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Programming Guide
GT-GT-NUCL1633K1
Version 1.3
May 4th, 2022
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Version
Date
Description
V1.0
Nov 18, 2021
Created
V1.1
Nov 29, 2021
Modify Chapter 6 example
V1.2
Apr 29, 2022
Add UART, LED,Touch command.
Modify Enrolled/Identify Flow
V1.3
May 4th, 2022
Modify Get entry ID
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Revision History
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Table of content
Revision History .......................................................................................................................... 2
Table of content .......................................................................................................................... 3
1. Introduction ................................................................................................................................... 4
1.1 Fingerprinter ..................................................................................................................... 4
1.2 Feature .............................................................................................................................. 4
2. Packet Structure ............................................................................................................................ 5
2.1 Command Packet (Command) ......................................................................................... 5
2.2 Response Packet (Acknowledge) ..................................................................................... 5
2.3 Data Packet (Data)............................................................................................................ 5
3. Command Summary ....................................................................................................................... 6
4. ACK Code ........................................................................................................................................ 7
5. Command Details ............................................................................................................................ 8
5.1 Open ................................................................................................................................. 8
5.2 Close ................................................................................................................................. 9
5.3 UART Control .................................................................................................................. 9
5.4 LED Control ................................................................................................................... 10
5.5 Check finger pressing status(IsPressFinger) .................................................................. 10
5.6 Enroll .............................................................................................................................. 11
5.7 Delete one fingerprint(DeleteID) ................................................................................... 13
5.8 Delete all fingerprints(DeleteAll) ................................................................................... 13
5.9 Get enrolled fingerprint count(GetEnrollCount) ............................................................ 14
5.10 1:N Identification(Identify) ............................................................................................ 15
5.11 Get entry ID(GetEntryID) .............................................................................................. 16
5.12 Get firmware version ...................................................................................................... 16
5.13 Enroll Cancel .................................................................................................................. 17
6. Protocol: Flowchart ....................................................................................................................... 19
Example: Enrollment ...................................................................................................................... 19
Example: Identification .................................................................................................................. 20
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1. Introduction
1.1 Fingerprinter
The ADH-Tech GT-NUCL1633K1 is one chip fingerprint reader designed to integrate products with a
UART interface.
The module is built-in a high-quality hybrid sensor with sufficient effective area. The active area
allows stable imaging and the ability to cope with mass-market applications needing both security and
convenience. The reader within low power consumption microcontroller and the fingerprint algorithm
on it.
1.2 Feature
Sensor
Ultra-thin hybrid sensor
SPI sensor image output
Resolution up to 508 DPI
Works well with dry, wet, or rough fingerprints.
The sensor has an SPI interface. Ultra high resolution makes fingerprint algorithms easy to
develop and realize.
MCU/Algorithm
1:1 Verification, 1:N Identification
Reading & writing fingerprint template(s) from/to the device
High-accuracy and high-speed fingerprint identification technology
Convenient & Safe & Facilitation—Just one touch and easy to enroll and recognize.
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OFFSET
ITEM
TYPE
DESCRIPTION
0
0xF5
BYTE
Command start code1
1
command
BYTE
Command type
2
P1
BYTE
Command parameter 1
3
P2
BYTE
Command parameter 2
4
P3
BYTE
Command parameter 3
5
P4
BYTE
Command parameter 4
6
Check Sum
BYTE
XOR check Sum
OFFSET[1]^...^ OFFSET[5] = Check Sum
7
0xF5
BYTE
Command end code 2
OFFSET
ITEM
TYPE
DESCRIPTION
0
0xF5
BYTE
Response start code1
1
Command
BYTE
Often the same as the command type
2
Q1
BYTE
Response parameter 1
3
Q2
BYTE
Response parameter 2
4
Q3 (ACK)
BYTE
Response parameter 3
5
0x00
BYTE
Reserved.
6
Check Sum
BYTE
XOR check Sum
OFFSET[1]^...^ OFFSET[5] = Check Sum
7
0xF5
BYTE
Response end code2
OFFSET
ITEM
TYPE
DESCRIPTION
0
0xF5
BYTE
Data start code1
1~Len
Data
N BYTES
N bytes Data
Len+1
Check Sum
BYTE
XOR check Sum
OFFSET[1]^...^ OFFSET[Len] = Check Sum
Len+2
0xF5
BYTES
Data end code2
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2. Packet Structure
2.1 Command Packet (Command)
2.2 Response Packet (Acknowledge)
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2.3 Data Packet (Data)
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Number
(HEX)
Alias
Description
A0
Open
Initialization
A1
Close
Termination
B4
LED Control
LED On/Off
B5
Is Press Finger
Check if the finger is placed on the sensor
01
Enroll
An enrollment function
04
Delete ID
Delete the fingerprint with the specified ID
05
Delete All
Delete all fingerprints from the database
09
Get User Count
Get enrolled fingerprint count
0C
Identify
1:N Identification of the captured fingerprint image with
the database
0D
Get Entry ID
Get an unused ID
26
Get firmware version
Get firmware version
92
Enroll Cancel
Break the enrollment sequences
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3. Command Summary
In a command package, the second byte for the command code may be one of the following:
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ACK Parameter
Value
Description
ACK_SUCCESS
0x00
Command execute success
ACK_FAIL
0x01
Command execute fail
ACK_FULL
0x04
The database is full
ACK_NOUSER
0x05
The specified ID is unregistered
ACK_USER_EXIST
0x07
The specified ID is registered
ACK_TIMEOUT
0x08
Timeout during capturing finger
ACK_WRONG_FORMAT
0x09
Template wrong format
ACK_BREAK
0x18
Abort current command
ACK_INVALID_PARAMETER
0xB0
Input invalid parameter
ACK_FINGER_IS_NOT_PRESSED
0xB1
Finger is not pressed
ACK_COMMAND_NO_SUPPORT
0xB4
Command not support
ACK_ENROLL_OVEREXPOSURE
0xB5
Finger image is overexposure
ACK_ENROLL_MOVE_MORE
0xB6
Finger moved too less.
