CN203350870U

CN203350870U - Switching circuit based on multiplexing of multiple processor serial ports on veneer

Info

Publication number: CN203350870U
Application number: CN 201320320491
Authority: CN
Inventors: 高如正; 林珺
Original assignee: Fujian Star Net Communication Co Ltd
Current assignee: Fujian Star Net Communication Co Ltd
Priority date: 2013-06-05
Filing date: 2013-06-05
Publication date: 2013-12-18
Anticipated expiration: 2023-06-05

Abstract

The utility model provides a switching circuit based on multiplexing of multiple processor serial ports on a veneer. The switching circuit is placed on the veneer, and comprises at least two processors, a switching switch, a level shifter, a serial port switching control circuit and a panel serial port plug. The panel serial port plug is respectively connected with the level shifter and the serial port switching control circuit; the level shifter is respectively connected with a first processor and a second processor through the switching switch; pins of control signals of the serial port switching circuit are connected with the switching switch. The multiple processor serial ports share one panel serial port plug, the panel serial port plug can be connected to different processor serial ports through plug-out and plug-in, and therefore the space of the panel of the veneer is saved.

Description

A kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer

Technical field

The utility model relates to communication technical field, particularly a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer.

Background technology

In the communications device single board used in telecom communication, serial interface is the most frequently used Man Machine Interface.Although, in the network equipment, can realize and equipment mutual by network interface, once device network breaks down, and when needing on-line debugging to obtain Debugging message, serial interface becomes requisite interface.Serial interface is the debugging interface of the embedded board bottom, after general procedure starts, all can print a series of information for debugging by serial interface, minimum system also is based on serial communication simultaneously, can updating apparatus by serial interface, configuration device.Can design the debugging of a serial interface for veneer in general communications device single board, but the expansion along with the veneer function, current most of veneer starts to adopt multiprocessor to realize different business, each processor has stand alone software, equipment occur abnormal in, need to connect the state that different processors is checked equipment with serial interface.Current way mainly contains several as follows: one, on veneer, increase a plurality of serial interfaces, for connecting the serial ports of different processors.Two,, in single serial interface, define a plurality of Serial Port Lines.Three, receiving order by processor switches serial ports and is connected to different processors.

In technique scheme one, by increasing the serial ports socket, expand serial ports, can take unnecessary panel space, and give the unprofessional sensation of user.In technique scheme two, single serial ports socket defines a plurality of Serial Port Lines, although solved the problem that takies redundant space, due to different serial ports, adopted the cable of different definition, cause maintenance very inconvenient, the user is difficult to distinguish which Serial Port Line of this use to be connected.In technique scheme three, respond serial port command by processor and switch serial ports, implementation is generally that the serial interface acquiescence is connected on processor one, by to processor one, sending switching command, processor one is by universal input/output GPIO gauge tap, the RJ45 interface is connected in processor two, thereby completes the switching of serial ports.If it is exactly that equipment processor one in service breaks down that this implementation has a significantly drawback, can not respond the switching serial port command that computer sends, the user will can not be connected to other processors forever, thus good orientation problem.

Summary of the invention

The technical problems to be solved in the utility model, be to provide a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer, the panel space of having saved veneer.

The utility model is achieved in that a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer, described commutation circuit is arranged on veneer, and this commutation circuit comprises at least 2 processors, a switching switch, a level translator, a serial ports control switching circuit and a panel serial ports socket; Described panel serial ports socket connects respectively described level translator, serial ports control switching circuit, and this level translator connects respectively first processor and the second processor by change-over switch; The pin of the control signal of described serial ports commutation circuit is connected with described change-over switch.

Further, described panel serial ports socket is serial line interface DB9 socket or RJ45 socket.

Further, described serial ports control switching circuit comprises rectifier bridge, optical coupling isolation circuit and T trigger; Described T trigger is connected with described change-over switch; Described rectifier bridge is connected with described panel serial ports socket.

Further, the reception signal RX pin of described panel serial ports socket is connected to an interchange input pin of described rectifier bridge.

