CN214504405U

CN214504405U - Integrated signal conversion device of optical communication test system

Info

Publication number: CN214504405U
Application number: CN202121095954.7U
Authority: CN
Inventors: 李伊晨; 王志文; 王欣圆; 贺亮
Original assignee: Dalian Youxun Technology Co Ltd
Current assignee: Dalian Youxinguang Technology Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-10-26
Anticipated expiration: 2031-05-21

Abstract

The utility model belongs to the technical field of serial port communication, a signal conversion equipment is synthesized to optical communication test system is provided, switch the module including power supply and voltage conversion module, signal processing module and signal type. The power supply and voltage conversion module is provided with 5V voltage by an external DC power supply, and then outputs 3.3V voltage through the voltage reduction chip for supplying power to the signal processing module; the signal processing module firstly realizes the mutual conversion between USB and TTL signals, and then respectively realizes the communication conversion between TTL and RS232, between TTL and RS422 and between TTL and RS485 through corresponding chips and peripheral circuits; the signal type switching module can realize the switching of communication between the USB and different UART signal types by switching the working sub-module. The utility model discloses have very strong compatibility, expansibility, communication reliability, portability.

Description

Integrated signal conversion device of optical communication test system

Technical Field

The utility model belongs to the technical field of serial port communication, a signal conversion equipment is synthesized to optical communication test system is related to, concretely relates to realize comprehensive signal conversion system of USB and the mutual communication of multiple UART type.

Background

The USB-to-serial port realizes the mutual conversion from the USB interface of the computer to the universal serial port, provides a quick channel for the computer without the serial port, and can be realized by means of the signal conversion between the USB and the serial port when various testing instruments such as an error code instrument, an attenuator, a power meter and the like communicate with a PC end in an optical communication test. Moreover, the use of USB to serial devices is equivalent to changing traditional serial devices into plug-and-play USB devices. As the most widely used USB interface, one of the indispensable communication interfaces of each computer has the biggest characteristics of supporting hot plug and play, and having fast transmission speed. For most engineers, the major obstacles to developing USB2.0 interface products are: the method is to face a complex USB2.0 protocol, write a driver of the USB device by self and be familiar with the programming of a singlechip. This not only requires a considerable VC programming experience, but also enables the programming of the hardware (firmware) of the USB interface. Most people give up developing USB products themselves. To simplify the complex problem, a USB to serial module may be used. The module can be regarded as a converter of a USB2.0 protocol, and converts a USB2.0 interface of a computer into a transparent parallel bus just like a singlechip bus. So that the design of the USB2.0 product can be completed within a few days. The most extensive field of modern industrial control needs to be the RS232, RS422 and RS485 parallel port interface, the development history is long, and the field is widely applied to many fields, for example, some programming enthusiasts can use serial ports when using a programmer. And other mechanical control systems and access control systems can not communicate by using RS232 and RS 485. The traditional mainboard has the interface, but because the market positioning of the mainboard is different, many new mainboards do not have serial interfaces, for example, a notebook computer rarely has the old interfaces. The USB interface is used for replacing most other communication interfaces, so that some mainboards encounter difficulties when being connected with RS232 serial ports or parallel ports for communication. Some manufacturers have proposed a series of products to solve the problem, but all of them can only implement the communication between a single serial port and USB, and are not careful in the case of USB and various types of UART communication.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that above-mentioned exists, a realize comprehensive signal conversion system of USB and the mutual communication of multiple UART type is proposed, and this system passes through signal type switching module, can realize TTL, RS232, RS422, the four kinds of UART types of RS485 and the both-way communication between the USB. The method has the advantages of strong compatibility, wide applicability, high practicability and the like.

The technical scheme of the utility model is that:

a comprehensive signal conversion device of an optical communication test system realizes the mutual conversion of USB and TTL, USB and RS232, USB and RS422 and USB and RS485 signals;

the integrated signal conversion device of the optical communication test system comprises a power supply and voltage conversion module, a signal processing module and a signal type switching module;

the power supply and voltage conversion module comprises two input interfaces, one is an external DC power supply interface, and the other is a USB signal interface; an external DC power supply provides 5V voltage, and then 3.3V voltage is output through a voltage reduction chip and used for supplying power to the signal processing module;

