Keri Systems NXT_2D 4D_Controller_Installation_Guide_I NXT 2D And 4D Installation Guide Controller

User Manual: Keri Systems NXT-2D and NXT-4D Installation Guide Installation Guide

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NXT 2-D/4-D Controller
Installation Guide

1.0

Wiring and Layout Diagrams

1.1

NXT-2D/-4D Controller
NXT-2D/4D Installation Drawing
Power Ground

TB5, TB6, TB7, TB8,
U34, U35, and Relays
ARE NOT INSTALLED
on 2-Door Controllers

+12 VDC

Earth Ground

PCB Earth Ground Lug

Power LED

s

3 2 1

Battery
(Red) +12 VDC
(Black) Ground
(Green) IO-Plus
( White) IO-Minus

1

r

2

Thermal Fuse
LED

4

TB5

NO - Relay
Common / Door Lock - Relay
NC - Relay
Door Switch - Input
Ground
Port 3
REX - Input

1

TB6

(Red) +12 VDC
(Black) Ground
(Green) IO-Plus
(White) IO-Minus

1

NO - Relay
Common / Door Lock - Relay
NC - Relay
Door Switch - Input
Ground
Port 4
REX - Input

1

6
5
4
3

U34

Relay

J9

2

2
1

J8

3
4

U33

TB3
Relay

5
6

2
3

TB4

TB2

TB7

4

TB8

2
3

J10

4

Relay

Tamper
Switch

Relay

J1

J7

4
3
2
1
6
5
4
3
2
1

TB1
U32

Bus 4
RS-485

3

U35

Bus 3
RS-485

J6
TB10

5
6

4
3
2
1

Ethernet
Direct Connection

TX-Minus
TX-Plus
RX-Minus
RX-Plus

1
2
3
4

TB9

Utility LEDs

REX - Input
Port 2
Ground
Door Switch - Input
NC - Relay
Common / Door Lock - Relay
NO - Relay
IO-Minus (White)
IO-Plus (Green)
Ground (Black)
+12 VDC (Red)

RS-485
Bus 2

REX - Input
Port 1
Ground
Door Switch - Input
NC - Relay
Common / Door Lock - Relay
NO - Relay
IO-Minus (White)
IO-Plus (Green)
Ground (Black)
+12 VDC (Red)

RS-485
Bus 1

Overcurrent LEDs

d e f g h i t u vw
J2
abc

j k lm nopq
S1

Ethernet RJ-45 Connection

Ethernet
Activity LEDs

J3
RS-485 Bus
Activity LEDs

Relay State
LEDs

P/N: 01997-002 - Rev. D

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 may cause harmful interference in which case the
owner will be required to correct the interference at the owner’s expense.

Page 1 of 6

P/N: 01997-001 Rev. I

NXT 2-D/4-D Controller
Installation Guide
1.2

LED Definitions Table
Table 1: NXT Controller LEDs a

Ethernet
Comm

Utility

RS-485 Bus

Purpose

LED

10/100

Relay State

Purpose

LED

a (D21)

Relay 1 active

n (D3)

Link

b (D22)

Relay 2 active

o (D8)

Activity

c (D33)

Relay 3 active

p (D13)

Purpose

LED

Relay 4 active

q (D18)

Standard FW
Config Reset

d (D48)

Purpose

LED

Host Channel Active

e (D49)

indicator

r (D26)

Firmware Upgrade

f (D50)

Event Channel Active

g (D51)

Purpose

LED

unused

h (D52)

indicator

s (D23)

Mercury FW
Config Reset

i (D53)

Purpose

LED

Purpose

LED

Bus 1 Tx

j (D1)

Bus 1 Over Current

t (D54)

Bus 2 Tx

k (D6)

Bus 2 Over Current

u (D55)

Bus 3 Tx

l (D11)

Bus 3 Over Current

v (D56)

Bus 4 Tx

m (D16)

Bus 4 Over Current

w (D57)

Power

Thermal Fuse b

RS-485 Bus c

a. PCBs at revision F or greater have the RS-485 Bus Over Current LEDs t, u, v, and w. PCB revisions earlier
than revision F do NOT have these LEDs.
b. If LED s is green, the power wires are reversed; if LED s is red, the unit is drawing too much current.
c. If LED t, u, v, or w is red, that individual bus is drawing too much current and the bus is shut down to protect
the controller. When this condition is corrected, the LED will turn off and the bus will be activated.

