NXT 6RK Reader and Keypad Installation Guide

NXT 6RK Reader and Keypad Installation Guide

1.0 Introduction

The Keri NXT-6RK is a keypad reader typically used for card + PIN dual verification applications. It transmits keypad data in either 8-bit burst (default) or 26-bit Wiegand formats and can be used as a keypad-only device. Since the NXT-6RK communicates via Wiegand format it requires an NXT-RIM for operation.

Important Note: The standard NXT-6RK is NOT compatible with 125KHz HID credentials. For 125KHz HID compatibility you would need to order the NXT-6RK-H version.

2.0 Specifications

2.1 NXT-Reader Dimensions
4.6 inches tall by 3.0 inches wide by 0.7 inches deep
11.7 cm by 7.7 cm by 1.8 cm

2.1 Power/Current Requirements
10 to 14 VDC @ 115 mA (maximum current draw at 12 VDC)

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

2. 4 Read Range
w/NXT-C - up to 6 inches (15.2 cm)
w/NXT-I/S - up to 4 inches (10.2 cm)
w/NXT-K - up to 3 inches (7.6 cm)

Read range is stated in a clean RF and electrical environment using credentials presented parallel to
the reader surface with the reader operating at 12 VDC. Read range may be affected by local
installation conditions. Read range will be reduced when mounted on metal.

Note: The equivalent read-range values are very similar when using 125KHz HID credentials with the NXT-6RK-H.

2.5 Keypad Formats
8-bit burst (default)
26-bit Wiegand
The Keypad format can be toggled between 8-bit burst and 26-bit Wiegand using the KeypadDataMode card that is provided with the keypad. Present this card within 60 seconds of power up to toggle between states.

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.

2.6 Cable Options

Table 1: Cable Requirements

Total Run
# of Conductors
AWG  (a)
RIM to
500 feet (b)

a. Heavier gauges than those listed are always acceptable.
b. Run lengths greater than 500 feet are not supported.

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. 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.

3.0 Installation Drawing

4.0 Wiring and Configuration Drawing

NXT-6RK to RIM Wiring and Configuration Drawing

Table 2: NXT-6RK to RIM Wiring

5.0 RIM Configuration

The default RIM configuration is for an MS-Series Reader using two line LED control (multi-color).

Perform the following steps to configure the RIM for the NXT-6RK Keypad Reader. Refer to the Wiring and Configuration Drawing on page 3 for switch and LED locations, and Table 2 on page 5 for switch and LED definitions.

5.1 Enter Configuration Mode

1. Hold down both SW1 and SW2 for about two seconds.
2. All seven LEDs on the RIM will flash three times.
3. Release both SW1 and SW2, and the RIM is now in configuration mode.

5.2 Configure the RIM

The RIM is configured for the NXT-6KR when the Reader Type LED (D6) is set and the Reader LED
Configuration LED (D2) is set.

1. First the RIM allows you to configure the Reader Type.
2. Press SW1 to step through the supported reader types. Each press of SW1 will step to the next
reader type.
3. When the D6 LED is lit, press SW2. The reader type is now set.
4. Now the RIM is ready to configure the Reader LED Configuration.
5. LED D2 should be lit indicating the RIM is set in it’s default mode. This is the correct mode for
the NXT-6RK Keypad Reader. If D2 is not lit, press SW1 to step through the supported LED line
configuration types. Each press of SW1 will step to the next LED configuration type.
6. When the D2 LED is lit, press SW2. The LED line control mode is now set.
7. The RIM is now configured and it reboots to accept the new parameters. The RIM’s LEDs will be
off for about 10 seconds as the unit resets itself. All seven LEDs will flash as the unit is rebooting
with the new configuration parameters. When the LEDs stop flashing, the unit is operational.

Note: Do not remove power from the RIM during the reboot process. Loss of power during
rebooting will invalidate any configuration changes you have made.

5.3 Verifying RIM Configuration

The corresponding reader type and line control mode LEDs are illuminated during operation. Refer to
the Drawing on page 1 for switch and LED locations, and the Table on page 3 for switch and LED
definitions to confirm your configuration settings.

Table 3: NXT-6RK to RIM Wiring

Reader Type
Keri MS Series
Keri factory default setting
Wiegand Reader/Keypad Combo

LED Control
single wire LED control – red, green, amber, off
two wire LED control – red, green, amber, off Keri factory default setting
D3 (a)
single wire LED control – red, green, off standard setting for Wiegand Readers using a single wire to drive the LED (no amber)

Communication Active
RS-485 Bus

J2 Reader Power Setting
lit when set for 12 VDC reader power

(a). This table is valid for RIM Firmware v03.01.06 and later. Please upgrade your firmware as necessary.

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