CN202364253U

CN202364253U - CAN repeater

Info

Publication number: CN202364253U
Application number: CN201120490148XU
Authority: CN
Inventors: 沈之柱
Original assignee: Electronic Equipment Factory Anhui University Of Science & Technology
Current assignee: Electronic Equipment Factory Anhui University Of Science & Technology
Priority date: 2011-11-30
Filing date: 2011-11-30
Publication date: 2012-08-01
Anticipated expiration: 2021-11-30

Abstract

A CAN repeater relate to a CAN bus communication device. In the CAN repeater, a first isolation CAN transceiver(U1)is connected with a first CAN controller(U3), a CTXD3 end of the first CAN controller(U3) is connected with a CRXD4 end of a second CAN controller(U4), a CRXD3 end of the first CAN controller(U3) is connected with a CTXD4 end of the second CAN controller(U4), the second CAN controller(U4) is connected with a second isolation CAN transceiver(U2), and the two isolation CAN transceivers (U1,U2) can be respectively connected with two CAN networks through a CANH1 end, a CANL1 end, a CANH2 end a CANL2 end. The CAN bus communication distance can be prolonged, and CAN bus nodes can be increased.

Description

The CAN repeater

Technical field:

The utility model relates to a kind of CAN bus communication equipment, is specifically related to a kind of CAN repeater.

Background technology:

The CAN bus is a network characteristic with many host nodes, total line use ratio is high, data transmission bauds is fast, expandability good, communication distance is long, have reliable fault processing and error-detection mechanism, individual nodes inefficacy not to influence advantages such as operation, the real-time of whole communication network is good, has obtained extensive use in various control system.But because the restriction of transceiver driving force, the direct communication distance of CAN bus is to the maximum can only hang 110 nodes at most on 10km, the bus, if need the farther or node of communication distance more for a long time, brings certain difficulty to system group network.

The utility model content:

The purpose of the utility model provides a kind of CAN repeater, and it can prolong CAN bus communication distance, increase the CAN bus node.

In order to solve the existing problem of background technology; The utility model is taked following technical scheme: it comprises the first isolated form CAN transceiver U1, the second isolated form CAN transceiver U2, a CAN controller U3, the 2nd CAN controller U4 and two terminal resistance R1, R2; The first isolated form CAN transceiver U1 links to each other with a CAN controller U3; The CTXD3 end of the one CAN controller U3 links to each other with the CRXD4 end of the 2nd CAN controller U4; The CRXD3 end of the one CAN controller U3 links to each other with the CTXD4 end of the 2nd CAN controller U4; The 2nd CAN controller U4 links to each other with the second isolated form CAN transceiver U2, and described two isolated form CAN transceiver U1, U2 connect two CAN networks respectively through its CANH1 end, CANL1 end and CANH2 end, CANL2 end; Said two terminal resistance R1, R2 are separately positioned between the CANH1 end, CANL1 end of said two isolated form CAN transceivers and CANH2 end, CANL2 end between.

The utility model not only can enlarge the communication distance of CAN bus, can also increase the number of CAN bus node.And have signal flow to automatically switch, do not have the forwarding of delay, baud rate self-adapting, conversion transparent, support characteristics such as all user's upper layer application protocol, circuit are simple and reliable, practical.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Embodiment:

With reference to Fig. 1; This embodiment is taked following technical scheme: it comprises the first isolated form CAN transceiver U1, the second isolated form CAN transceiver U2, a CAN controller U3, the 2nd CAN controller U4 and two terminal resistance R1, R2; The first isolated form CAN transceiver U1 links to each other with a CAN controller U3; The CTXD3 end of the one CAN controller U3 links to each other with the CRXD4 end of the 2nd CAN controller U4; The CRXD3 end of the one CAN controller U3 links to each other with the CTXD4 end of the 2nd CAN controller U4; The 2nd CAN controller U4 links to each other with the second isolated form CAN transceiver U2, and described two isolated form CAN transceiver U1, U2 connect two CAN networks respectively through its CANH1 end, CANL1 end and CANH2 end, CANL2 end; Said 2 two terminal resistance R1, R2 are separately positioned between the CANH1 end, CANL1 end of said two isolated form CAN transceivers and CANH2 end, CANL2 end between.

This embodiment not only can enlarge the communication distance of CAN bus, can also increase the number of CAN bus node.And have signal flow to automatically switch, do not have the forwarding of delay, baud rate self-adapting, conversion transparent, support characteristics such as all user's upper layer application protocol, circuit are simple and reliable, practical.

Claims

1.CAN repeater; It is characterized in that it comprises the first isolated form CAN transceiver (U1), the second isolated form CAN transceiver (U2), a CAN controller (U3), the 2nd CAN controller (U4) and two terminal resistances (R1, R2); The first isolated form CAN transceiver (U1) links to each other with a CAN controller (U3); The CTXD3 end of the one CAN controller (U3) links to each other with the CRXD4 end of the 2nd CAN controller (U4); The CRXD3 end of the one CAN controller (U3) links to each other with the CTXD4 end of the 2nd CAN controller (U4); The 2nd CAN controller (U4) links to each other with the second isolated form CAN transceiver (U2), and described two isolated form CAN transceivers (U1, U2) connect two CAN networks respectively through its CANH1 end, CANL1 end and CANH2 end, CANL2 end; Said two terminal resistances (R1, R2) are separately positioned between the CANH1 end, CANL1 end of said two isolated form CAN transceivers and CANH2 end, CANL2 end between.