CN207650801U

CN207650801U - A kind of 485 telecommunication circuits

Info

Publication number: CN207650801U
Application number: CN201820015627.8U
Authority: CN
Inventors: 戚许秋; 李玮
Original assignee: Changzhou Vocational Institute of Engineering
Current assignee: Changzhou Vocational Institute of Engineering
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2018-07-24
Anticipated expiration: 2028-01-05

Abstract

The utility model discloses a kind of 485 telecommunication circuits, 485 telecommunication circuit includes the first photo-coupler, the second photo-coupler, triode, 485 bus marco chips of RS, 485 communication port of the first TVS pipe, the second TVS pipe and RS, wherein, first photo-coupler is connected to the R pins of 485 bus marco chips of the RS；Second photo-coupler connects the DE/RE pins of 485 bus marco chips of the RS by the triode end all the way, and another way connects the D pins of 485 bus marco chips of the RS；The A pins of 485 bus marco chips of the RS are connect with 485 communication port of RS, and therebetween and connect first TVS pipe；The B pins of 485 bus marco chips of the RS are connect with 485 communication port of RS, and therebetween and connect the second TVS pipe, and first TVS pipe and the second TVS pipe with system power supply are connect；485 telecommunication circuit provided by the utility model is suitable for various working environments, has a wide range of application, and has good stability, anti-interference and fluency.

Description

A kind of 485 telecommunication circuits

Technical field

The utility model is related to circuit design fields, more particularly to a kind of 485 telecommunication circuits.

Background technology

Since 485 communications are with good noise immunity and longer transmission range and with multi-computer communication etc. Advantage, therefore 485 communications are widely used in every field, but in some special cases, in order to pass through 485 communications Complete some operations, it may be necessary to carry out some special operations, such as when inputting instantaneous high pressures to 485 communications, may cause The acp chip damage of 485 communications, and 485 telecommunication circuits is caused to collapse and can not work, in addition, under some rugged environments Using 485 communications or certain influence and interference can be generated to communication because of environmental problem, so as to cause the failure of communication, Cause some unnecessary losses.

Utility model content

The purpose of this utility model is that for the technical problems in the prior art, a kind of 485 telecommunication circuits are provided, Specific technical solution is as follows：

A kind of 485 telecommunication circuits, 485 telecommunication circuit include the first photo-coupler, the second photo-coupler, triode, RS-485 bus marcos chip, the first TVS（TRANSIENT VOLTAGE SUPPRESSOR）Pipe, the second TVS pipe and RS- 485 communication port, wherein：

First photo-coupler is connected to the R pins of the RS-485 bus marcos chip；

Second photo-coupler connects the DE/RE of the RS-485 bus marcos chip by the triode end all the way Pin, another way connect the D pins of the RS-485 bus marcos chip；

The A pins of the RS-485 bus marcos chip are connect with RS-485 communication port, and therebetween and meet institute State the first TVS pipe；The B pins of the RS-485 bus marcos chip are connect with RS-485 communication port, and therebetween simultaneously The second TVS pipe is connect, first TVS pipe and the second TVS pipe with system power supply are connect.

Further, 485 telecommunication circuit further includes fuse, and the fuse connects with the RS-485 communication port It connects.

Further, first photo-coupler includes the first light emitting source and the first light-receiving device, first light emitting source Plus earth power supply, the cathode of the first light emitting source connects the R pins of the RS-485 bus marcos chip by resistance R2, described First light-receiving device connects the RDX1 pins of Micro-processor MCV；

Second photo-coupler includes the second light emitting source and the second light-receiving device, the plus earth electricity of second light emitting source Source, the cathode of second light emitting source is by the TDX1 pins of resistance R8 connection Micro-processor MCVs, and second light-receiving device is all the way It is connect with the DE/RE pins of RS-485 bus marco chips by triode, another way connects the D of RS-485 bus marco chips Pin.

Further, the D pins of the RS-485 bus marcos chip pull up a resistance R3 and are connect with triode, and R draws Foot pulls up a resistance R2 and is connected with the cathode of first photophore.

Further, the A pins of the RS-485 bus marcos chip pull up a resistance R5 and are connect with bus power source, and The resistance R5 and first TVS pipe simultaneously connect, and B pins pull down a resistance R6 connections systematically power supply, and the resistance R6 With second TVS pipe and connect.

