CN204993440U

CN204993440U - Can protocol conversion device

Info

Publication number: CN204993440U
Application number: CN201520843800.XU
Authority: CN
Inventors: 杜建清
Original assignee: Lishui Vocational Technical College
Current assignee: Lishui Vocational Technical College
Priority date: 2015-10-28
Filing date: 2015-10-28
Publication date: 2016-01-20
Anticipated expiration: 2025-10-28

Abstract

The utility model provides a CAN protocol conversion device, includes the RS232 data transmission module, and the RS232 data transmission module is connected with STC12C5608AD singlechip host system, and STC12C5608AD singlechip host system connects CAN physics converting circuit, and CAN physics converting circuit connects the CAN communication control module. The utility model discloses advantages such as the singlechip has small, low power dissipation, control function is strong, the extension is nimble, miniaturation and convenient to use, the wide application combines different kinds of data signal standards to carry out data communication's interconversion in various data signal conversion equipment. Adopt single chip microcomputer control to make that the communication mechanism transformation is digital more, intelligent, the miniaturation, and the function is more powerful compared with adopting electron or digital circuit.

Description

CAN protocol conversion equipment

Technical field

The utility model relates to a kind of CAN protocol conversion equipment.

Background technology

At present, single-chip microcomputer is a kind of integrated circuit (IC) chip, adopt very large scale integration technology, having the perfect computer system of that the central processor CPU of data-handling capacity, random access memory ram, read only memory ROM, multiple I/O mouth and the function i ntegration to one piece of silicon chip such as interrupt system, timer/timer are formed.

Single-chip microcomputer has the advantages such as volume is little, low in energy consumption, controlling functions strong, expansion is flexible, microminiaturized and easy to use, be widely used in various data-signal conversion equipment, in conjunction with dissimilar data-signal standard, the mutual conversion of the data communications such as such as RS232, RS485, RS422, CAN can be realized.RS232 is widely used as the computer serial interface of standard, meanwhile, along with the develop rapidly of field bus technique, have that real-time is good, reliability is high, the CAN of advantages of simple structure and simple is also used more and more in TT&C system, but because both bus structures, communication protocol and transmission feature are different, bring inconvenience thus to the connection between distinct device.

Utility model content

The utility model will solve above-mentioned prior art Problems existing, a kind of CAN protocol conversion equipment is provided, with a kind of CAN protocol conversion equipment that STC12C5608AD single-chip microcomputer is core, this communication switching unit can realize the mutual conversion between RS232 rs 232 serial interface signal and CAN communication signal, and supports standard frame and expansion frame two kinds of patterns of CAN2.0 agreement.

The utility model solves the technical scheme that its technical problem adopts: this CAN protocol conversion equipment, comprise RS232 data transmission module, RS232 data transmission module is connected with STC12C5608AD single-chip microcomputer main control module, STC12C5608AD single-chip microcomputer main control module connects CAN physical transformation circuit, and CAN physical transformation circuit connects CAN communication control module.This device is divided into two parts: Part I converts the RS232 communications regime signal that external world's transmission is come in CAN communication standard signal, and Part II converts the CAN communication standard signal that external world's transmission is come in RS232 communications regime signal.System can realize the mutual conversion between RS232, CAN communication standard, and can realize the selection of CAN communication pattern, and 65536 addresses are called out and support large batch of transfer of data.

In order to perfect further, CAN communication control module is primarily of interface management logic device, information buffer, acceptance fitration, bit stream processor, bit timing logic, mismanage logic device composition, information buffer comprises transmission buffer and reception buffer, described interface management logic device is link information buffer, bit stream processor and bit timing logic respectively, transmission buffer connection bit stream handle in information buffer, bit stream processor connects acceptance fitration, and acceptance fitration connects reception buffer and mismanage logic device respectively.

Interface management logic device is mainly used in explaining from the order of CPU, the addressing of control CAN register and provide interrupting information and corresponding state to controller.Transmission buffer is the interface between CPU and bit stream processor, and it can store the complete information be sent in CAN network.Reception buffer is annoying interface between acceptance fitration and CPU, for storing the information received from CAN.Acceptance fitration is the information of identification code received for comparison, to determine the information whether receiving this.Bit stream processor is the timer of a control data stream between transmission buffer and CAN, simultaneously its also error detection and error handle in CAN.Bit timing logic device is for monitoring the bit timing that the CAN of serial ports is relevant with bus with process.The error message of mismanage logic device primary responsibility transport layer module and the error report of received bit stream handle, notify that bit stream processor and interface management logic device carry out error statistics simultaneously.

Perfect further, be provided with restorer in CAN communication control module.