Page 2 of 6

P/N: 01997-001 Rev. I

NXT 2-D/4-D Controller
Installation Guide
1.3

Port Protection

Transorbs are provided with the controller ship kit. They are used to protect the controller from voltage spikes induced on
the port wiring by absorbing the excess voltage and slowly releasing it back into the circuit. Keri strongly recommends
wiring in the transorbs provided with the controller ship kit. Refer to the Transorb Wiring Diagram below.

NO - Relay
Common - Lock / Alarm - Relay
NC - Relay
Door Switch - Input
Ground
REX - Input

+ Fail-Secure
Electric Lock Device
or
Alarm
–

1
2
3
4
5
6

Port
Terminal Block

NO - Relay
Common - Lock - Relay
NC - Relay
Door Switch - Input
Ground
REX - Input

1

–

Power
Supply
+

+

2
3

–

4
5
6

Power
Supply

–

Port
Terminal Block

Fail-Safe
Electric Lock
+
Device

NOTE: The Transorbs that Keri provides are non-polar; they can be installed in either orientation.

1.4

Isolation Relays

For locking devices that may induce heavy voltage spikes – Mag Locks and devices with heavy-duty solenoids such as
turnstiles, vehicle gates, and overhead doors – Keri recommends using isolation relays. Keri has an Isolation Relay Kit 
(p/n IRP-1). Please refer to the IRP-1 Isolation Relay Installation Guide (p/n 01833-001) for detailed information.

Page 3 of 6

P/N: 01997-001 Rev. I

NXT 2-D/4-D Controller
Installation Guide

2.0

Specifications

2.1

NXT-2D/-4D Dimensions

•

•

2.2
•

2.3
•
•
•
•
•
•

NXT Controller PCB
- 6.50 inches high by 5.50 inches wide by 1.00 inch deep, not including wiring connectors
- 16.51 cm by 13.97 cm by 2.54 cm
NXT Enclosure
- 13.00 inches high by 10.5 inches wide by 3.00 inches deep
- 33.02 cm by 26.67 cm by 7.62 cm

Linear Power Supply Requirements
10 to 14 VDC @ 2.5 A (maximum current draw for a fully loaded NXT-2D/-4D controller)

Current Requirements at 12 VDC
650 mA max for an NXT-4D Controller
570 mA max for an NXT-2D Controller
250 mA max for each NXT-4x4
120 mA max for each NXT-1R, NXT-3R, NXT-4R, or NXT-5R Reader
115 mA max for each NXT-6RK Reader
100 mA max for each NXT-RM Reader Interface Module

NOTE: Keri recommends using separate power supplies for the controller and the electronic locking device (magnetic
lock, door strike, etc.). Only linear power supplies or Keri approved switching power supplies should be used for the
controller (refer to the Recommended Peripherals document – p/n 01924-001). Use isolation relays (Keri p/n IRP-1)
between the controller and the electronic locking device to prevent spikes or surges from the locking device from affecting
the controller.

2.4
•

2.5
•

2.6
•

2.7

Relay Contact Rating
1 A @ 24 VDC

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

Battery/Memory Retention
5-year lithium battery backup to support controller RAM and real-time clock

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 no more than 500 feet from the NXT controller for runs with 4x4s and no more than 1,000 feet for Reader-only runs.
Refer to Table 2 on page 5 and Table 3 on page 5.
NOTE: Cable resistance causes a drop 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 effect.
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 4 of 6

