ZFM-70 SeriesFingerprint Identification Module
User Manual
www.zhiantec.com
Hangzhou Zhian Technologies Co.,Ltd
8
Return Parameter: Confirmation code (1 byte)
Command (or instruction) package format:
Note: Confirmation code=00H: finger collection success;
Confirmation code=01H: error when receiving package;
Confirmation code=02H: can’t detect finger;
Confirmation code=03H: fail to collect finger;
”
、
“
Close Led
”
and
“
GetImageFree
”
)
ZFM-70 series also retain the old command interface , use the old command, you can shark the light when
capturing fingerprint
(
Realize by use the command
“
GetImg
”
)
。
The faster response
By optimizing the image acquisition and pretreatment of the driver, the image acquisition and image
preprocessing process can save more time, better image quality, faster response speed.
Power on handshake
When ZFM-70 series power on, it will send a byte(0x55) to handshake, then upper computer can send other
commands.
single command to complete the enroll and search
ZFM-70 series add the commands
“
Autologin
”
and
“
AutoSearch
”
, in single command to complete the enroll
and search
1.3 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 specifc template designated in the
Module; for 1:N matching, or searching, system will search the whole finger library for the matching finger. In