CN210693978U

CN210693978U - CAN bus gateway with optical fiber interface

Info

Publication number: CN210693978U
Application number: CN201921898934.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenyang Guangcheng Technology Co ltd
Current assignee: Shenyang Guangcheng Technology Co ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-06-05
Anticipated expiration: 2029-11-06

Abstract

The utility model relates to a CAN bus gateway with optical fiber interface, this gateway include power module, optic fibre receiving and dispatching conversion module, CAN bus module, fast-speed industrial processor, keep apart protection module, time recorder, resistance mechanism's hardware conversion equipment. The utility model provides a gateway uses unique bus conversion technique, can reduce the conversion delay between light signal and the signal of telecommunication to the microsecond level, and the real-time high efficiency of communication has been guaranteed to the effectual conversion delay problem of having avoided of this technique. The utility model discloses gateway equipment introduced CAN be used for extension CAN bus communication distance, reduction or elimination bus communication interference etc.. The module is internally provided with an isolation protection device, so that the damage of equipment caused by instantaneous overvoltage and overcurrent can be effectively avoided. The module integrates a 120 ohm resistor dial switch at the CAN bus end, so that a user CAN conveniently select whether to access the resistor into the bus.

Description

CAN bus gateway with optical fiber interface

Technical Field

The utility model discloses be applied to communication field, belong to the interconversion between CAN bus and the optic fibre, be a CAN bus gateway with fiber interface.

Background

With the continuous development and progress of the communication industry, the communication feedback between people and machines becomes more convenient and efficient. The CAN bus is mainly a serial communication bus form applied to industrial control, industrial automation and automobiles. The CAN bus has a very limited transmission distance because it uses physical wires as a signal transmission medium, and the optical fiber communication uses an optical cable as a transmission medium, and the optical signal is propagated in the optical cable at a very high speed and with little loss, so that it is very suitable for long distance communication.

With the wider application of the CAN bus, users want to communicate with each other between devices in different places, and if the communication distance of the CAN bus is too long, a receiving end loses packets or even cannot receive data, which also brings great influence on the accuracy and reliability of communication. Therefore, there is a great need in the market for a device capable of extending the communication distance of the CAN bus without loss, which overcomes the problems caused by long-distance transmission.

SUMMERY OF THE UTILITY MODEL

The utility model provides a plug-and-play, easy operation's a CAN bus gateway with fiber interface through regard as CAN signal data's transmission carrier with optic fibre, CAN the original CAN bus transmission distance problem of effectual extension, increases communication distance. Optical fibers have many advantages, such as wider frequency band, lower loss, and better interference rejection.

When the gateway receives data on the CAN bus, the CAN data enters the CPU processing unit of the main control module through the CAN transceiving module and the magnetic coupling isolation for collection and analysis, then the CPU processing unit of the main control module recodes the processed data and sends the recoded data to the photoelectric conversion module, and the data is sent to the optical fiber bus through the photoelectric conversion module. When the gateway receives data on the optical fiber bus, the photoelectric conversion module converts the received optical fiber signal into an electric signal, the electric signal enters the main control module CPU processing unit for collection and decoding, and then the main control module CPU processing unit transmits the decoded data to the CAN bus through the magnetic coupling isolation and CAN transceiving module. The complete process that CAN bus data are converted into optical signals and then the optical signals are restored into the CAN bus data CAN be completed through the two conversion modules.

The utility model discloses in the CAN bus gateway that designs, its CAN bus accords with standard ISO 11898 standard, supports CAN2.0A and CAN2.0B frame format. In order to facilitate the use of a user, the user CAN quickly set the CAN bus communication baud rate through a configuration key in the gateway, and if the user does not know the current CAN bus baud rate, the user CAN also automatically identify the current CAN bus baud rate by using an automatic baud rate identification function of the gateway, so that the user CAN use the CAN bus communication baud rate more conveniently.

Description of the drawings:

fig. 1 is a block diagram of the structure of the present invention.

Fig. 2 is a flow chart of the present invention for automatically identifying the baud rate.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings and description.

A CAN bus gateway with optical fiber interface is disclosed, which converts short-distance electric signal connected by twisted pair into optical signal suitable for long-distance communication transmission through the module, the signal is transmitted in optical fiber, the smoothness of data conversion is ensured, and the limit value of transmission distance is extended to dozens of kilometers.

The gateway structure of the present invention is shown in fig. 1, the core part of which is mainly a high-speed processing unit, and the unit module adopts a 32-bit high-speed processor, and its cache area can hold a large amount of data, so that the data exchange becomes very fast and no frame loss occurs. The power supply part of the gateway is connected with a plug-in wiring terminal in a hardware mode, a user is allowed to use a power supply within the range of DC 9-30V to supply power, the power supply part mainly comprises an isolation module, a power module and a status indicator lamp, and the indicator lamp is used for judging whether the module is in a normal power supply state or not. The CAN bus data receiving and transmitting part of the gateway consists of a CAN bus receiving and transmitting module and a magnetic coupling isolator, and the magnetic coupling isolator CAN further protect a CPU processing unit of the main control module and avoid the CPU processing unit from being damaged by instantaneous large voltage and large current on the CAN bus. The optical fiber transceiver module of the gateway consists of a photoelectric conversion module and an optical fiber transceiver integrated module. The CAN bus baud rate of the gateway CAN be configured by an internal configuration key or by using an automatic baud rate identification function.

The automatic baud rate identification function can match all baud rates within the range of 5 Kbps-1 Mbps one by one, and the principle is that a piece of data is sent to a bus by using the value of each baud rate, if the data is responded by other nodes on the bus, the baud rate is set correctly, otherwise, the baud rates are not matched. The user can judge whether the identification is successful or not through the status indicator lamp on the gateway, the green lamp flickers to indicate that the baud rate is being identified, the green lamp is always on to indicate that the baud rate is successfully identified, the red lamp is always on to indicate that the baud rate is failed to be identified, and the flow chart of automatically identifying the baud rate is shown in fig. 2.

Claims

1. A CAN bus gateway with an optical fiber interface is characterized in that the module comprises a main control module, an optical fiber transceiving module, a CAN transceiving module, an isolation protection module, a status indicator lamp and a configuration key, wherein the main control module is directly connected with the status indicator lamp and the configuration key, and is respectively connected with the CAN transceiving module and the optical fiber transceiving module through different isolation protection modules.

2. The CAN bus gateway with the optical fiber interface as claimed in claim 1, wherein the isolation protection module is composed of three parts: the magnetic coupling isolation is connected with the main control module and the CAN transceiving module; the power isolation module is connected with the main control module and the power module; and the photoelectric conversion module is connected with the main control module and the optical fiber transceiving module.