P/N: 01997-001 Rev. I

NXT 2-D/4-D Controller
Installation Guide

Table 2: Reader and 4x4 Cable Options

Connection Type

Total Run
Length

Minimum
AWG

Shielded,
Stranded,
2 TwistedPaira

Shielded,
Stranded,
4-Conductorc

CAT-5b

Suggest

Suggest

RS-485 bus 
from NXT-2D/-4D 
to NXT-4x4 only

up to
500 feet

18 - Power
22 - Data

Belden
8723

shielded

Windy City:
414302-S
Tappan:
1880AB4M-CM

RS-485 bus 
from NXT-2D/-4D 
to NXT-4x4 
and NXT Readers

up to
500 feet

18 - Power
22 - Data

Belden
8723

shielded

Windy City:
414302-S
Tappan:
1880AB4M-CM

RS-485 bus 
from NXT-2D/-4D 
to NXT Readers only

up to
1,000 feet

18 - Power
22 - Data

Belden
8723

shielded

Windy City:
416303-S
Tappan:
2280AB4M-CM

a. Keri recommends this cable type for best system performance.
b. Keri’s preferred low-cost option. Keri has no suggested vendor for this type of cable.
c. Use care when routing this type of cable as it can make the system more susceptible to EMI.

Table 3: Controller Power, Inputs, and Outputs Cable Requirements
Connection

Total Run
Length

# of
Conductors

Shielded

Stranded

AWG

Belden
Equivalent

controller power

250 feeta

2

N

Y

18

8461

earth ground

shortest
pathb

1

N

N

18

no specific
requirement

inputs and outputsc

500 feet

2

N

Y

22

no specific
requirement

a. To meet CE and C-tick regulations, the length of the controller power line can be no longer than 
3 Meters (9.85 feet).
b. Use the shortest possible path from earth ground point to PCB. Connect the earth ground only to the designated pin on the terminal block. This is important as all transient protection for the unit is made through this
earth ground connection. For unit protection, the earth ground connection should always be made first.
c. Values listed are minimums. Individual input and output devices may have more specific 
requirements.

Page 5 of 6

P/N: 01997-001 Rev. I

NXT 2-D/4-D Controller
Installation Guide

3.0

Resetting Controllers

Keri recommends resetting NXT controllers the first time these controllers are powered on. Also, under certain
circumstances NXT controllers may need to be reset.
NOTE: Resetting a standard NXT controller will restore the controller to a factory default state. It removes all network
configuration data assigned to the controller such as the IP Address, Subnet Mask, and Gateway address.

3.1
1.
2.
3.
4.
5.

Reset a Standard NXT Controller
Remove power from the NXT controller.
Ensure a Jumper is across the J3 header (refer to the drawing on page 1). The Jumper can remain on J3 at all times.
Press the S1 switch and hold it down while applying power. Keep the button pressed until the Reset LED (D48) is lit.
This indicates the reset routine has begun. Once the LED is lit, the button can be released.
DO NOT REMOVE POWER FROM THE NXT CONTROLLER WHILE THE RESET LED IS LIT.
The Reset is complete when the Reset LED goes off.

3.2
1.
2.
3.

Restore Configuration Information to a Reset Controller
In Doors.NET under Setup > Hardware Setup > Panels, click on the controller that was reset.
When the Communication field shows the controller is Online click the Update Network icon on the ribbon bar.
Click the Live Events tab and watch for the Update Network Completed event message. When this message is posted
the controller’s configuration information is restored.

4.0

Contact Keri Systems
Keri USA

Keri UK, Ireland, Europe

2305 Bering Drive
San Jose, CA 95131

Unit 17
Park Farm Industrial Estate
Ermine Street
Buntingford
Herts SG9 9AZ UK

Telephone: (800) 260-5265
(408) 435-8400

Telephone: + 44 (0) 1763 273 243

Fax: (408) 577-1792

Fax: + 44 (0) 1763 274 106

Web: www.kerisys.com

Web: www.kerisystems.co.uk

E-mail: sales@kerisys.com
techsupport@kerisys.com

E-mail: sales@kerisystems.co.uk
tech-support@kerisystems.co.uk
End of document.

Page 6 of 6

P/N: 01997-001 Rev. I



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