Grow R503 User manual

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R503 Fingerprint Module
User Manual
Hangzhou Grow Technology Co., Ltd.
2022.10 Ver: 1.2.2

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Preface & Declaration
Thank you for you selection of R503 Fingerprint Identification Module of GROW.
The Manual is targeted for hardware & software development engineer, covering
module function, hardware and software interface etc. To ensure the developing process
goes smoothly, it is highly recommended the Manual is read through carefully.
Because of the products constantly upgraded and improved, module and the manual
content may be changed without prior notice. If you want to get the latest information,
please visit our company website (www.hzgrow.com).
We have been trying our best to ensure you the correctness of the Manual. However, if
you have any question or find error, feel free to contact us or the authorized agent. We
would be very grateful.
The Manual contains proprietary information of Hangzhou Grow Technology Co., Ltd.,
which shall not be used by or disclosed to third parties without the permission of GROW,
nor for any reproduction and alteration of information without any associated warranties,
conditions, limitations, or notices.
No responsibility or liability is assumed by GROW for the application or use, nor for
any infringements of patents or other intellectual property rights of third parties that may
result from its use.
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Revised Version
Version
Number
Date
Revise Content
Modifier
V1.2
2021.10
1. LED colors increased from three to seven,
and the instruction formats were downward
compatible.
2. Added 0x31 automatic registration template:
the upper computer can automatically collect 6
images by sending only one command, and then
generate templates for saving.
3. Added 0x32 automatic fingerprint
verification: the upper computer can only send
one command to realize image collection,
generate features, search and compare the
fingerprint database, and return the comparison
results
4. Added template upload procedure flow
5. Added template download process
Grow Tech
V1.2.1
2022.03
1. Added Power Supply Requirements,Ripple
noise
2. Update Command: The note of UpChar and
DownChar
Grow Tech
V1.2.2
2022.10
1. Added Buffer contents
Grow Tech

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Catalog
I Introduction ................................................................................................................................... - 1 -
Operation Principle .....................................................................................................................- 1 -
II Hardware Interface .......................................................................................................................- 2 -
Exterior Interface ........................................................................................................................ - 2 -
Serial Communication ................................................................................................................ - 2 -
Hardware Connection ................................................................................................................. - 3 -
Serial communication protocol ...................................................................................................- 3 -
Power-on delay time ................................................................................................................... - 3 -
Power Supply Requirements ...................................................................................................... - 3 -
Ripple noise ................................................................................................................................ - 4 -
III System Resources ....................................................................................................................... - 5 -
Notepad .......................................................................................................................................- 5 -
Buffer .......................................................................................................................................... - 5 -
Fingerprint Library ..................................................................................................................... - 5 -
System Configuration Parameters .............................................................................................. - 5 -
Baud rate control (Parameter Number: 4) .......................................................................... - 6 -
Security Level (Parameter Number: 5) .............................................................................. - 6 -
Data package length (Parameter Number: 6) ..................................................................... - 6 -
System status register ................................................................................................................. - 6 -
Module password ........................................................................................................................- 6 -
Module address ........................................................................................................................... - 6 -
Random number generator ......................................................................................................... - 7 -
Features and templates ................................................................................................................- 7 -
IV Communication Protocol ............................................................................................................- 8 -
Data package format ................................................................................................................... - 8 -
Instruction Table ......................................................................................................................... - 9 -
Check and acknowledgement of data package ...........................................................................- 9 -
V Module Instruction System ........................................................................................................ - 11 -
System-related instructions .......................................................................................................- 11 -
Verify password VfyPwd ...............................................................................................- 11 -
Set password SetPwd ...................................................................................................- 11 -
Set Module address SetAdder .............................................................. - 12 -
Set module system’s basic parameter SetSysPara .......................................................- 12 -
Read system Parameter ReadSysPara .......................................................- 13 -
Read valid template number TempleteNum ..............................................................- 13 -
Read fingerprint template index table ReadIndexTable（0x1F）......................... - 14 -
Fingerprint-processing instructions ..........................................................................................- 15 -
To collect finger image GetImg .................................................................................- 15 -
Upload image UpImage ...........................................................................................- 15 -
Download the image DownImage ...........................................................................- 16 -
To generate character file from image GenChar ....................................................... - 17 -
To generate template RegModel ............................................................................- 17 -
To upload template UpChar .......................................................................................- 18 -
Download template DownChar ................................................................................... - 19 -

