CN1389800A - Transmission direction change-over device and method - Google Patents
Transmission direction change-over device and method Download PDFInfo
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- CN1389800A CN1389800A CN 01115741 CN01115741A CN1389800A CN 1389800 A CN1389800 A CN 1389800A CN 01115741 CN01115741 CN 01115741 CN 01115741 A CN01115741 A CN 01115741A CN 1389800 A CN1389800 A CN 1389800A
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Abstract
The invented device and method for switching the transmission direction can be utilized in the half-duplex communication set. The invented device comprises at least the data transmission detector and the executor of the direction-switching rule. The data transmission detector coupled to the transmission line is used to detect whether there are data to be output. The executor receives the data. When the signal of the data is zero or low, the executor sends the dirction-switching signal through direction control line to the interface driven in the half-duplex communication set, setting the transmission direction as the transmitting direction, otherwise setting the transmission direction as the receiving direction.
Description
The invention relates to the apparatus and method of switching transmission direction, particularly relevant for a kind of device that need not consider data formats and transmission speed.
Recent years, the development of PC is to advance by leaps and bounds, its popularity rate increases with surprising rapidity year by year, comply with the tendency of the day of this PC, interconnective use situation is more and more between various electronic installations and the PC, these are connected electronic installation with PC, it may be another PC, or some electronic devices, in order to reach the connection between PC and the electronic installation satisfactorily, must adopt standardized interface (interface), for example (RS-485).
Being connected of computer and its peripheral device (importing out device) also takes place in the situation of the employing of this kind standardization interface.Around computer, with the data input computer, or acceptance is from the data of computer, be called peripheral device (I/O device abbreviates I/O as), these peripheral devices comprise keyboard, printer, display etc., use cable (cable) to connect between peripheral device and the computer, except considering the compatibility of physical construction that also must consider the consistance of the data transmission parameter of computer and peripheral device, the latter is general alleged communications protocol.
Communications protocol comprises transfer rate (baud rate), data bit number (data bit), coordination (parity), stop the bit number, transmission data number, half-duplex/full duplex mode etc., existing RS-485 transmits with half-duplex mode, and, when transmission speed changes to some extent, then must adjust the setting of transmission speed, a kind of traditional RS-485 technology, as described below, consult shown in Figure 1, show in the prior art among the figure, the calcspar of the data transmission direction of half-duplex operation interface, it is a direction of utilizing transmission direction switching device shifter control transmission, be respectively general asynchronous transceiver (Universal Asynchronous Receiver Transmitter with bus-bar 100 couples, UART) 130, transmission direction switching device shifter 200, decoding circuit, 130 of wherein general asynchronous transceivers further are connected with half-duplex operation interface driver 140.
And transmission direction switching device shifter 200 controls signal to half-duplex operation interface driver 140 through 210 outputs one of direction control line, to change the transmission direction of its data.When bus-bar 100 received data, its data was to transmit via conveyer line 190, and in general, its data transmission direction all is preset as the direction of reception.If bus-bar 100 desires send out a data via conveyer line 190, the direction of the general reception of being scheduled to is opposite, at this moment, just can't finish the action of transmission data, therefore, when desire transfers out data, just carry out the work that direction is switched by outbound course switching device shifter 200, send a direction control signal to half-duplex operation interface driver 140 via a direction control line 210, make half-duplex operation interface driver 140 change the direction of its data transmission.
Before bus-bar 100 desires spread out of a data, must do the setting of transfer rate and data formats (data format) earlier to affiliated general asynchronous transceiver 130, so meeting is sent to general asynchronous transceiver 130 with the information of a form and speed earlier.In this simultaneously, transmission direction switching device shifter 200 is detected the information of this form and speed to come out in bus-bar 100, and according to this form data and rate information, calculate the transmission basis time of corresponding output data, this transmission basis time is transmission direction holding time after switching, and meaning is promptly exported the time that data outwards transmits, when the basis time to the time, the data end of transmission, and simultaneously the outbound course of data is reverted to receive direction.
