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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.

Random number generator

Module integrates a hardware 32-bit random number generator (RNG) (without seed). Via

instruction GetRandomCode, system will generate a random number and upload it.

IV Communication Protocol

The protocol defines the data exchanging format when R30X series communicates with upper

computer. The protocol and instruction sets apples for both UART and USB communication mode.

For PC, USB interface is strongly recommended to improve the exchanging speed, especially in

fingerprint scanning device.

5.1 Data package format

When communicating, the transferring and receiving of command/data/result are all wrapped in

data package format.

Data package format

Header

Adder

Package

identifier

Package

length

Package content

(instuction/data/Parameter）

Checksum

Definition of Data package

Name

Symbol

Length

Description

Header

Start

2 bytes Fixed value of 0xEF01; High byte transferred first.

Adder

ADDER

4 bytes

Default value is 0xFFFFFFFF, which can be modified by

command. High byte transferred first and at wrong adder value,

module will reject to transfer.

Package

identifier

PID

1 byte

01H

Command packet;

02H

Data packet; Data packet shall not appear alone in

executing processs, must follow command packet or

acknowledge packet.

07H

Acknowledge packet;