This document contains basic information for the installation of the NXT-MSC
(Mercury-Powered) 2D (2-door) and 4D (4-door) controllers.
Notes:
Keri Public Statement on the Amazon Key
Keri Systems, Inc. has updated its policy regarding the integration of
We are pleased to inform you that Amazon has now provided official installation
This change reflects our commitment to supporting secure and flexible access solutions
Please note the following:
Keri Systems remains dedicated to providing robust access control solutions.
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• NXT 2D/4D controller PCB
- 6.75 inches high by 6.00 inches wide by 1.75 inches deep, including wiring connectors
- (17.15 cm by 15.25 cm by 4.45 cm)
• Enclosure
- 13 inches high by 9 inches wide by 4 inches deep - (33.02 cm by 22.86 cm by 10.16 cm)
• Operating Temperature/Humidity Range
- 32°F to 150°F (0°C to 60°C)
- 0% to 90% Relative Humidity, non-condensing
Input Power
• 10 to 14 VDC @ 2.5 A (maximum current draw for a fully loaded NXT-2D/-4D controller)
Output Relay Contact Rating
• 1 Amp @ 24 VDC
Current Draw Requirements as 12VDC
• 650 mA max for an NXT-4D Controller
• 570 mA max for an NXT-2D Controller
• 210 mA max for each NXT-4x4
• 85 mA max for each NXT-1R, NXT-3R, NXT-4R, or NXT-5R Reader
• 115 mA max for each NXT-6RK Reader
• 50 mA max for each NXT-RM Reader Interface Module
Note: Keri recommends using separate, linear power supplies for the controller and the electronic locking device (magnetic lock, door strike, etc.). Should you decide to use the same linear power supply for both the controller and the electronic locking device, ensure the linear power supply provides enough current to drive the controller, the locking device, and any peripherals that may be connected (i.e., reader, 4x4, RIM), including an adequate safety margin.
• Door Sense - normally closed
• Request to Exit - normally open
• Global Unlock - normally open,
or Auxiliary RTE A-Door - normally open
• 5 year lithium battery back up to support controller RAM and real-time clock.
The controller 3v backup battery is a CR2032.
NXT2D Controller
* 4 Reader capacity requires the Mercury Firmware option and two NXT Exit Readers
NXT4D Controller
* 8 Reader capacity requires the Mercury Firmware option and four NXT Readers
See the table in section 6.0 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.
Important Notes:
Add transient suppression across electric devices attached to a controller output.
Use an isolation relay (IRP-1, or equivalent) when attaching to a parking gate, a
turnstile, or any application using a large electric motor.
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.
Note: The transorbs that Keri provides are non-polar; they can be installed in either orientation.
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.
Purpose | LED | LED Behavior |
Network Activity LEDs | a and b (D21 and D22) | Indicates that the controller is connected to the local area network. When the controller is connected to the network LED a (D21) will be quickly flashing green and LED b (D22) will be solid red. |
| c (D48) - CFG RST | c (D48) - Controller heartbeat indicator - this LED will blink red approximately once every second to indicate the controller is healthy and functioning correctly. |
d (D49) - D MODE | d (D49) - Gateway communications LED - this LED flickers green every few seconds to indicate the controller is online to the MSC gateway. This LED also flashes quickly when a controller firmware upgrade is in progress. | |
e (D50) - ULED1 | e (D50) - UART - Port 1 traffic indicator - solid red when the controller is communicating to device on bus 1. | |
f (D51) - ULED2 | f (D51) - UART - Port 2 traffic indicator - solid red when the controller is communicating to device on bus 2. | |
g (D52) - ULED3 | g (D52) - UART - Port 3 traffic indicator - solid red when the controller is communicating to device on bus 3. | |
h (D53) - ULED4 | h (D53) - UART - Port 4 traffic indicator - solid red when the controller is communicating to device on bus 4 | |
RS-485 bus overcurrent LEDs (Note: A 2-door controller does not have LEDs k (D56) or l (D57).) | i (D54) - Bus 1 Over Current | i (D54) - Solid red when bus 1 is drawing too much current and has shut-down. |
j (D55) - Bus 1 Over Current | j (D55) - Solid red when bus 2 is drawing too much current and has shut-down. | |
k (D56) - Bus 1 Over Current | k (D56) - Solid red when bus 3 is drawing too much current and has shut-down. | |
l (D57) - Bus 1 Over Current | l (D57) - Solid red when bus 4 is drawing too much current and has shut-down. | |
RS-485 bus communication LEDs |
| These LEDs flash green quickly when the controller is communicating to a device. If there is no device or communication on a particular bus then the LED will blink green approximately once every 2 seconds. Notes: • A 2-door controller does not have LEDs O (D11) or • These LEDs will also be solid green when the controller is in a factory reset state and has no access control configuration in memory. |
Relay state LEDs |
| These LEDs are solid red when the corresponding relay is activated. For example, using the default controller settings, D3 LED will be solid red when door 1 is unlocked.
