ZKTeco SLK20M User manual

User Manual
SLK20M Embedded Optical Fingerprint Module
Version: 1.0
Date: October 2021

Preface
Thank you for choosing our product SLK20M Embedded Optical Fingerprint Module. Please read this User Manual
carefully before use.
We strongly believe that Embedded Optical Fingerprint Module brings you and your customers an excellent user
experience and will uplift your Brand Image and the Management to a higher level.
Considering the stability of the product quality and service life, please do not intentionally dismantle the product
or modify the system settings without professional instructions. For further queries, please contact the local
dealers.

Content
1. Introduction................................................................................................................................................. 1
2. Dimensions .................................................................................................................................................. 2
3. Technical Specifications...........................................................................................................................3
4. Technical Features.....................................................................................................................................5
5. Installation on Host (Devices).................................................................................................................6
6. Demo Testing Procedure.........................................................................................................................7
7. Operating Instructions .......................................................................................................................... 15

Page 1
1. Introduction
SLK20M, as one of the smallest embedded optical modules in the world combines a 2-megapixel image sensor
with an ARM9 processor for powerful performance. With the sophisticated design, it can be flexibly integrated
with various system applications without any additional accessories.

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2. Dimensions
PIN 1 2 3 4 5 6 7
Detail +5V GND Shield
USB
D-
USB
D+
UART UART
Connector Pin 1
LED Indicator
Fingerprint Sensor

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3. Technical Specifications
Sensor Type Optical
CPU 280MHz DSP
Flash 32 MB
SoC RTOS
Image Quality 2-megapixel CMOS
Encrypted Fingerprint Data Yes
Sunlight Operation Yes, Dark Field and Automatic Gain / Exposure
Water Splash Proof Yes
Power Consumption 5V: 200mA Scanning; 5V: 60mA idle (waiting for finger)
Fingerprint Liveness Detection Yes
LED White
Product Certifications FCC, CE, RoHS
Power Voltage 5V (USB) / 3.3V (TTL-RS232)
Power Current 200mA
Communication UART (115,200 bps / TTL3.3V) / USB 2.0

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Interface Socket Molex 51021- 0700 (7 pin; 1.25 mm)
Effective Collecting Area 15.24 * 20.32 mm (FAP20)
Collecting Area 16.5 * 23 mm
Dimensions (L*W*H) 36.2 * 44.2 * 15.85mm
Template ZKFinger V10.0 ; ISO19794-2 ; ANSI-378
Template Size 1-4KB (ZKFinger V10.0); 1,568 B (ISO 19794-2)
Capacity 2,000 templates
Grayscale 256
Weight 0.032kg
Operating Environment -20 °C ~ +50 °C; 90% r.h.
ISO/ANSI Support ISO-19794-2/4 ANSI-378

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4. Technical Features
Easy integration with smallest size without any extra accessories
Stable operation under strong light source
Durable glass touch surface
Quick scan with dry, wet and rough fingerprints

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5. Installation on Host (Devices)
Install the module on the device, as shown below, by tightening the four screws in the holes and linking the
holder to the wire.
Note: In order to ensure good and convenient fingerprint scanning, it is recommended to install the module on
the wall horizontally or at an angle of 0-45 degrees.

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6. Demo Testing Procedure
It is required that the first time Users need to install the Device Driver before using the Fingerprint Scanner, and
the process is as follows: (If the Users have already installed the Device Driver of SLK ID series Fingerprint Scanner,
they can directly test without re-installing it.)
1. Download the ZKFinger SDK compressed package and then double-click the setup.exe file to open.

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2. On the Setup Wizard, click Next and then click Install to install the driver.

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3. After the completion of the Driver installation click Finish.
4. Connect the Fingerprint Scanner Device to the Computer and go to Control Panel and open Device
Manager. If the driver is installed successfully, the Device Name will be displayed on the Computer
Management window.

Page 10

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5. Once after the installation of the Device driver, open Demo interface from ZKFinger SDK compressed
package, and then click Connect Sensor to connect with the Fingerprint Scanner.

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6. After the Sensor is connected, the Sensor Count is automatically displayed as 1. (It's equivalent to a user ID.
and we can set it on User ID, when we need to register many User.

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7. The default ID of the system is 1. Click Register and press the finger three times on the Fingerprint Scanner
to Register and click Save Image.

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8. After successful Registration, click Identify (1:N) and press the registered finger on the Fingerprint Scanner
for verification.

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Vertical (not flat)
Note: The finger needs to be pressed flatly and placed
accurately over the Sensor area.
Too close to the edge
7. Operating Instructions
Guide to Place the Finger
It is recommended to use the index finger, middle finger or the little finger for registration.
Proper Positioning of Finger
Improper Positioning of Finger

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Crooked Too low or high
Cautions
1. Make sure the fingers are clean when using the Fingerprint Scanner.
2. Place the finger correctly.
3. Recommended to use the index, middle or little fingers for Registration.
4. Please avoid using the thumb and pinky fingers, because these two are clumsy when pressing on the
Semsor Area.

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Suggestions
1. Please keep the sensor away from dust.
2. Please use adhesive tape to clean the Sensor area.
Do not use water or other detergents, which may damage the sensor.
3. Please use a wool-free cloth to wipe the Sensor area.
4. Please make sure the Sensor area is clean after each use.
Possible Complications
Some issues may cause difficulties to recognize the Registered fingers or during new Registration. They
are:
1. Smoothed out fingers;
2. Too many wrinkles on fingers;
3. Layer of any material on fingers;
4. Extremely dry and wet fingers.