Transmission direction switching device shifter 200 is connected with conveyer line 190, in order to detect the initial bit of output data, when detecting initial bit, just send a direction control signal to half-duplex operation interface driver 140 via direction control line 210, data transmission direction with half-duplex operation interface driver 140 at once switches to direction of transfer, this is the transmission start time of basis time, and data just begins to transmit outward via conveyer line 190.By the time the transmission basis time is when arriving, data also transmits and finishes, transmission direction switching device shifter 200 is sent a direction control signal to half-duplex operation interface driver 140 again via direction control line 210, and the transmission direction of half-duplex operation interface driver 140 then reverts to receive direction.
Consult shown in Figure 2ly, it is in the conventional art, the thin portion calcspar of transmission direction switching device shifter 200.Wherein instant blocking apparatus 201 links to each other with bus-bar 100, is transmitted the form of data and the information of speed with interception, and exports a transmission basic data.But this transmission basic data is received by a procedure basis time generator that links to each other with instant blocking apparatus 201 202, and the transmission basis time that produces is to the transmission direction self-actuated controller 204 that links to each other with basic time generator 202.
But transmission direction self-actuated controller 204 receives the transmission basis time from procedure basis time generator 202 on the one hand, receives the direction switching signal from initial bit Auto-Sensing device 203 on the other hand.Initial bit Auto-Sensing device 203 links to each other with conveyer line 190, when initial bit Auto-Sensing device 203 detects initial bit by conveyer line 190, promptly exports a direction switching signal one transmission direction self-actuated controller 204.When transmission direction self-actuated controller 204 receives the direction switching signal, the direction that receives is switched to the direction of transmission via direction control line 210, its time of keeping is by the time decision of transmission basis, when the transmission basis time to the time, data also transmits and finishes, and via direction control line 210 transmission direction of data is reverted to the direction of reception again.
From the above mentioned, existing transmission direction switching device shifter 200 must detect the information of form and speed from bus-bar 100, and from conveyer line 190 detecting start characters, with the usefulness as the control transmission direction.And, when transmission speed changes to some extent, also must adjust the decision of transmission speed, make the design of transmission direction switching device shifter 200 become very complicated, the present invention is promptly at this shortcoming, one simply design is proposed, yet, can reach the method and apparatus of controlling with the direction of preceding case identical function.
One of purpose of the present invention is a kind of transmission direction switching device shifter that need not capture the form of data transmission of development.
Another object of the present invention is a kind of transmission direction switching device shifter that need not capture the transfer rate of data transmission of development.
Another object of the present invention provides a kind of transmission direction switching device shifter that need not set transmission speed.
Transmission direction switching device shifter of the present invention comprises a data transmission detector and a direction switching principle actuator, data transmission detector links to each other with conveyer line, and direction switching principle actuator links to each other with data transmission detector on the one hand, in order to receive signal, also link to each other with interface in the half-duplex operation interface driver via the direction control line from data transmission detector.
Data transmission detector links to each other with conveyer line, in order to detecting whether data output is arranged, if, then the information of output is further delivered to direction switching principle actuator, make direction switching principle actuator begin to switch the direction of half-duplex operation interface driver.The principle of its switching is: if be 0 or during low signal from the signal of the output data of data transmission detector, then direction switching principle actuator is via the direction control line, send a direction switching signal to half-duplex operation interface driver, by original default receive direction, change its transmission direction the direction of transmission into; When from the signal of the data transmission of data transmission detector by 0 or low signal, become 1 or during high signal, then direction switching principle actuator is via the direction control line, send a direction switching signal to half-duplex operation interface driver, its transmission direction by direction of transfer, is reverted to the direction of reception.
Description of drawings:
Fig. 1 is the calcspar of the data transmission direction of prior art half-duplex operation interface, shows the situation of utilizing transmission direction switching device shifter control transmission direction among the figure;
Fig. 2 is in the prior art, the thin portion calcspar of transmission direction switching device shifter;
Fig. 3 is the calcspar of the data transmission direction of half-duplex operation interface of the present invention, and it is a direction of utilizing transmission direction switching device shifter control transmission;
Fig. 4 is the thin portion calcspar of transmission direction switching device shifter of the present invention and half-duplex operation interface driver;
Fig. 5 is the synoptic diagram that Fig. 4 signal A-D changes.
