CN202172407U

CN202172407U - Photoelectric communication converter

Info

Publication number: CN202172407U
Application number: CN2011202195190U
Authority: CN
Inventors: 李宗方; 陈智; 张玉兰; 樊筱莹
Original assignee: Beijing Hitachi Control Systems Co Ltd
Current assignee: Beijing Hitachi Control Systems Co Ltd
Priority date: 2011-06-27
Filing date: 2011-06-27
Publication date: 2012-03-21
Anticipated expiration: 2021-06-27

Abstract

The utility model provides a photoelectric communication converter, comprising an RS-485 interface, an RS-485 driving chip, an RS-485 half-duplex directional control circuit and a TTL level transmit-receive one-body optical module, wherein the RS-485 driving chip is respectively connected with the RS-485 interface, the RS-485 half-duplex directional control circuit and the TTL level transmit-receive one-body optical module. Compared with the prior art, beneficial effects of the novel photoelectric communication converter are that realization of circuits is simple, and production cost can be effectively reduced; a power supply interface is agile, and a communication cable can supply power to the outside or get power from the outside; and the converter is realized by pure hardware, reliability of the converter is high, the RS-485 communication is half-duplex, and duplex direction can be automatically switched by the hardware.

Description

The photoelectric communication transducer

[technical field]

The utility model belongs to electronic information technology and communication technical field, relates in particular to RS-485 photoelectric communication transducer.

[background technology]

In recent years, the optical fiber new technology continue to bring out the application power that has increased substantially optical fiber, and constantly enlarge the range of application of optical fiber communication.Optical fiber communication has been widely used in many aspects such as industry, electric power, military affairs, Aero-Space, biomedicine because of its good transmission characteristic.RS-485 is a kind of communication standard that utilizes the differential transfer mode to increase communication distance and improve reliability, is widely used in the industrial instrument, but under the communications applications condition of longer distance, uses still very limited.

[utility model content]

The technical problem that the utility model solved is to provide a kind of photoelectric communication transducer, and this transducer can be realized the mutual conversion of RS-485 differential electric signal and light signal, can effectively prolong the communication distance of RS-485 communication equipment.

For solving the problems of the technologies described above; The utility model adopts following technical scheme: a kind of photoelectric communication transducer; It comprises RS-485 interface, RS-485 chip for driving, RS-485 half-duplex directional control circuit and Transistor-Transistor Logic level optical fiber transceiver module, and said RS-485 chip for driving is connected with said RS-485 interface, RS-485 half-duplex directional control circuit, Transistor-Transistor Logic level optical fiber transceiver module respectively.

Further, comprise that also SC interface Transistor-Transistor Logic level optical fiber transceiver module, optical fiber change indicator light, RS-485 to optical fiber to RS-485 and change indicator light, RS-485 communication interface, power input interface and power supply indicator.

Further, this transducer is accomplished the switching of RS-485 half-duplex direction automatically by hardware.

Further, also comprise power input interface and telecommunication cable, said telecommunication cable can externally be supplied power or from external electricity.

Compared to prior art, the beneficial effect of the utility model optical fiber RS-485 transducer is: circuit is realized simple, can effectively reduce production costs; Power supply interface is flexible, and telecommunication cable can externally be supplied power or from external electricity; And transducer adopts pure hardware to realize, reliability is high, and RS-485 communication is half-duplex, and duplex directions is automaticallyed switch by hardware.

[description of drawings]

Fig. 1 is the circuit structure schematic diagram of the described RS-485 photoelectric communication of the utility model transducer.

Fig. 2 is the interface structure sketch map of the described RS-485 photoelectric communication of the utility model transducer.

Fig. 3 is the application sketch map of the described RS-485 photoelectric communication of the utility model transducer when realizing the distant signal transmission.

[embodiment]

For ease of the utility model is further understood, combine accompanying drawing and specific embodiment that the utility model is described in detail at present.

