9 9AZ UK