CN201509189U

CN201509189U - 485 interface converter

Info

Publication number: CN201509189U
Application number: CN2009201973737U
Authority: CN
Inventors: 孙新江
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-24
Filing date: 2009-09-24
Publication date: 2010-06-16
Anticipated expiration: 2019-09-24

Abstract

The utility model provides a 485 interface converter, which includes a 232 interface module, a level conversation module, an optical-coupling insulation module and a 485 interface module, wherein the 232 interface module, the level conversation module, the optical-coupling insulation module and the 485 interface module are sequentially connected; the data of the 485 interface module is subjected to the anti-interference through the optical-coupling insulation module, converted to the RS 232 standards through the level conversation module, and sent into the 232 interface module; the RS 232 data is received by the 232 interface module, converted to 485 TTL level through the level conversation module, subjected to the anti-interference through the optical-coupling insulation module, and sent to the 485 interface module; therefore, the 485 communication mode data and the RS 232 communication mode data can be converted. The RS 232 interface is a common communication interface in computer, thereby bringing conveniences to the computer management and development of 485 data communication.

Description

485 interface convertors

Technical field:

The utility model relates to a kind of communication interface equipment, especially a kind of 485 interface convertors.

Background technology:

Commonly used in the industry advantage of 485 data communications is the distance of communication to 485 data communication patterns, and is anti-interference strong, but 485 data communications are relatively more professional, do not have 485 communication interfaces of standard on the computer, and this has brought inconvenience for communication management and exploitation.

Summary of the invention:

For overcoming the inconvenience of above-mentioned 485 data communications, the utility model provides a kind of 485 interface convertors.

The utility model comprises 232 interface modules, level switch module, light-coupled isolation module, 485 interface modules, it is characterized in that, 232 interface modules, level switch module, light-coupled isolation module, 485 interface modules connect successively, the data of 485 interface modules by the light-coupled isolation module anti-interference after, the level that converts the RS232 standard by level switch module to is sent into 232 interface modules; RS232 data that 232 interface modules are received become 485 Transistor-Transistor Logic level through level switch module after, send into 485 interface modules by the light-coupled isolation module after anti-interference, the data of such 485 communication modes just can be changed with the data of RS232 communication mode, the RS232 interface is a communication interface common in the computer, and this has brought convenience just for the computer management and the exploitation of 485 data communications.

The beneficial effects of the utility model are, realize automatic data transaction, make things convenient for the intervention management and the exploitation of computer, have higher utility, economic worth.

Description of drawings:

Fig. 1 is a schematic diagram of the present utility model, and Fig. 2 is the utility model electricity structure chart.

Embodiment:

As shown in Figure 1, the utility model comprises 232 interface modules 1, level switch module 2, light-coupled isolation module 3,485 interface modules 4,232 interface modules 1, level switch module 2, light-coupled isolation module 3,485 interface modules 4 connect successively, the data of 485 interface modules 4 by light-coupled isolation module 3 anti-interference after, the level that converts the RS232 standard by level switch module 2 to is sent into 232 interface modules 1; Behind the Transistor-Transistor Logic level that the RS232 data process level switch module that 232 interface modules 1 are received is 2 one-tenth 485, send into 485 interface modules 4 by light-coupled isolation module 3 after anti-interference, the data of such 485 communication modes just can be changed with the data of RS232 communication mode.

As shown in Figure 2, in the RS485 transition of communications circuit, level shifting circuit and RS485 bus are isolated, improve the antijamming capability of system by optocoupler.Adopt SP485E to support the RS485 serial protocol; SP485E is a kind of half-duplex difference transceiver; they satisfy the requirement of RS485 serial protocol fully; has enhancement mode ESD performance; message transmission rate can be up to 10Mbps; but because the work-based logic of SP485E is a Transistor-Transistor Logic level; and according to the regulation of the communications protocol of RS232 on the PC; their standard logic level is at ± 12V; need carry out level conversion by the SP232 device; RS485 is operated in the half-duplex operation state; I/O direction by the CTR485 control data; TVS pipe in the circuit is connected in parallel on RS485 bus A; the transient protective effect is carried out to circuit in B line two ends, and biasing resistor carries out the network failure protection.DB9 then is the RS232 interface of accepted standard, and the computer RS232 (serial ports) of energy and standard docks.

Claims

1. interface convertor, comprise 232 interface modules (1), level switch module (2), light-coupled isolation module (3), 485 interface modules (4), it is characterized in that 232 interface modules (1), level switch module (2), light-coupled isolation module (3), 485 interface modules (4) connect successively.