Further, the base stage of the triode passes through resistance R3 connections second photo-coupler；The transmitting of triode Pole connects power supply；The collector of triode connects resistance R4 and is connect with ground power supply all the way, connects the total line traffic controls of the RS-485 all the way The DE/RE pins of coremaking piece.

485 telecommunication circuit provided by the utility model, on the one hand by RS-485 bus marcos chip and microprocessor The first photo-coupler of setting and the second photo-coupler among the circuit of connection can realize the work(of isolation interference by photo-coupler Can, the stability of RS-485 bus marco chip communications is improved, meanwhile, by the second photo-coupler and the total line traffic controls of RS-485 Coremaking piece, which connects, is arranged a triode on circuit, controlled the transmitting-receiving of RS-485 bus marco chips by triode, Realize half-duplex operation；On the other hand, by the circuit between RS-485 bus marcos chip and RS-485 communication port First TVS pipe and the second TVS pipe are set, and TVS pipe grounding connection is set, meanwhile, the insurance being connect with systematically power supply is set Silk, ensure that entire circuit will not damage RS-485 bus marco chips in high voltage transient, so as to cause entire communication Circuit collapses；485 telecommunication circuit provided by the utility model can be very good to adapt to various operating environments, easy to spread, can The acp chip for protecting communication ensure that the progress of communication process, improve the stability and reliability of communication.

Description of the drawings

Fig. 1 is the circuit diagram of 485 telecommunication circuit of the utility model embodiment.

Specific implementation mode

In order to make those skilled in the art more fully understand the utility model, below in conjunction with the utility model reality The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.Obviously, described Embodiment is only that the utility model a part of the embodiment gives the utility model instead of all the embodiments in attached drawing Preferred embodiment.The utility model can be realized in many different forms, however it is not limited to embodiment described herein, It is made the understanding of the disclosure of the utility model more thorough and comprehensive on the contrary, purpose of providing these embodiments is.It is based on The embodiments of the present invention, those of ordinary skill in the art are obtained all without creative efforts Other embodiment shall fall within the protection scope of the present invention.

In conjunction with Fig. 1, in the utility model embodiment, 485 telecommunication circuit includes the first photo-coupler, the second optocoupler Clutch, triode, RS-485 bus marcos chip, the first TVS pipe, the second TVS pipe and RS-485 communication port, wherein institute State the R pins that the first photo-coupler is connected to the RS-485 bus marcos chip；Second photo-coupler passes through institute all the way The DE/RE pins that triode end connects the RS-485 bus marcos chip are stated, another way connects the RS-485 bus marcos The D pins of chip, the first photo-coupler and the second photo-coupler are interfered for being isolated, and ensure that the fluency of 485 telecommunication circuits And stability；The A pins of the RS-485 bus marcos chip are connect with RS-485 communication port, in the A pins and RS- Circuit between 485 communication port also and connects first TVS pipe, and the first TVS pipe other end with system power supply is connect；It is described The B pins of RS-485 bus marco chips are connect with RS-485 communication port, between the B pins and RS-485 communication port Circuit also and connect second TVS pipe, the first TVS pipe other end with system power supply is connect；In the utility model embodiment In, first TVS pipe and the second TVS pipe ensure when 485 telecommunication circuits input transient voltage not for suppressing transient voltage RS-485 bus marco chips can be damaged, ensure that entire 485 telecommunication circuit can continue to run, there is very high reliability.

In the utility model embodiment, the RS-485 bus marcos chip model is MAX3085ESA, certainly, this reality It is not limited and is fixed with new embodiment, the core for selecting suitable 485 telecommunication circuit can be carried out according to actual conditions Piece.

In the utility model embodiment, the D pins of the RS-485 bus marcos chip pull up a resistance R3 and three Pole pipe connects, and R pins pull up a resistance R2 and are connected with the cathode of first photophore；The RS-485 bus marcos chip A pins pull up a resistance R5 and connect with bus power source, the resistance R5 and the first TVS pipe simultaneously connect；B pins pull down an electricity Hinder R6 connections systematically power supply, the resistance R6 and the second TVS pipe simultaneously connect.

In the utility model embodiment, it is additionally provided with a fuse, the fuse is connect with RS-485 communication port, External equipment for protecting access RS-485 communication port.

