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08H

End of Data packet.

Package

length

LENGTH

2 bytes

Refers to the length of package content (command packets and

data packets) plus the length of Checksum( 2 bytes). Unit is

byte. Max length is 256 bytes. And high byte is transferred first.

Package

contents

DATA

－

It can be commands, data, command’s parameters,

acknowledge result, etc. (fingerprint character value, template

are all deemed as data);

Checksum

SUM

2 bytes

The arithmetic sum of package identifier, package length and

all package contens. Overflowing bits are omitted. high byte is

transferred first.

Check and acknowledgement of data package

Note: Commands shall only be sent from upper computer to the Module, and the Module

acknowledges the commands.

Upon receipt of commands, Module will report the commands execution status and results to upper

computer through acknowledge packet. Acknowledge packet has parameters and may also have

following data packet. Upper computer can’t ascertain Module’s package receiving status or

command execution results unless through acknowledge packet sent from Module. Acknowledge

packet includes 1 byte confirmation code and maybe also the returned parameter.

Confirmation code’s definition is :

00h: commad execution complete;

01h: error when receiving data package;

02h: no finger on the sensor;

03h: fail to enroll the finger;

04h: fail to generate character file due to the over-disorderly fingerprint image;

05h: fail to generate character file due to the over-wet fingerprint image;

06h: ail to generate character file due to the over-disorderly fingerprint image;

07h: fail to generate character file due to lackness of character point or over-smallness of

fingerprint image

08h: finger doesn’t match;

09h: fail to find the matching finger;

0Ah: fail to combine the character files;

0Bh: addressing PageID is beyond the finger library;

0Ch: error when reading template from library or the template is invalid;

0Dh: error when uploading template;

0Eh: Module can’t receive the following data packages.

0Fh: error when uploading image;

10h: fail to delete the template;

11h: fail to clear finger library;

13h: wrong password!

15h: fail to generate the image for the lackness of valid primary image;

18h: error when writing flash;

19h: No definition error;