Note: A 2-door controller does not have LEDs s (D13) or t (D18). |
Thermal fuse LED | u (D23) | If LED u (D23) is green, the power wires are reversed; if LED u is red, the unit is drawing too much current. |
Power LED | v (D26) | The v (D26) LED is solid green when the controller is receiving the correct input power. |
Note: Screws on terminal blocks must be tightened securely.
Note: TB2 is colored red to make it easier to tell it apart from the other connectors.
To ensure optimum earth-grounding of the controller and its connected peripherals, you should make a quality earth-ground connection to the metal enclosure lug (which displays an adjacent earth-ground symbol).
This good-quality earth-ground at the enclosure lug will provide an earth-ground for the entire enclosure - and will therefore ground anything that is connected to the metal enclosure - (the four metal screws at each corner of the PCB) - plus, through circuitry on the PCB, this includes anything connected to the lug marked J6 or pin 3 of the TB10 power connector.
In addition, the enclosure itself must be earth grounded to a good quality ground point external to the enclosure for a complete path to ground.
The shield/drain wire of any reader/peripheral cables MUST be terminated to one of the following points: any corner screw attaching the controller to the enclosure, Pin 3 of TB10, the green ground lug (J6) on the controller, or the ground lug of the enclosure. Failure to properly earth ground the reader/peripheral drain wire may result in unreliable communication or operation of the attached peripheral.
Notes:
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 two Readers or one Reader and one 4x4, and less than 1,000 feet for single Reader runs.
Recommended NXT Reader and 4x4 Cable Options
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 be damaged easily - making the system more susceptible to EMI.
Connection | Total Cable Run Length | # of Conductors | Shielded? | Stranded? | AWG |
Controller Power | 250 feet [a] | 2 | N | Y | 18 |
Earth-Ground | Shortest path [b] | 1 | N | N | 18 |
Inputs and Outputs | 500 feet | 2 | N | Y | 22 |
Notes:
Single conductor, AWG 18 wire (or a larger gauge). Ground wire is green with or without yellow tracer.
Four to seven conductor, shielded, stranded, wire – depending upon the Wiegand reader’s requirements. A minimum gauge of AWG 24 is required for data transfer with a 500-foot maximum run length per Wiegand specification.
NXT reader extension cable type is: Belden 9841 or equivalent (one twisted pair) for data combined with Belden 8461 or equivalent for the 18x2 power cable or Belden 8723 or equivalent (two twisted pairs in one jacket).
Note: CAT5/CAT6 cable can be used but is not recommended because it is more brittle than shielded, stranded cable and is therefore more susceptible to being damaged.
The shield/drain wire of any reader/peripheral cables MUST be terminated to one of the following points-any corner screw attaching the controller to the enclosure, Pin 3 of TB10, the green ground lug (J6) on the controller, or the ground lug of the enclosure. Failure to properly earth ground the reader/peripheral drain wire may result in unreliable communication or operation of the attached peripheral.
Keri recommends resetting NXT-MSC controllers the first time these controllers are powered on.
Note: Resetting an NXT controller with Mercury firmware 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. Keri recommends resetting NXT controllers the first time these controllers are powered on.
Perform the following to reset an NXT controller with Mercury Firmware:
When an end user enters the web browser configuration interface and changes the password from the default to a unique value, the default password is disabled. Should the unique password be lost, the user is locked out of the web browser. The new firmware provides a temporary window of access for the web browser, provided you can access the controller itself. This access method is available in controllers with firmware v1.01.40 and greater.
On the controller, press S1 twice to start a five minute window in which the default password is enabled allowing the web browser to access that controller. After five minutes the default password is disabled and the unique password is enabled.
Keep in mind, a hardware reset will restore the factory default web browser password, as well as
manually resetting the controller to factory default values.