the signal processing module realizes the mutual conversion between USB and TTL signals, the power supply and voltage conversion module is connected with the power input end of the signal processing module, the USB signal end is connected with the signal processing module, and the signal processing module is connected with the UART signal end, namely, the communication between the USB and a certain specified type of UART is realized; the USB signal is converted into a TTL signal through a circuit module taking the CP2102 as a core; the TTL signal respectively realizes communication conversion between TTL and RS232, TTL and RS422 and TTL and RS485 through a chip and a peripheral circuit corresponding to the signal processing module;

the signal type switching module comprises a plurality of working sub-modules, is used for setting the interface communication type of the UART end and respectively corresponds to RS232, RS422 and RS485 signals; and the communication conversion between TTL and RS232, TTL and RS422 and TTL and RS485 is realized by switching the working submodules.

The power supply and voltage conversion module needs an external DC power supply to provide 5V voltage to supply power to the module, 3.3V voltage output by the voltage reduction chip is connected with the signal processing module to supply power to the signal processing module, meanwhile, the signal processing module needs to be connected with a USB interface of the communication end to serve as one end of a USB signal source, the interface type of the UART signal end is selected through the signal type switching module and is connected with the UART signal source end, and therefore bidirectional communication between the USB and UART interfaces of different types is achieved.

The method comprises the following specific steps:

(1) the input end of the power supply and voltage conversion module is connected with an external power supply, the external power supply is a DC power supply with a voltage value of 5V, and the power supply and voltage conversion module can output direct current of 5V and 3.3V and is connected to the signal processing module;

(2) interface communication types of the UART end, such as TTL, RS232, RS422, RS485 and the like, are set through the signal type switching module;

(3) the power supply and voltage conversion module is connected with the power input end of the signal processing module, the USB signal end is connected with the signal processing module, and the signal processing module is connected with the UART signal end, so that the communication between the USB and a certain specified type of UART can be realized.

The utility model has the advantages that:

(1) the utility model has strong compatibility and expansibility, can adjust aiming at UARTs with different serial port types, and realizes the two-way communication with a USB interface;

(2) the utility model discloses have very strong communication reliability, signal type switches module can effectually avoid clutter and crosstalk between the different signal types for the error rate in the communication process effectively reduces.

(3) The utility model discloses have fine portability, saved raw and other materials, with traditional 4 well UART interface communication types of most commonly used compatible to a product, the effectual product size that has reduced to manufacturing cost has been reduced.

Drawings

Fig. 1 is a schematic diagram of an integrated signal conversion device of an optical communication test system.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

Example 1: optical communication test system computer (USB) and optical communication tester error code device (RS232)

(1) Connecting a plug of an RS232 path of the USB communication board with a definition corresponding to a male head of a serial port, wherein RXD is connected with a pin 2, TXD is connected with a pin 3, and GND is connected with a pin 5;

(2) opening the error code meter, and connecting the serial port female head with the male head of the communication board RS 232;

(3) connecting the USB plug of the USB communication board with the computer, opening the debugging software and the corresponding port, and connecting the Baud with the computer

The rate is set to 115200, and the display or transmission is carried out according to 16 systems;

(4) sending 'fd fd' in serial port debugging software sending area, and receiving information of related parameters sent back by error code meter

Information processing device

(5) The normal work of the RS232 path of the USB communication board can be verified.

Example 2: optical communication test system computer (USB) and optical communication tester attenuator (RS232)

(1) Connecting a plug of a RS422 path of the USB communication board with a definition corresponding to a male head of a serial port, wherein a pin 1 of the plug is connected with a pin 3 of the serial port, a pin 2 of the plug is connected with a pin 4, a pin 3 of the plug is connected with a pin 1, and a pin 4 of the plug is connected with a pin 2;

(2) giving an attenuator to a communication test instrument, and connecting a serial port female head of the attenuator with a male head of a communication board RS 422;

(3) connecting a USB plug of the USB communication board with a computer, opening debugging software, setting the baud rate to be 9600, and setting a receiving area to be displayed according to a 16-system mode;

(4) and opening the corresponding port, and the receiving area receives the information and the related parameters sent by the attenuator every 28ms, so that the normal work of the RS422 channel of the USB communication board can be verified.

Claims

1. The integrated signal conversion device of the optical communication test system is characterized in that the integrated signal conversion device of the optical communication test system realizes the mutual conversion of USB and TTL, USB and RS232, USB and RS422 and USB and RS485 signals;