Perfect further, be provided with oscillator in CAN communication control module.

The effect that the utility model is useful is: the utility model single-chip microcomputer has the advantages such as volume is little, low in energy consumption, controlling functions strong, expansion is flexible, microminiaturized and easy to use, be widely used in, in various data-signal conversion equipment, carrying out the mutual conversion of data communication in conjunction with dissimilar data-signal standard.Adopt Single-chip Controlling make communication mechanism change digitlization more, intellectuality, microminiaturization, and function compared with employing electronics or digital circuit more powerful.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present utility model;

Fig. 2 is the structural representation of CAN communication control module in the utility model;

Fig. 3 is the structural representation of RS232 data transmission module in the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

With reference to accompanying drawing: CAN protocol conversion equipment in the present embodiment, comprise RS232 data transmission module, RS232 data transmission module is connected with STC12C5608AD single-chip microcomputer main control module, STC12C5608AD single-chip microcomputer main control module connects CAN physical transformation circuit, and CAN physical transformation circuit connects CAN communication control module.This device is divided into two large divisions, and Part I is that RS232 signal is converted to CAN communication signal, and Part II is that CAN communication signal is converted to RS232.RS232 signal is converted to CAN communication signal section: single-chip microcomputer first receives RS232 data, and judges pattern and the address of changing CAN signal, then by the conversion of CAN chip, converts corresponding CAN communication signal to.CAN communication signal is converted to RS232:CAN data first by CAN physical transformation circuit, is then sent to single-chip microcomputer, and single-chip microcomputer reads corresponding data bit and carries out data time-out and judges, finally converts CAN communication signal to RS232 communication signal.System can be divided into RS232 data transmission module, STC12C5608AD single-chip microcomputer main control module, CAN physical transformation circuit, CAN communication control module, and physical relationship as shown in Figure 1.

RS232 data transmission module mainly contain two large divisions's function, Part I carries out data communication with extraneous serial port terminal, and the data received are sent on single-chip microcomputer, Part II is that the serial data sent by single-chip microcomputer is sent to extraneous serial port terminal.To realize 0.1M---the serial data transmission of any distance between 10M.

MAX232A chip is powered by direct current 5V, has two passage serial ports and exports, can change two-way RS232 communication signal simultaneously.In the design, we only adopt first via ALT-CH alternate channel.R1OUT port in MAX232A is connected with the RXD port in STC12C5608AD, and the R1IN port in MAX232A is connected with the TXD port in STC12C5608AD, namely constitutes the serial data link of MAX232 and STC12C5608AD.And only to connect these two ports be to realize serial communication function completely, also must add the minimum system of MAX232A, RS232 data transmission module is just calculated and is really realized its serial data transfer function.The minimum system of MAX232A connects as shown in Figure 3.

Wherein CAN communication control module is primarily of interface management logic device, information buffer, acceptance fitration, bit stream processor, bit timing logic, mismanage logic device composition, information buffer comprises transmission buffer and reception buffer, described interface management logic device is link information buffer, bit stream processor and bit timing logic respectively, transmission buffer connection bit stream handle in information buffer, bit stream processor connects acceptance fitration, and acceptance fitration connects reception buffer and mismanage logic device respectively.Restorer and oscillator is provided with in CAN communication control module.Reset is the initialization operation of single-chip microcomputer, only need add that the high level being greater than 2 machine cycles just can make monolithic processor resetting to the reset pin RST of single-chip microcomputer.As shown in Figure 2.

Although the utility model has illustrated by reference to preferred embodiment and has described, those skilled in the art should understand, and in the scope of claims, can do the various change in form and details.

Claims

1. a CAN protocol conversion equipment, comprise RS232 data transmission module, it is characterized in that: described RS232 data transmission module is connected with STC12C5608AD single-chip microcomputer main control module, STC12C5608AD single-chip microcomputer main control module connects CAN physical transformation circuit, and CAN physical transformation circuit connects CAN communication control module.

2. CAN protocol conversion equipment according to claim 1, it is characterized in that: described CAN communication control module is primarily of interface management logic device, information buffer, acceptance fitration, bit stream processor, bit timing logic, mismanage logic device forms, information buffer comprises transmission buffer and reception buffer, described interface management logic device is link information buffer respectively, bit stream processor and bit timing logic, transmission buffer connection bit stream handle in information buffer, bit stream processor connects acceptance fitration, acceptance fitration connects reception buffer and mismanage logic device respectively.

3. CAN protocol conversion equipment according to claim 2, is characterized in that: be provided with restorer in described CAN communication control module.

4. CAN protocol conversion equipment according to claim 1, is characterized in that: be provided with oscillator in described CAN communication control module.