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To store template Store ............................................................................................- 19 -
To read template from Flash library LoadChar .......................................................- 20 -
To delete template DeletChar .............................................................................. - 21 -
To empty finger library Empty ..............................................................................- 21 -
To carry out precise matching of two finger templates Match ............................. - 22 -
To search finger library Search ........................................................................... - 22 -
Fingerprint image collection extension command GetImageEx(0x28) ....................- 23 -
Cancel instruction Cancel(0x30) ......................................................................... - 23 -
HandShake HandShake（0x40）..................................................................... - 24 -
CheckSensor CheckSensor (0x36) ..................................................................... - 24 -
Get the algorithm library version GetAlgVer (0x39) .............................................. - 25 -
Get the firmware version GetFwVer (0x3A) .............................................................- 25 -
Read product information ReadProdInfo (0x3C) ......................................................- 26 -
Soft reset SoftRst (0x3D) .................................................................................. - 26 -
Aura control AuraLedConfig (0 x35) .............................................................- 27 -
Automatic registration template AutoEnroll (0 x31) ....................................... - 28 -
Automatic fingerprint verification AutoIdentify (0 x32) ................................. - 30 -
Other instructions ......................................................................................................................- 32 -
To generate a random code GetRandomCode ....................................... - 32 -
To read information page ReadInfPage .......................................................................- 32 -
To write note pad WriteNotepad ..............................................................................- 33 -
To read note pad ReadNotepad ................................................................................- 33 -
Ⅵ Operation Process ..................................................................................................................... - 35 -
Register Fingerprint ..................................................................................................................- 35 -
Search Fingerprint .................................................................................................................... - 36 -
Automatic Register Fingerprint ................................................................................................- 37 -
Automatic Fingerprint Verification .......................................................................................... - 38 -
Upload Fingerprint Template ....................................................................................................- 39 -
The fingerprint is obtained from the sensor and the feature is generated then upload to the
main control ...................................................................................................................... - 39 -
Read a specified template upload to Flash Fingerprint Database .................................... - 40 -
Download Fingerprint Template ...............................................................................................- 41 -
The main control downloads a fingerprint feature and searches the fingerprint database
based on the feature .......................................................................................................... - 41 -
The main control downloads two fingerprint features or templates for accurate comparison- 42 -
The main control downloads one fingerprint feature or template for accurate comparison- 43 -
Low power standby ...................................................................................................................- 44 -
Ⅶ Reference Circuit .....................................................................................................................- 45 -

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I Introduction
Operation Principle
Fingerprint processing includes two parts: fingerprint enrollment and fingerprint matching (the
matching can be 1:1 or 1:N).
When enrolling, user needs to enter the finger two times. The system will process the two time
finger images, generate a template of the finger based on processing results and store the template.
When matching, user enters the finger through optical sensor and system will generate a template
of the finger and compare it with templates of the finger library. For 1:1 matching, system will
compare the live finger with specific template designated in the Module; for 1:N matching, or
searching, system will search the whole finger library for the matching finger. In both
circumstances, system will return the matching result, success or failure.
Power
DC 3.3V
Interface
UART(3.3V TTL logical
level)
Working current
(Fingerprint
acquisition)
20mA
Matching Mode
Matching Time
1:1 and 1:N
1:N<10ms/Fingerprint
Standby current
(finger detection)
Typical touch standby
voltage: 3.3V
Average current: 2uA
Characteristic value
size
512 bytes
Baud rate
(9600*N)bps,
N=1～6 (default N=6）
Template size
1536 bytes
Image acquiring time
<0.2s
Image resolution
508dpi
Sensing Array
192*192 pixel
Detection Area
Diameter 15mm
Storage capacity
200
Security level
5 (1, 2, 3, 4, 5(highest))
FAR
<0.001%
FRR
<1%
Generate feature
point time
< 500ms
Starting time
≤50ms
Working
environment
Temp: -20℃- +60℃
Storage
environment
Temp: -40℃- +75℃
RH: 10%-85%
RH: <85%

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II Hardware Interface
Exterior Interface
Connector: MX1.0--6P Thread:M25
Product external diameter: 28mm Inner diameter:25mm Height:19mm
(Standard Height is 19mm, also have 15mm and 32mm height, if needs this size,pls contact sales)
Serial Communication
Connector: MX1.0--6P
Pin
Name
Description
Pic
1
Power Supply
DC3.3V
Note:
The line order has nothing
to do with color.
2
GND
Signal ground.
Connected to power ground.
3
TXD
Data output. TTL logical level
4
RXD
Data input. TTL logical level
5
WAKEUP
Finger Detection Signal. Standby-high level,
have finger-output low level.
6
3.3VT
Touch induction power supply, DC3—5V

