CN103092789A - Asynchronous device controlled by switch - Google Patents
Asynchronous device controlled by switch Download PDFInfo
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- CN103092789A CN103092789A CN2011103327327A CN201110332732A CN103092789A CN 103092789 A CN103092789 A CN 103092789A CN 2011103327327 A CN2011103327327 A CN 2011103327327A CN 201110332732 A CN201110332732 A CN 201110332732A CN 103092789 A CN103092789 A CN 103092789A
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- asynchronous
- gauge tap
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- switch
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Abstract
The invention discloses an asynchronous device controlled by a switch. The asynchronous device comprises a positioning device. The positioning device is connected with the control switch. The asynchronous device is simple in structure and operation principle, and problems that when a single UART (universal asynchronous receiver/transmitter) is directly multiplexed, signals can be received by both required communication equipment and equipment which does not need the signals, the other equipment can be finally subjected to misoperation, and the normal communication signals can be affected by the other equipment in turn are solved.
Description
Technical field
The present invention relates to a kind of asynchronous device, especially relate to a kind of asynchronous device that utilizes switch to control, belong to the communications field.
Background technology
UART is a kind of general serial data bus, is used for asynchronous communication.This bus two-way communication can realize full duplex transmission and reception.In embedded design, UART is used for communicating with PC, comprises and monitoring debugger and other device, communicates by letter as EEPROM.Asynchronous communication is a kind of communication mode that is in daily use.With respect to synchronous communication, asynchronous communication is when sending character, time slot between the character that sends can be arbitrarily, certainly, receiving end must be carried out the preparation of reception constantly (if the power supply of receiving end main frame does not all add, it is just nonsensical that transmitting terminal sends character so, because receiving end can't receive at all).Transmitting terminal can begin to send character at any time, therefore must add sign in the beginning of each character and the place of end, namely adds start bit and position of rest, in order to receiving end can correctly be got off each receive character.Asynchronous communication transfer efficiency in leisurely and carefree channel is high, and shortcoming is that equipment is complicated, channel utilization is lower (because the expense proportion of start bit and position of rest is larger), but along with the development of optical-fiber network, these have not been root problem.
Asynchronous communication can be also as sending unit with frame.Receiving end must be carried out the preparation of received frame at any time.At this moment, the stem of frame must be provided with some special bit combinations, makes receiving end can find out the beginning of a frame.This delimits also referred to as frame.Frame is delimited and is also comprised the end position of determining frame.This has two kinds of methods.A kind of is that afterbody at frame is provided with the end that certain special bit combination is come marker frames.Perhaps be provided with the field of frame length in the frame stem.It should be noted that, when the asynchronous transmission frame, be not to send again after transmitting terminal must add start bit and position of rest to each character in frame, but say, transmitting terminal can send a frame at any time, and the time interval between frame and frame can be also arbitrarily.All bits in a frame are to send continuously.Transmitting terminal need to not coordinated (not needing first to carry out bit synchronous) with receiving end before sending a frame.The main process chip of locating device only provides one group of UART communication port, and peripheral need to control the equipment of communicating by letter by UART and have a plurality of, and need to need in the course of the work separately a certain equipment to be communicated, and one group of UART communication port has caused the inconvenience of signal transmission.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of asynchronous device that utilizes switch to control is provided, this asynchronous device is simple in structure, principle of operation is easy, stopped single channel UART direct when multiplexing, except the needs communication facilities can be received signal, other not the equipment of desired signal also can receive signal, finally cause the maloperation of miscellaneous equipment, miscellaneous equipment also can occur the phenomenon that normal signal of communication impacts conversely simultaneously.
Purpose of the present invention is achieved through the following technical solutions: the asynchronous device that utilizes switch to control, comprise locating device, and described locating device is connected with gauge tap.
Described gauge tap is connected with audio frequency apparatus.
Described gauge tap is connected with computing machine.
Described gauge tap is connected with card reader device.
Be provided with signal projector one and signal receiver one on described locating device.
Be provided with signal projector two and signal receiver two on described gauge tap.
Described signal projector one is connected with signal receiver two, and described signal receiver one is connected with signal projector two.
In sum, the invention has the beneficial effects as follows: this asynchronous device is simple in structure, principle of operation is easy, stopped single channel UART direct when multiplexing, except the needs communication facilities can be received signal, other not the equipment of desired signal also can receive signal, finally cause the maloperation of miscellaneous equipment, simultaneously miscellaneous equipment also can occur the phenomenon that normal signal of communication impacts conversely.