The invention provides a kind of method and device of switching of control transmission direction, it is a function of utilizing original signal subtraction in the half-duplex operation interface driver, and transmission direction switching device shifter of the present invention is realized, the method that control of the present invention is switched, can be without the detecting information form, and when transmission speed changes to some extent, also can reset transfer rate.
Consult shown in Figure 3, it is the transmission direction that utilizes transmission direction switching device shifter 600 control half-duplex operation interface drivers 540, be respectively general asynchronous transceiver 530, transmission direction switching device shifter 600 with bus-bar 500 couples, 530 of wherein general asynchronous transceivers further are connected with half-duplex operation interface driver 540.
And transmission direction switching device shifter 600 controls signal to half-duplex operation interface driver 540 through 610 outputs one of direction control line, and to change the transmission direction of its data, when bus-bar 500 received data, its data received via receiving line 570; When bus-bar 500 transmitted data, its data was to transmit via conveyer line 590, and in general, its data transmission direction all is preset as the direction of reception.If bus-bar 500 desires send out a data via conveyer line 590, to preset the direction that receives opposite with general, at this moment, just can't finish the action of transmission data, therefore, when desire transfers out data, just carry out the work that direction is switched by outbound course switching device shifter 600, send a direction control signal to half-duplex operation interface driver 540 via a direction control line 610, make half-duplex operation interface driver 540 change the direction of its data transmission.
Transmission direction switching device shifter 600 joins with conveyer line 590, in order to detect whether data output is arranged, if, just comply with a specific principle via direction control line 610, send a direction control signal to half-duplex operation interface driver 540, in time switching is done in the transmission direction of half-duplex operation interface driver 540.Switching principle of the present invention is for being 0 or during low signal, then transmission direction is set at transmission when the signal of transmission data; When the signal of data transmission is 1 or during high signal, then set transmission direction for receiving.Its more detailed embodiment will be described as follows:
Consult shown in Figure 4, it is the thin portion calcspar of transmission direction switching device shifter 600 with half-duplex operation interface driver 540, but transmission direction switching device shifter 600 is to be made by program logic device, comprising a data transmission detector 601 and a direction switching principle actuator 602.Data transmission detector 601 links to each other with conveyer line 590, and direction switching principle actuator 602 links to each other with data transmission detector 601 on the one hand, in order to receive signal from data transmission detector 601, on the other hand, link to each other with interface 541 in the half-duplex operation interface driver 540 via direction control line 610.
Data transmission detector 601 links to each other with conveyer line 590, in order to detecting whether data output is arranged, if, then the information of output is further delivered to direction switching principle actuator 602, make direction switching principle actuator 602 begin to switch the direction of half-duplex operation interface driver 540.The principle of its switching is: if be 1 or during low signal from the signal of the output data of data transmission detector 601, then direction switching principle actuator 602 is via direction control line 610, send a direction switching signal to half-duplex operation interface driver 540, by original default receive direction, change its transmission direction the direction of transmission into; When from the signal of the data transmission of data transmission detector 601 by 0 or low signal, become 1 or during high signal, then direction switching principle actuator 602 is via direction control line 610, send a direction switching signal to half-duplex operation interface driver 540, its transmission direction by direction of transfer, is reverted to the direction of reception.
Comprise an interface 541, reverse generator 542 and signal subtraction processor 543 in the half-duplex operation interface driver 540.Interface 541 receives the direction switching signal from the data transmission of conveyer line 590 and direction control line 610 simultaneously, when the signal from the output data of conveyer line 590 is 0 or low signal the time, send a direction switching signal to interface 541 from direction control line 610, the transmission direction that makes interface is a direction of transfer, therefore, 0 or low signal then deliver to signal subtraction processor 543 and reverse generator 542 via interface 541.