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Hardware Connection
The RX of the module is connected with the TX of the upper computer, and the TX of the module
is connected with the RX of the upper computer. The IRQ signal can be connected with the middle
fracture or IO port of the upper computer.
To reduce the system standby power consumption,when the upper computer needs to use the
fingerprint module,then power on the main power supply of the fingerprint module. At this time,
the fingerprint module is powered on,and complete the corresponding instructions sent by the upper
computer.When the upper computer does not need to use the fingerprint module, disconnect the
fingerprint module from the main power supply.
When the upper computer is in standby mode, in order to keep the finger touch detection, the touch
power supply needs to be powered all the time. The working voltage of the touch power supply is
3V~5V, and the average current of the touch power supply is about 2uA. When there is no finger
touch, the default touch sensing signal outputs high level; When a finger touches, the default touch
sensing signal outputs low level. After detecting the touch sensing signal, the upper computer
supplies power to the fingerprint module and the fingerprint module starts to work.
The maximum response time of the touch function is about 120mS @vt =3.3V. When the module is
not touched, the recalibration period is about 4.0sec; the touch signal output is CMOS output, and
the output voltage is roughly the same as the input voltage.
Serial communication protocol
The mode is semiduplex asychronism serial communication. And the default baud rate is 57600bps.
User may set the baud rate in 9600～115200bps。
Transferring frame format is 10 bit: the low-level starting bit, 8-bit data with the LSB first, and an
ending bit. There is no check bit.
Power-on delay time
At power on, it takes about 50ms for initialization. During this period, the Module can’t accept
commands for upper computer.After completing the initialization, the module will immediately
send a byte (0x55) to the upper computer, indicating that the module can work normally and
receive instructions from the upper computer.
Power Supply Requirements
The power supply is DC +3.3V. The power input is allowed only after the R503 is properly
connected.
Electrical components of the R503 may be damaged if you insert or remove the cable (with the
electric plug) when the cable is live. Ensure that the power supply is switched off when you insert

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or remove the cable.
The R503 may not work properly due to poor power connections, short power off/on intervals, or
excessive voltage drop pulses. So pls keep the power is stable. After the power is turned off, the
power must be turned on at least two seconds later.
Ripple noise
Since the power input of R503 is directly supplied to the image sensor and decoding chip.
To ensure stable operation, pls use low ripple noise power input.
It is recommended that the ripple noise not exceed 50mV (peak-to-peak).

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III System Resources
To address demands of different customer, Module system provides abundant resources at user’s
use.
Notepad
The system sets aside a 512-bytes memory (16 pages* 32 bytes) for user’s notepad, where data
requiring power-off protection can be stored. The host can access the page by instructions of
PS_WriteNotepad and PS_Read Notepad.
Note: when write on one page of the pad, the entire 32 bytes will be written in wholly covering the
original contents.
The user can run the module address or random number command to configure the unique
matching between the module and the system. That is, the system identifies only the unique module.
If a module of the same type is replaced, the system cannot access the system.
Buffer
The module RAM resources are as follows:
An ImageBuffer: ImageBuffer
6 feature buffers: CharBuffer[1:6]
All buffer contents are not saved without power.
The user can read and write any buffer by instruction. CharBuffer can be used to store normal
feature files or store template feature files.
When uploading or downloading images through the UART port, only the high four bits of pixel
bytes are used to speed up the transmission, that is, use gray level 16, two pixels are combined into one
byte. (The high four bits are a pixel, the low four bits are a pixel in the next adjacent column of the same
row, that is, two pixels are combined into one byte and transmitted)
Since the image has 16 gray levels, when it is uploaded to PC for display (corresponding to BMP
format), the gray level should be extended (256 gray levels, that is, 8bit bitmap format).
Fingerprint Library
System sets aside a certain space within Flash for fingerprint template storage, that’s fingerprint
library. The contents of the fingerprint database are protected by power-off, and the serial number
of the fingerprint database starts from 0.
Capacity of the library changes with the capacity of Flash, system will recognize the latter
automatically. Fingerprint template’s storage in Flash is in sequential order. Assume the fingerprint
capacity N, then the serial number of template in library is 0, 1, 2, 3 … N. User can only access
library by template number.
System Configuration Parameters
The system allows the user to individually modify a specified parameter value (by parameter serial
number) by command. Refer to SetSysPara. After the upper computer sets the system parameter
instructions, the system must be powered on again so that the module can work according to the new