The described RS-485 photoelectric communication of the utility model transducer; Its structure principle chart is as shown in Figure 1, and it comprises Transistor-Transistor Logic level optical fiber transceiver module 1, RS-485 half-duplex directional control circuit 2, RS-485 chip for driving 3, RS-485 communication interface 4 and power circuit 5.Said RS-485 chip for driving 3 is connected with RS-485 communication interface 4, RS-485 half-duplex directional control circuit 2, Transistor-Transistor Logic level optical fiber transceiver module 1 respectively, and Transistor-Transistor Logic level optical fiber transceiver module 1 is connected with RS-485 half-duplex directional control circuit 2, RS-485 chip for driving 3 respectively.Said power circuit 5 provides power supply for whole module.

The basic functional principle of said RS-485 photoelectric communication transducer is: the RS-485 chip for driving is operated in the half-duplex state; When the Transistor-Transistor Logic level optical fiber transceiver module did not detect the light signal input, the half-duplex directional control circuit can be controlled RS-485 chip for driving driving optical module and convert 485 differential signals into light signal; When the Transistor-Transistor Logic level optical fiber transceiver module detected the light signal input, the half-duplex directional control circuit can be controlled the RS-485 chip for driving and convert light signal into 485 differential signals.

Said RS-485 photoelectric communication transducer is supported the mutual conversion of optical fiber and RS-485 half-duplex operation; Its outward appearance and interface structure sketch map are as shown in Figure 2, and it comprises: SC interface Transistor-Transistor Logic level optical fiber transceiver module 1, optical fiber to RS-485 conversion indicator light 2, RS-485 are to optical fiber conversion indicator light 3, RS-485 communication interface 4, power input interface 5 and power supply indicator 6.

As shown in Figure 3, there are 5 RS-485 equipment to link together and communicate, wherein the communication distance of equipment 1, equipment 3 and equipment 5 is far away, needs to prolong communication distance.Can be earlier the bus cable differential electric signal be converted into via RS-485 photoelectric communication transducer and be transferred to behind the light signal more at a distance, and then after another RS-485 photoelectric communication transducer changes 485 differential electric signal into, be connected on the corresponding RS-485 equipment.

In order to overcome the application limitations of RS-485 under longer communication distance condition; The RS-485 photoelectric communication transducer that the utility model provides can be realized the mutual conversion of RS-485 differential signal and light signal; Can effectively prolong the communication distance of RS-485 communication equipment; And its circuit is realized simple, can effectively reduce production costs; Power supply interface is flexible, and telecommunication cable can externally be supplied power or from external electricity; And transducer adopts pure hardware to realize, reliability is high, and RS-485 communication is half-duplex, and duplex directions is automaticallyed switch by hardware.

The above only is the most preferred embodiment of the utility model, is not the utility model is done any pro forma restriction, all belongs within the scope of the utility model technical scheme.Any those of ordinary skill in the art are not breaking away under the utility model technical scheme scope situation, utilize the method content of above-mentioned announcement that the utility model technical scheme is made many possible changes and modification, all belong to the scope of claims protection.

Claims

1. photoelectric communication transducer; It is characterized in that: it comprises RS-485 interface, RS-485 chip for driving, RS-485 half-duplex directional control circuit and Transistor-Transistor Logic level optical fiber transceiver module, and said RS-485 chip for driving is connected with said RS-485 interface, RS-485 half-duplex directional control circuit, Transistor-Transistor Logic level optical fiber transceiver module respectively.

2. photoelectric communication transducer according to claim 1 is characterized in that: comprise that also SC interface Transistor-Transistor Logic level optical fiber transceiver module, optical fiber change indicator light, RS-485 to optical fiber to RS-485 and change indicator light, RS-485 communication interface, power input interface and power supply indicator.

3. photoelectric communication transducer according to claim 1 is characterized in that: this transducer is accomplished the switching of RS-485 half-duplex direction automatically by hardware.

4. photoelectric communication transducer according to claim 1 is characterized in that: also comprise power input interface and telecommunication cable, said telecommunication cable can externally be supplied power or from external electricity.