04-07-2012, 03:43 PM
Fingerprint Identification Module User Manual
[attachment=26712]
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.
Hardware connection
Via serial interface, the Module may communicate with MCU of 3.3V or 5V power: TD (pin 2 of
P1) connects with RXD (receiving pin of MCU), RD (pin 3 of P1) connects with TXD (transferring
pin of MCU). Should the upper computer (PC) be in RS-232 mode, please add level converting
circuit, like MAX232, between the Module and PC.
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.
Buffer
There are an image buffer and two 512-byte-character-file buffer within the RAM space of the
module. Users can read & write any of the buffers by instructions.
Note: Contents of the above buffers will be lost at power-off.
Image buffer
ImageBuffer serves for image storage and the image format is 256*288 pixels.
When transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred
(that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the
transferring. When uploaded to PC, the 16-grey-degree image will be extended to 256-grey-degree
format. That’s 8-bit BMP format.
When transferring through USB, the image is 8-bit pixel, that’s 256 grey degrees.
System Confiuration Parameter
To facilitate user’s developing, Module opens part system parameters for use. And the basic
instructions are SetSysPara & ReadSysPara. Both instructions take Parameter Number as
parameter.
When upper computer sends command to modify parameter, Module first responses with original
configurations, then performs the parameter modification and writes configuration record into Flash.
At the next startup, system will run with the new configurations.
[attachment=26712]
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.
Hardware connection
Via serial interface, the Module may communicate with MCU of 3.3V or 5V power: TD (pin 2 of
P1) connects with RXD (receiving pin of MCU), RD (pin 3 of P1) connects with TXD (transferring
pin of MCU). Should the upper computer (PC) be in RS-232 mode, please add level converting
circuit, like MAX232, between the Module and PC.
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.
Buffer
There are an image buffer and two 512-byte-character-file buffer within the RAM space of the
module. Users can read & write any of the buffers by instructions.
Note: Contents of the above buffers will be lost at power-off.
Image buffer
ImageBuffer serves for image storage and the image format is 256*288 pixels.
When transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred
(that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the
transferring. When uploaded to PC, the 16-grey-degree image will be extended to 256-grey-degree
format. That’s 8-bit BMP format.
When transferring through USB, the image is 8-bit pixel, that’s 256 grey degrees.
System Confiuration Parameter
To facilitate user’s developing, Module opens part system parameters for use. And the basic
instructions are SetSysPara & ReadSysPara. Both instructions take Parameter Number as
parameter.
When upper computer sends command to modify parameter, Module first responses with original
configurations, then performs the parameter modification and writes configuration record into Flash.
At the next startup, system will run with the new configurations.