CN201048373Y

CN201048373Y - Wireless serial port equipment

Info

Publication number: CN201048373Y
Application number: CNU2006201205917U
Authority: CN
Inventors: 姜贞勇; 周科
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-23
Filing date: 2006-06-23
Publication date: 2008-04-16
Anticipated expiration: 2016-06-23

Abstract

The utility model relates to a serial module which uses a frequency of 433MHz to process the wireless data transmission, and a microprocessor with low cost at present is integrated by using a mature single chip wireless radio frequency chip. In order to overcome the defects of co-frequency interference and transmitted data code disorder of the prior wireless transmitting device, the utility model not only can resolve the problem of co-frequency interference and conflict, but also the transmitted data is processed encoding and error correcting treatment to improve the quality of data transmitting through software technology. The bit error rate reaches 10<-4>. Especially the power consumption is reduced to one tenth of a common device through improvement of the hardware and optimization of the software. The energy saving problem when battery power supply equipment is used is solved. The utility model has the innovating points that the anticollision mechanism is actively sent to resolve the problem of the co-frequency interference between equipment. The transmitting quality of data is improved by the adopted error correcting treatment. The utility model can automatically save energy to reduce power consumption, and the applicable layer is broadened.

Description

A kind of wireless serial equipment

Technical field

A kind of wireless serial equipment is a kind of Radio Data-transmission device, is high-performance, the intelligent instrumentation of optical, mechanical and electronic integration industry.

Background technology

Need band occupancy during wireless data transmission device work, just can carry out transfer of data work after having only transceiver to select identical frequency simultaneously, and the transmission of radio wave does not have the direction restriction, but, if it is neighbouring or occur the identical wireless device work of frequency on every side, this moment, radio transmission apparatus will be subjected to co-channel interference, caused the data mess code that is transmitted.The utility model adopts the 433MHz frequency of ISM band, utilizes the radio frequency detection techniques to reach anticollision and handles, and realizes the closely wireless transmission of data.

Summary of the invention

The purpose of this utility model provides a kind of wireless serial equipment, promptly utilizes ripe monolithic radio frequency chip, and integrated current microprocessor cheaply carries out the data wireless transmission with the 433MHz frequency.Current serial equipment adopts the wired mode of RS232 usually, and distance has certain restriction, generally in 25 meters.The utility model is a kind of wireless serial, and the equipment room of two needs transmission data does not need line, and distance can be above 500 meters at horizon range.

The technical scheme that the utility model adopted is:

1, initiatively sends data.It is that data initiatively send that the wireless data serial ports sends the most difficult, when having a plurality of serial ports to send data simultaneously with frequency range, will inevitably occur disturbing and influences the reception of data.The utility model adopts the radio frequency detection techniques, and whether in the air have data send, have then and wait for if differentiating before data are about to send, and do not have then to send, thereby realizing that a plurality of wireless devices initiatively send does not collide, and satisfies the great demand of existing market.

2, REID.Utilize radiofrequency signal and space coupled transfer characteristic, realize the information of data acquisition target is initiatively read.

3, code correction technology.The utility model adopts multiple coding techniques, makes equipment have certain error correcting capability and antijamming capability, greatly avoids the generation of error code in the code stream transmission.Wherein adopt BCH code and Hamming code to realize forward error correction, include the process of error detection, location, error correction.The BCH code checking algorithm can be tested and error correction to multidigit random error and multidigit burst error, and Hamming code can realize that per four are entangled a dislocation sign indicating number.

4, Frame recognition technology.User's data is encoded, to adding a pilot header before each user's data frame, pilot header adopts the character of 48 positions, and the while is followed by the character of two hexadecimal bytes, add through the user data behind the coding, add the character of 32 positions at last.Owing to guarantee through hexadecimal identical characters not occurring in the user data behind the coding, can guarantee to realize that user's data frame and our Frame are impossible repeat; Because the data of user data frame through coding, can not repeat with the frame head and the postamble data of our Frame, simultaneously so the length of user data area also reaches unrestricted requirement;

Compared with the prior art, the utlity model has following advantage:

1, data initiatively send anti-the collision; Also can poll;

2, possess dormancy and start function;

3, baud rate can be selected for 4 kinds, can customize baud rate again according to user's needs;

4, interface shape is various, but 232,485 wire jumpers are selected;

5, long transmission distance can reach 800 meters;

6, near the 433MHz frequency, there are 8 frequency ranges to select, make things convenient for networking

Description of drawings

Fig. 1 is a principle assumption diagram of the present utility model.

Specific implementation method

Line relation of the present utility model is with reference to Fig. 1.This equipment is the wireless serial communication equipment.The utility model wireless serial is passed through to link to each other with the IO interface of ATMEGA8CPU (1) based on interface PSEL, PLCK, PDI, PDO, DCLK, DIO, the LOCK of the narrowband wireless communication chip CC1020 (2) of ISM band 433MHz, communication interface circuit (3) is linked to each other with RXD, the TXD of ATMEGA8CPU (1), realize that the serial line interface data to aerial transmission, reach the purpose of serial data wireless receiving and dispatching; External 10 dial-ups (4) link to each other with the IO mouth of ATMEGA8CPU (1), realize near chip CC1020 8 channels 433MHz switching, realize serial ports baud rate 1200/2400/4800/9600 selection, realize serial data whether parity check or the selection of no parity check and the functions such as switching that realize RS232/RS422; And CC1020 (2) is connected by PA EN with power amplification interface (5) and the connection of radio-frequency antenna RF-OUT output, adds that antenna transmission receives switching (7), realizes the transmitting-receiving of wireless data by radio-frequency antenna interface (6).Wherein power amplification is just worked in data transmission procedure, and the radio frequency reception does not have the power amplification function.

One of key technology of the present utility model is to have utilized the arrowband wireless interface chip CC1020 of the 433MHz of international ISM band to realize that the active of wireless data sends, guaranteed that anti-the collision received and dispatched in the data transmission procedure, this has extremely important realistic meaning in industrial application.

Claims

1. wireless serial equipment, it is characterized in that: this equipment links to each other with the IO interface of ATMEGA8CPU (1) by wireless communication chips CC1020 (2), communication interface circuit (3) is linked to each other with RXD, the TXD of ATMEGA8CPU (1), external 10 dial-ups (4) link to each other with the IO mouth of ATMEGA8CPU (1), CC1020 (2) receives switching (7) with power amplification interface (5) and transmission and is connected, power amplification interface (5) receives switching (7) with antenna transmission and is connected, and radio-frequency antenna interface (6) receives switching (7) with transmission and is connected.

2. wireless serial according to claim 1, it is characterized in that: interface PSEL, PLCK, PDI, PDO, DCLK, DIO, the LOCK of described narrowband wireless communication chip CC1020 (2) based on ISM band 433MHz link to each other with the IO interface of ATMEGA8CPU (1), and communication interface circuit (3) is linked to each other with RXD, the TXD of ATMEGA8CPU (1).

3. wireless serial according to claim 1 is characterized in that: described external 10 dial-ups (4) link to each other with the IO mouth of ATMEGA8CPU (1).

4. wireless serial according to claim 1 is characterized in that: CC1020 (2) is connected by PA EN with power amplification interface (5) and is connected with radio-frequency antenna RF-OUT output; Power amplification interface (5) receives switching (7) with antenna transmission and is connected by RF-OUT; , CC1020 (2) is connected by RF-IN with radio-frequency antenna interface (6).