Velleman VMA329, Руководство пользователя

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ZFM-70 SeriesFingerprint Identification Module User Manual
www.zhiantec.com Hangzhou Zhian Technologies Co.,Ltd
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lowest; however at level 5, FAR is the lowest and FRR is the highest.
4.3.3 Data package length (Parameter Number: 6)
The parameter decides the max length of the transferring data package when communicating with upper
computer. Its value is 0, 1, 2, 3, corresponding to 32 bytes, 64 bytes, 128 bytes, 256 bytes respectively.
4.4 System status register
System status register indicates the current operation status of the Module. Its length is 1 word, and can be
read via instruction ReadSysPara. Definition of the register is as follows:
Bit Num 15 4 3 2 1 0
Description Reserved ImgBufStat PWD Pass Busy
Note:

Busy
：
1 bit. 1: system is executing commands; 0: system is free;

Pass
：
1 bit. 1: find the matching finger; 0: wrong finger;

PWD
：
1 bit. 1: Verified device’s handshaking password.

ImgBufStat
：
1 bit. 1: image buffer contains valid image.
4.5 Module password
At power-on reset, system first checks whether the handshaking password has been modified. If not, system
deems upper computer has no requirement of verifying password and will enter into normal operation mode.
That’s, when Module password remains the default, verifying process can be jumped. The password length is 4
bytes, and its default factory value is 00H, 00H, 00H, 00H.
Should the password have be modified, refer to instruction SetPwd , then Module (or device) handshaking
password must be verified before the system enter into normal operation mode. Or else, system will refuse to
execute and command.
The new modified password is stored in Flash and remains at power off.
4.6 Module address
Each module has an identifying address. When communicating with upper computer, each instruction/data is
transferred in data package form, which contains the address item. Module system only responds to data package
whose address item value is the same with its identifying address.
The address length is 4 bytes, and its default factory value is 0xFFFFFFFF. User may modify the address via
instruction SetAdder. The new modified address remains at power off.
4.7 Notepad
Module has an area of 512 bytes for notepad in Flash, The notepad is designed for 16 pages, and the size of
page is 32 bytes. Via instruction WriteNotepad and ReadNotepad can write and read the notepad.
Note: When write one page, all 32 bytes will be written, and the old data will be overwrite .
。