Description of drawings
Fig. 1 is principle framework figure of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment 1:
As shown in Figure 1, the asynchronous device that utilizes switch to control comprises locating device, and described locating device is connected with gauge tap.Use in the present invention the gauge tap of a DPTT double-pole triple throw, be used for the UART multiplexed port.This gauge tap uses main process chip to control, and switches to different equipment according to communication requirement and communicates.When system closing, this gauge tap is in and the computing machine on-state all the time.
Described gauge tap is connected with audio frequency apparatus.
Described gauge tap is connected with computing machine.
Described gauge tap is connected with card reader device.When needs were communicated by letter with particular device, gauge tap switched to corresponding state and only communicates by letter separately with this equipment.
Be provided with signal projector one and signal receiver one on described locating device.
Be provided with signal projector two and signal receiver two on described gauge tap.
Described signal projector one is connected with signal receiver two, and described signal receiver one is connected with signal projector two.The signal of launching on locating device is controlled signal receiver two receptions on switch, the signal that gauge tap is sent signal receiver one reception on device that is positioned.Adopt minute other signal projector and a signal receiver, signal conflict can not occur, cause communication to be obstructed.
UART is a kind of general serial data bus, is used for asynchronous communication.
Take aforesaid way, just can realize preferably the present invention.
Claims (7)
1. the asynchronous device that utilizes switch to control, it is characterized in that: comprise locating device, described locating device is connected with gauge tap.
2. the asynchronous device that utilizes switch to control as claimed in claim 1, it is characterized in that: described gauge tap is connected with audio frequency apparatus.
3. the asynchronous device that utilizes switch to control as claimed in claim 1, it is characterized in that: described gauge tap is connected with computing machine.
4. the asynchronous device that utilizes switch to control as claimed in claim 1, it is characterized in that: described gauge tap is connected with card reader device.
5. the asynchronous device that utilizes switch to control as claimed in claim 1, is characterized in that: be provided with signal projector one and signal receiver one on described locating device.
6. the asynchronous device that utilizes switch to control as claimed in claim 5, is characterized in that: be provided with signal projector two and signal receiver two on described gauge tap.
7. the asynchronous device that utilizes switch to control as claimed in claim 6, it is characterized in that: described signal projector one is connected with signal receiver two, and described signal receiver one is connected with signal projector two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103327327A CN103092789A (en) | 2011-10-28 | 2011-10-28 | Asynchronous device controlled by switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103327327A CN103092789A (en) | 2011-10-28 | 2011-10-28 | Asynchronous device controlled by switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103092789A true CN103092789A (en) | 2013-05-08 |
Family
ID=48205381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103327327A Pending CN103092789A (en) | 2011-10-28 | 2011-10-28 | Asynchronous device controlled by switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103092789A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5696911A (en) * | 1994-04-18 | 1997-12-09 | Fredriksson; Lars-Berno | Arrangement for eliminating malfunction and/or permitting high-speed transmission in a serial bus connection, and transmitter and receiver units linked to the latter |
| CN1573723A (en) * | 2003-05-15 | 2005-02-02 | 三星电子株式会社 | Method and apparatus for communication via serial multi-port |
| CN1798028A (en) * | 2004-12-24 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Bridge circuit of universal asynchronous receiver transmitter |
| CN202306540U (en) * | 2011-10-28 | 2012-07-04 | 成都高新区尼玛电子产品外观设计工作室 | Asynchronous device controlled by using switch |
-
2011
- 2011-10-28 CN CN2011103327327A patent/CN103092789A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5696911A (en) * | 1994-04-18 | 1997-12-09 | Fredriksson; Lars-Berno | Arrangement for eliminating malfunction and/or permitting high-speed transmission in a serial bus connection, and transmitter and receiver units linked to the latter |
| CN1573723A (en) * | 2003-05-15 | 2005-02-02 | 三星电子株式会社 | Method and apparatus for communication via serial multi-port |
| CN1798028A (en) * | 2004-12-24 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Bridge circuit of universal asynchronous receiver transmitter |
| CN202306540U (en) * | 2011-10-28 | 2012-07-04 | 成都高新区尼玛电子产品外观设计工作室 | Asynchronous device controlled by using switch |
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Application publication date: 20130508 |