When the signal from the output data of conveyer line 590 is 1 or high signal the time, send a direction switching signal to interface 541 from direction control line 610, the transmission direction that makes interface is a receive direction, at this moment, signal on the conveyer line 590 is a high impedance status, and this high impedance signal is delivered to signal subtraction processor 543 and reverse generator 542 respectively via interface 541.See also shown in Figure 5ly, if the data on the conveyer line 590 is A, then the signal sent of interface 541 then is B.
Consult shown in Figure 4ly, oppositely generator 542 links to each other with interface 541, receives the information from interface 541, and oppositely generator 542 is that the data of importing is done an opposite action, makes the signal of output present opposite state with the signal of input.Consult shown in Figure 5ly, for example, information B becomes information C after via reverse generator 542.
Consult shown in Figure 4, signal subtraction processor 543 links to each other with reverse generator 542 with interface 541 respectively, and signal subtraction processor 543 will deduct the signal of self-reversal generator 542 from the signal of interface 541, with obtain with original conveyer line 590 on identical signal, and export this signal.Consult shown in Figure 5ly, signal subtraction processor 543 is with signal B subtraction signal C, and output signal D, and wherein, signal D is identical with signal on the original conveyer line 590.
The above only is preferred embodiment of the present invention, and any correction of being done with spirit of the present invention all belongs to scope of the present invention.For example, direction switching principle actuator 602 can transmit signal A on the detector 601 according to data, produces a signal opposite with A earlier, and promptly negative A is again according to being 0 or during low signal, then transmission direction is set at reception when the signal of bearing A; When the signal of negative A is 1 or during high signal, then set the principle that transmission direction transmits, carry out follow-up step.
In sum, transmission direction switching device shifter 600 of the present invention must not detect the information of form and speed from bus-bar 500, and must be from conveyer line 590 detecting start characters, with the usefulness as the control transmission direction.In addition, when transmission speed changes to some extent, also must not adjust the setting of transmission speed, make the design of transmission direction switching device shifter 600 become very simple.And the execution of signal subtraction only is an existing function of utilizing existing half-duplex operation interface driver, must not do design more.Therefore, the present invention has following characteristics: 1, the form of data transmission and speed can not considered.2, the transmission speed of Adjustment System at any time not.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention.
Claims (12)
1, a kind of transmission direction switching device shifter, be applied in the half-duplex operation device, it is characterized in that this half-duplex operation device comprise general asynchronous transceiver, with half-duplex operation interface driver, this half-duplex operation interface driver has the function of signal subtraction, and link to each other via the general asynchronous transceiver of a conveyer line and this, this transmission direction switching device shifter then links to each other with half-duplex operation interface driver via a direction control line, and this transmission direction switching device shifter comprises at least:
Data transmission detector, this data transmission detector and this conveyer line couple, and in order to detecting whether data output are arranged, if then this data transmission is gone out; And
Direction switching principle actuator, this direction switching principle actuator receives this data, when the signal of this data is 0 or during low signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of transmission; When the signal from the data transmission of data transmission detector is 1 or during high signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of reception.
2, transmission direction switching device shifter as claimed in claim 1 is characterized in that: half-duplex operation interface driver is one to meet the driver of RS485 standard.
3, transmission direction switching device shifter as claimed in claim 1 is characterized in that: but be to make by program logic device.
4, a kind of transmission direction switching device shifter, be applied in the half-duplex operation device, it is characterized in that this half-duplex operation device comprise general asynchronous transceiver, with half-duplex operation interface driver, this half-duplex operation interface driver has the function of signal subtraction, and link to each other via the general asynchronous transceiver of a conveyer line and this, this transmission direction switching device shifter then links to each other with half-duplex operation interface driver via a direction control line, and this transmission direction switching device shifter comprises at least:
Data transmission detector, this data transmission detector and this conveyer line couple, and in order to detecting whether data output are arranged, if then this data transmission is gone out; And
Direction switching principle actuator, this direction switching principle actuator receives this data, and produce a negative data opposite with this data, when the signal of this negative data is 0 or during low signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of reception; When this negative data is 1 or during high signal, then this direction switching principle actuator is sent a direction switching signal to this half-duplex operation interface driver via this direction control line, its transmission direction is set at the direction of transmission.