ACK_ENROLL_MOVE_LESS
0xB7
Finger moved too much.
ACK_ENROLL_DUPLICATE
0xB8
Finger position is duplicated.
ACK_FINGER_PRESS_NOT_FULL
0xB9
Finger press is not full.
ACK_ENROLL_POOR_QUALITY
0xBA
Finger image quality is poor.
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4. ACK Code
In a response package, the Q3 will return the execution result, and it may be of the following:
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0xA0
0 0 Flag
0
CHK
0xF5
ACK
0xF5
0xA0
Hi(Len)
Low(Len)
0 0 CHK
0xF5
Byte
1
2…Len+1
Len+2
Len+3
DATA
0xF5
Data
CHK
0xF5
Offset
Description
0
Device ID : 0x01
1
Reserved : default 0x00.
2
FW release date
[0] : Day, [1] : Month
[2] : Year (Low byte), [3] : Year (High byte)
6
Reserved : default 0x00.
10
Sensor type
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5. Command Details
5.1 Open
Check the device connection status and initalize sensor status.
Flag:
1: Read FW date and module.
Hi(Len):
FW module and date length high byte.
Low(Len):
FW module and date length low byte.
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Data structure (11 Bytes):
If the Flag is set to 0, the data package will not return.
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0xA1
0 0 0 0 CHK
0xF5
ACK
0xF5
0xA1
0 0 ACK
0
CHK
0xF5
Byte
1 2 3 4 5 6 7 8 CMD
0xF5
0xA3
Index
0 0 0
CHK
0xF5
ACK
0xF5
0xA3
0 0 ACK
0
CHK
0xF5
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5.2 Close
Close command does nothing. (Reserved)
ACK:
ACK_SUCCESS
5.3 UART Control
UART baud rate setting.
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Baudrate Index:
1: 9600
2:19200
3:115200
4:230400
5:460800
6:921600
ACK:
ACK_SUCCESS
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Byte
1 2 3 4 5 6 7 8 CMD
0xF5
0xB4
switch
0 0 0
CHK
0xF5
ACK
0xF5
0xB4
0 0 ACK
0
CHK
0xF5
Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0xB5
0 0 0 0 CHK
0xF5
ACK
0xF5
0xB5
Status
0
ACK
0
CHK
0xF5
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5.4 LED Control
Control LED on/off.
Switch:
0: On
1: Off
ACK:
ACK_SUCCESS
5.5 Check finger pressing status(IsPressFinger)
This command is used to check finger. This function can be replaced by reading touch signal.
Status:
0: Is Not Pressed
1: Is Pressed
ACK:
ACK_SUCCESS
ACK_FINGER_IS_NOT_PRESSED
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x01
USER
ID_H
USER
ID_L
0
Reserved
0x00
CHK
0xF5
ACK
0xF5
0x01
USER
ID_H
USER
ID_L
ACK
0
CHK
0xF5
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5.6 Enroll
Before enrollment, you can call “Get Entry ID 0x0D” to get an unregistered ID (1~N) and set it to
the USER_ID (2nd~3rd bytes). Start a registration, and you shall repeatedly call the Enroll
command till the enroll result (2nd byte) of the response packet has become from 0x01 to 0x03.
You shall use the Enroll command (8+1) times this way. The first enroll command is setting the
user ID.
If there is no finger pressed on the sensor for each sampling time in 8 seconds, the enrollment will
be canceled. The enrollment flow can be interrupted by each command except Enroll and
IsPressFinger.
USER ID_H :
USER ID high byte.
USER ID_L :
USER ID low byte
Note: User ID value is 1~N
Reserved:
Value Must be 0.
ACK :
ACK_SUCCESS
ACK_FAIL
ACK_USER_EXIST
ACK_INVALID_PARAMETER
ACK_ ENROLL_OVEREXPOSURE
ACK_ENROLL_MOVE_MORE
ACK_ENROLL_MOVE_LESS
ACK_ENROLL_DUPLICATE
ACK_FINGER_PRESS_NOT_FULL
ACK_ENROLL_POOR_QUALITY
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x01
0 0 0 0 CHK
0xF5
ACK
0xF5
ENROLL
RESULT
ENROLL
PROGRESS
0
ACK
0
CHK
0xF5
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.
