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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.

Baud rate control (Parameter Number: 4)

The Parameter controls the UART communication speed of the Modul. Its value is an integer N,

N= [1, 12]. Cooresponding baud rate is 9600*N bps。

Security Level (Parameter Number: 5)

The Parameter controls the matching threshold value of fingerprint searching and matching.

Security level is divided into 5 grades, and cooresponding value is 1, 2, 3, 4, 5. At level 1, FAR is

the highest and FRR is the lowest; however at level 5, FAR is the lowest and FRR is the highest.

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.

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.

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 0FFH, 0FFH, 0FFH, 0FFH.

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.