In the utility model embodiment, first photo-coupler includes the first light emitting source and the first light-receiving device, described The cathode of the plus earth power supply of first light emitting source, the first light emitting source passes through the resistance R2 connections RS-485 bus marcos chip R pins, the RDX1 pins of first light-receiving device connection Micro-processor MCV；Second photo-coupler includes second luminous The cathode of source and the second light-receiving device, the plus earth power supply of second light emitting source, second light emitting source is connected by resistance R8 The TDX1 pins of Micro-processor MCV are connect, second light-receiving device passes through the DE/ of triode and RS-485 bus marco chips all the way RE pins connect, and in the utility model embodiment, the base stage of the triode passes through resistance R3 connections second optical coupling Device；The emitter of triode connects power supply；The collector of triode connects resistance R4 and is connect with ground power supply all the way, connects institute all the way State the DE/RE pins of RS-485 bus marco chips；In the utility model embodiment, installing the triode can be logical to 485 Letter circuit carries out transmitting-receiving control, realizes half-duplex operation, and specially triode can carry out the signal by triode reversed Processing, circuit has been achieved cannot receive signal when sending signal, likewise, cannot be sent out when receiving signal On the one hand the number of delivering letters prevents in communication process and generates unnecessary interference, another party since receiving and transmitting signal is carried out at the same time in this way Face saves the quantity of interface, simplifies circuit；The D of transistor collector another way connection RS-485 bus marco chips draws Foot.

It these are only the embodiments of the present invention, be not intended to limit the scope of the claims of the utility model, although with reference to before Embodiment is stated the utility model is described in detail, it, still can be right for those skilled in the art comes Technical solution recorded in aforementioned each specific implementation mode is modified, or carries out equivalent replace to which part technical characteristic It changes.Every equivalent structure done using the utility model specification and accompanying drawing content is directly or indirectly used in other correlations Technical field, similarly within the utility model patent protection domain.

Claims

1. a kind of 485 telecommunication circuits, which is characterized in that 485 telecommunication circuit includes the first photo-coupler, the second optical coupling Device, triode, RS-485 bus marcos chip, the first TVS pipe, the second TVS pipe and RS-485 communication port, wherein：

First photo-coupler is connected to the R pins of the RS-485 bus marcos chip；

The DE/RE that second photo-coupler connects the RS-485 bus marcos chip by the triode end all the way draws Foot, another way connect the D pins of the RS-485 bus marcos chip；

The A pins of the RS-485 bus marcos chip are connect with RS-485 communication port, and therebetween and connect described One TVS pipe；The B pins of the RS-485 bus marcos chip are connect with RS-485 communication port, and therebetween and connect Two TVS pipes, first TVS pipe and the second TVS pipe with system power supply are connect.

2. 485 telecommunication circuit according to claim 1, which is characterized in that 485 telecommunication circuit further includes fuse, The fuse is connect with the RS-485 communication port.

3. 485 telecommunication circuit according to claim 1, which is characterized in that first photo-coupler includes first luminous The cathode of source and the first light-receiving device, the plus earth power supply of first light emitting source, the first light emitting source passes through resistance R2 connections institute State the R pins of RS-485 bus marco chips, the RDX1 pins of the first light-receiving device connection Micro-processor MCV；

Second photo-coupler include the second light emitting source and the second light-receiving device, the plus earth power supply of second light emitting source, The cathode of second light emitting source passes through the TDX1 pins of resistance R8 connection Micro-processor MCVs, the second light-receiving device a-road-through It crosses triode to connect with the DE/RE pins of RS-485 bus marco chips, the D of another way connection RS-485 bus marco chips draws Foot.

4. 485 telecommunication circuit according to claim 3, which is characterized in that the D pins of the RS-485 bus marcos chip One resistance R3 of pull-up is connect with triode, and R pins pull up a resistance R2 and are connected with the cathode of first photophore.

5. 485 telecommunication circuit according to claim 1, which is characterized in that the A pins of the RS-485 bus marcos chip One resistance R5 of pull-up is connect with bus power source, and the resistance R5 and first TVS pipe and is connect, B pins one electricity of drop-down It hinders R6 connections systematically power supply, and the resistance R6 and second TVS pipe and connects.

6. 485 telecommunication circuit according to claim 1, which is characterized in that the base stage of the triode is connected by resistance R3 Connect second photo-coupler；The emitter of triode connects power supply；The collector of triode connects resistance R4 and ground electricity all the way Source connects, and connects the DE/RE pins of the RS-485 bus marcos chip all the way.

7. 485 telecommunication circuit according to claim 1, which is characterized in that the RS-485 bus marcos chip model is MAX3085ESA。