ENROLL RESULT:
0x01: Continue
0x03: Final enroll
ENROLL PROGRESS:
Percentage, 1 - 8.
ACK :
ACK_SUCCESS
ACK_FAIL
You shall keep sending the Enroll command until ENROLL RESULT is 0x03. The enrollment is
completed while 0x03 is received. The following takes three sampling times, for example:
Example: ID=1
The 1st command: F5 01 00 01 00 00 xx F5 (set ID)
Return : F5 01 00 00 00 00 xx F5
The 2nd command: F5 01 00 00 00 00 xx F5 (press finger)
Return : F5 01 01 00 00 00 xx F5
The 3rd command: F5 01 00 00 00 00 xx F5 (press finger)
Return : F5 01 02 00 00 00 xx F5
……..
The last command: F5 01 00 00 00 00 xx F5 (enroll success)
Return : F5 03 08 00 00 00 xx F5
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x04
USER
ID_H
USER
ID_L
0 0 CHK
0xF5
ACK
0xF5
0x04
0 0 ACK
0
CHK
0xF5
Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x05
0 0 0 0 CHK
0xF5
ACK
0xF5
0x05
0 0 ACK
0
CHK
0xF5
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5.7 Delete one fingerprint(DeleteID)
USER ID_H :
USER ID high byte.
USER ID_L :
USER ID low byte
Note: User ID value is 1~N
ACK :
ACK_SUCCESS
ACK_NOUSER
ACK_INVALID_PARAMETER
Example: Delete ID=1
Command: F5 04 00 01 00 05 F5
Return : F5 04 00 00 00 04 F5
5.8 Delete all fingerprints(DeleteAll)
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ACK :
ACK_SUCCESS
Example: Delete all ID
Command: F5 05 00 00 00 05 F5
Return : F5 05 00 00 00 05 F5
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x09
0 0 0 0 CHK
0xF5
ACK
0xF5
0x09
USERCOUNT
_H
USERCOUNT
_L
ACK
0
CHK
0xF5
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5.9 Get enrolled fingerprint count(GetEnrollCount)
ACK :
ACK_SUCCESS
ACK_NOUSER
Example: Get user count
Command: F5 09 00 00 00 00 09 F5
Return: F5 09 00 02 00 00 0B F5 (Two ID exists)
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x0C
0 0 0 0 CHK
0xF5
ACK
0xF5
0x0C
USER
ID_H
USER
ID_L
0 0 CHK
0xF5
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5.10 1:N Identification(Identify)
This function supports breaks when capturing a finger. This command will recognize and respond
to the user ID. If the user can not be found, the ID shall return 0, and the 5th return ACK.
Otherwise
USER ID_H :
USER ID high byte.
USER ID_L :
USER ID low byte
ACK :
ACK_SUCCESS
ACK_NOUSER
ACK_FAIL
Example:
Command: F5 0C 00 00 00 00 0C F5
Identify success: ID=2
Return: F5 0C 00 02 00 00 CHK F5
Identify Not Found: ID=0
Return: F5 0C 00 00 00 00 0C F5
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Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x0D
0 0 0 0 CHK
0xF5
ACK
0xF5
0x0D
USER
ID_H
USER
ID_L
ACK
0
CHK
0xF5
Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x26
0 0 0 0 CHK
0xF5
ACK
0xF5
0x26
Hi(Len)
Low(Len)
ACK
0
CHK
0xF5
Byte
1
2…Len+1
Len+2
Len+3
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5.11 Get entry ID(GetEntryID)
Return an unused ID (1~N).
USER ID_H :
USER ID high byte.
USER ID_L :
USER ID low byte
Note: Unused ID value is 1~N
ACK :
ACK_SUCCESS
ACK_FULL
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5.12 Get firmware version
Get firmware information
Hi(Len):
Firmware version length high byte
Low(Len):
Firmware version length low byte
ACK:
ACK_SUCCESS
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DATA
0xF5
Version Data
CHK
0xF5
Offset
Description
0
Sensor type
12
Year
13
Month
14
Day
15
Version
18
TBD
39
TBD
Byte
1 2 3 4 5 6 7
8
CMD
0xF5
0x92
USER
ID_H
USER
ID_L
0 0 CHK
0xF5
ACK
0xF5
0x92
USER
ID_H
USER
ID_L
ACK
0
CHK
0xF5
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The version data include sensor type, enroll type, and module version.
Version data structure (40 Bytes) :
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5.13 Enroll Cancel
Interrupt the enrollment sequence and erase the template data of ID.
USER ID_H :
USER ID high byte.
USER ID_L :
USER ID low byte
Note: User ID value is 1~N
Reserved:
Value Must be 0.
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ACK :
ACK_SUCCESS
ACK_FAIL
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6. Protocol: Flowchart
Example: Enrollment
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The host can use “Is Press Finger (0xB5)” command or check “Touch I/O pin (TP_HI)” to detect
finger is pressed or not.
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Example: Identification
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The host can use “Is Press Finger (0xB5)” command or check “Touch I/O pin (TP_HI)” to detect
finger is pressed or not.
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