CN201937632U

CN201937632U - Universal serial port-to-network interface converter

Info

Publication number: CN201937632U
Application number: CN2011200161556U
Authority: CN
Inventors: 林宁
Original assignee: SHENZHEN SOWELL TECHNOLOGY Co Ltd
Current assignee: Shenzhen AOK Polytron Technologies Inc
Priority date: 2011-01-19
Filing date: 2011-01-19
Publication date: 2011-08-17
Anticipated expiration: 2021-01-19

Abstract

The utility model discloses a universal serial port-to-network interface converter, which comprises a serial port conversion circuit connected with an RS232 serial interface, a micro controller unit (MCU) micro controller, a network interface control circuit and a network interface circuit, wherein the serial port conversion circuit, the MCU micro controller, the network interface control circuit and the network interface circuit are sequentially connected. With the universal serial port-to-network interface converter, the conversion between an RS232 interface and a network interface can be achieved, and then the connection between a set-top box and a household personal computer (PC) can be achieved, and thus, the set-top box can be quickly and conveniently upgraded by users, accordingly, the needs of the users are met, the converter is durable, and the service cost is saved.

Description

A kind of universal serial port is to the adapter of network interface

Technical field

The utility model relates to the adapter of a kind of universal serial port to network interface.

Background technology

At present, along with the continuous development of digital television techniques, digital TV set-top box has entered huge numbers of families.Along with user's demand constantly changes renewal, a lot of users require set-top box is carried out the software upgrading upgrading, and these thousands upon thousands set-top box because listing relatively early, so and the outside exchanges data overwhelming majority all be to adopt the RS232 serial line interface.But the home PC that has the RS232 serial line interface in the market is fewer and feweri, the user want to set-top box upgrade and become voluntarily more and more impossible, have to pay extra service fee again if take the point of sale upgrading of appointment.Thereby, be necessary to provide a solution, the user can be in expediently voluntarily set-top box be upgraded.

Summary of the invention

The technical problems to be solved in the utility model is to provide the adapter of a kind of universal serial port to network interface, is applied to set-top box, realizes that the user can upgrade to set-top box by home PC voluntarily.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of universal serial port is to the adapter of network interface, and this adapter comprises: the serial ports change-over circuit that is connected with the RS232 serial line interface, MCU microcontroller, network interface control circuitry and network interface circuit; Described serial ports change-over circuit, MCU micro controller circuit, network interface control circuitry and network interface circuit connect successively.

Wherein, described MCU microcontroller adopts 8051 single-chip microcomputers.

Wherein, described MCU microcontroller adopts the STC89C58RD+ chip.

Wherein, described network interface control circuitry adopts the DM9008A chip.

Wherein, described network interface circuit comprises the RJ45 network socket and the 10/100M network transformer of connection.

The beneficial effects of the utility model are: adopt the utility model, can realize the switching of RS232 interface and network interface, can realize being connected of set-top box and home PC, and then realize that the user upgrades to set-top box quickly and easily voluntarily, user's needs have not only been satisfied, durable in use, and saved service fee.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

The universal serial port that Fig. 1 provides for the utility model is to the structural representation of the adapter of network interface.

The application schematic diagram of the adapter that Fig. 2 provides for the utility model embodiment.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

See also Fig. 1, serial ports provided by the utility model is made up of four parts to the adapter of network interface, is respectively: serial ports change-over circuit, MCU microcontroller, network interface control circuitry and network interface circuit, and these four parts connect successively, wherein

The serial ports change-over circuit is connected with the RS232 serial line interface, and in order to the RS232 interface level is converted to the needed Transistor-Transistor Logic level of MCU microcontroller, perhaps the Transistor-Transistor Logic level with the MCU microcontroller converts the output of RS232 interface level to;

The MCU microcontroller is used for network interface control circuitry is controlled, and the Control Network interface control circuit obtains network data by network interface circuit, afterwards network data is sent to the RS232 serial line interface by the serial ports change-over circuit; Perhaps will be sent to network by network interface control circuitry from the data of serial ports change-over circuit;

Network interface control circuitry is by the MCU microprocessor controls, by network interface circuit from the network transceive data.

See also Fig. 2, this figure is depicted as an embodiment of the present utility model.As shown in the figure, the MCU microcontroller adopts the STC89C58RD+ chip in the present embodiment, and network interface control circuitry adopts the DM9008A chip, and network interface circuit adopts the RJ45 socket; Wherein

Selected the core controller of general 8051 single-chip microcomputers (STC89C58RD+) in the present embodiment for use as this adapter, it is responsible for the DM9008A chip is controlled, obtain the RS232 interface that sends to set-top box after the network data by the serial ports change-over circuit from the DM9008A chip, perhaps the data from the RS232 interface of set-top box are sent to network by the DM9008A chip.In addition, easy serial ports change-over circuit is responsible for the Transistor-Transistor Logic level of 8051 single-chip microcomputers is converted to the RS232 interface level, also the RS232 interface level is converted to the needed Transistor-Transistor Logic level of 8051 single-chip microcomputers simultaneously.What deserves to be mentioned is, present embodiment is according to the different demands of different user, what select for use in this adapter is the single-chip microcomputer of the many LQFP44 pin encapsulation of serial model No., the transducer of more complex functions if desired can be changed the PCB design and directly select for use 8051 bigger series monolithics of program storage to be achieved.

More common DM9008A chip on the market that present embodiment is selected for use is a general purpose I C of Taiwan DAVECOM, it is inner integrated MAC and PHY two parts circuit, and its concrete internal work principle is not given unnecessary details at this.This scheme peripheral circuit is few, and design is produced all very convenient, is fit to very much produce in enormous quantities, and is verified in actual use also very reliable and stable.

Network interface circuit is a socket circuit in the present embodiment, RJ45 socket in the block diagram is a standard RJ45 network socket, add that in addition (its main purpose has been a buffer action to 10/100M network transformer commonly used in the network, be responsible for the signal of telecommunication of external network cable is coupled to the DM9008A chip, the signal of telecommunication of also being responsible for simultaneously the DM9008A chip is sent is coupled on the external network cable), finish the network physical linkage function.

When using, by can realize the data exchanging function of adapter to a spot of code of 8051 single-chip microcomputer programmings, to reach user's actual demand.

Above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, only with reference to preferred embodiment the utility model is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical solution of the utility model, and do not break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. a universal serial port is characterized in that this adapter comprises: the serial ports change-over circuit that is connected with the RS232 serial line interface, MCU microcontroller, network interface control circuitry and network interface circuit to the adapter of network interface; Described serial ports change-over circuit, MCU micro controller circuit, network interface control circuitry and network interface circuit connect successively.

2. universal serial port as claimed in claim 1 is characterized in that to the adapter of network interface described MCU microcontroller adopts 8051 single-chip microcomputers.

3. as the adapter of the described universal serial port of claim 2, it is characterized in that described MCU microcontroller adopts the STC89C58RD+ chip to network interface.

4. universal serial port as claimed in claim 1 is characterized in that to the adapter of network interface described network interface control circuitry adopts the DM9008A chip.

5. universal serial port as claimed in claim 1 is characterized in that to the adapter of network interface described network interface circuit comprises the RJ45 network socket and the 10/100M network transformer of connection.