The utility model has the advantage of: the utility model can share a panel serial ports socket by the serial ports of a plurality of processors, the serial ports of first processor is connected with level translator through change-over switch, the serial ports of the second processor and level translator are disconnected; Insert a Serial Port Line and computer serial ports on panel serial ports socket after, the computer expert crosses Serial Port Line and first processor carries out serial communication; Communication is complete, and after operating personnel extract Serial Port Line, the Serial Port Line that the serial ports control switching circuit detects on panel serial ports socket is pulled out, and sends control signal to change-over switch; Change-over switch disconnects the connection of first processor and level translator, the second processor is connected with level translator simultaneously; Realize that the serial ports on panel serial ports socket switches and is connected with any processor serial port in veneer; It has saved the panel space of veneer.

The accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the structural representation of serial ports control switching circuit of the present utility model.

Embodiment

Refer to shown in Fig. 1 and Fig. 2, the utility model is a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer, it is upper that described commutation circuit is arranged at veneer (not shown), and this commutation circuit comprises at least 2 processors (first processor 1 and the second processor 2 are arranged in the present embodiment), a switching switch 3, a level translator 4, a serial ports control switching circuit 5 and a panel serial ports socket 6; Described panel serial ports socket 6 connects respectively described level translator 4, serial ports control switching circuit 5, and this level translator 4 connects respectively first processor 1 and the second processor 2 by change-over switch 3; The pin of the control signal of described serial ports commutation circuit 5 is connected with described change-over switch 3.

Wherein, described panel serial ports socket 6 is serial line interface DB9 socket or RJ45 socket.

In the utility model, described serial ports control switching circuit 5 comprises rectifier bridge 51, optical coupling isolation circuit 52 and T trigger 53; Described T trigger 53 is connected with described change-over switch 3; Described rectifier bridge 51 is connected with described panel serial ports socket 6.

Here it should be noted that: the reception signal RX pin of described panel serial ports socket 6 is connected with an interchange input pin of described rectifier bridge 51.Described change-over switch 3 can be the bidirectional analog switch for described change-over switch 3.

The principle of work of serial ports control switching circuit is as follows:

When panel serial ports socket is unsettled, the RX of panel serial ports socket and GND pin level equate, not conducting of optical coupling isolation circuit, and the input of T trigger is constant is high level, the output of T trigger is constant.When panel serial ports socket is connected with the computer serial ports by Serial Port Line, agreement according to RS232, when idle, on the RX pin, be-level of arrive-15V of 3V, when data are arranged, level between arrive+15V of there will be+3V, after rectifier bridge, can obtain a relative voltage that is greater than 3V, that is to say when Serial Port Line connects, the optical coupling isolation circuit conducting, the input end of T trigger becomes low level, and now a negative edge has appearred in T trigger input end, the T trigger is failure to actuate, and input signal becomes low level simultaneously.When pulling up Serial Port Line, the rectifier bridge output level is 0, not conducting of optical coupling isolation circuit, and T trigger input end becomes high level, is equivalent to occur a rising edge, and the upset of T trigger is controlled change-over switch and is switched between first processor and the second processor 2.

Can realize as mentioned above realizing that extracting Serial Port Line moment panel serial ports socket switches between the serial ports between first processor and the second processor.

In a word, the utility model realizes that the serial ports on panel serial ports socket switches and is connected with any processor serial port in veneer; It has saved the panel space of veneer.

The foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.

Claims

1. the multiplexing commutation circuit of a plurality of processor serial ports based on veneer, it is characterized in that: described commutation circuit is arranged on veneer, and this commutation circuit comprises at least 2 processors, a switching switch, a level translator, a serial ports control switching circuit and a panel serial ports socket; Described panel serial ports socket connects respectively described level translator, serial ports control switching circuit, and this level translator connects respectively first processor and the second processor by change-over switch; The pin of the control signal of described serial ports commutation circuit is connected with described change-over switch.

2. a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer according to claim 1, it is characterized in that: described panel serial ports socket is serial line interface DB9 socket or RJ45 socket.

3. a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer according to claim 1, it is characterized in that: described serial ports control switching circuit comprises rectifier bridge, optical coupling isolation circuit and T trigger; Described T trigger is connected with described change-over switch; Described rectifier bridge is connected with described panel serial ports socket.

4. a kind of multiplexing commutation circuit of a plurality of processor serial ports based on veneer according to claim 3 is characterized in that: the reception signal RX pin of described panel serial ports socket is connected to of described rectifier bridge and exchanges input pin.