5, transmission direction switching device shifter as claimed in claim 4 is characterized in that: half-duplex operation interface driver is one to meet the driver of RS485 standard.
6, transmission direction switching device shifter as claimed in claim 4 is characterized in that: but make by program logic device.
7, a kind of method of transmission direction switching direction, be applied in the half-duplex operation device, it is characterized in that this half-duplex operation device comprises general asynchronous transceiver, half-duplex operation interface driver, the transmission direction switching device shifter, this half-duplex operation interface driver has the function of signal subtraction, and non-ly link to each other with transceiver via a conveyer line and this are general, this transmission direction switching device shifter then links to each other with half-duplex operation interface driver via a direction control line, and this transmission direction switching device shifter comprises data transmission detector and direction switching principle actuator, and the method for this switching transmission direction comprises at least:
The transmission of detecting information, it is to utilize the data transmission detector that couples with this conveyer line, whether detecting has data output, if then this data transmission is gone out; And
Carry out the switching of transmission direction, it is to utilize this direction switching principle actuator to finish, this direction switching principle actuator receives this data, when the signal of this data is 0 or during low signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of transmission; When the signal from the data transmission of data transmission detector is 1 or during high signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of reception.
8, the method for transmission direction switching direction as claimed in claim 7 is characterized in that: half-duplex operation interface driver is one to meet the driver of RS485 standard.
9, the method for transmission direction switching direction as claimed in claim 7 is characterized in that: but the transmission direction switching device shifter is to be made by program logic device.
10, a kind of method of transmission direction switching direction, be applied in the half-duplex operation device, it is characterized in that this half-duplex operation device comprises general asynchronous transceiver, half-duplex operation interface driver, the transmission direction switching device shifter, this half-duplex operation interface driver has the function of signal subtraction, and link to each other via the general asynchronous transceiver of a conveyer line and this, this transmission direction switching device shifter then links to each other with half-duplex operation interface driver via a direction control line, and this transmission direction switching device shifter comprises data transmission detector and direction switching principle actuator, and the method for this switching transmission direction comprises at least:
The transmission of detecting information, it is to utilize the data transmission detector that couples with this conveyer line, whether detecting has data output, if then this data transmission is gone out; And
Carry out the switching of transmission direction, it is to utilize this direction switching principle actuator to finish, this direction switching principle actuator receives this data, when the signal of this data is 0 or during low signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of reception, when the signal from the data transmission of data transmission detector is 1 or during high signal, then this direction switching principle actuator is via this direction control line, send a direction switching signal to this half-duplex operation interface driver, its transmission direction is set at the direction of reception.
11, the method for transmission direction switching direction as claimed in claim 10 is characterized in that: the logical moving device of half-duplex operation interface is one to meet the driver of RS485 standard.
12, the method for transmission direction switching direction as claimed in claim 10 is characterized in that: but the transmission direction switching device shifter is to be made by program logic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011157410A CN1160896C (en) | 2001-06-04 | 2001-06-04 | Transmission direction change-over device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011157410A CN1160896C (en) | 2001-06-04 | 2001-06-04 | Transmission direction change-over device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1389800A true CN1389800A (en) | 2003-01-08 |
| CN1160896C CN1160896C (en) | 2004-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011157410A Expired - Fee Related CN1160896C (en) | 2001-06-04 | 2001-06-04 | Transmission direction change-over device and method |
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| Country | Link |
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| CN (1) | CN1160896C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358278C (en) * | 2004-03-09 | 2007-12-26 | 精工爱普生株式会社 | Data transfer control device, electronic instrument, and data transfer control method |
| CN101556566B (en) * | 2008-04-10 | 2012-05-30 | 联咏科技股份有限公司 | Electronic device and method for detecting bidirectional bus competition |
| CN104598411A (en) * | 2014-09-02 | 2015-05-06 | 奇点新源国际技术开发(北京)有限公司 | State switching method and device for IO port of receiving and sending device |
| CN106031077A (en) * | 2014-02-19 | 2016-10-12 | 德州仪器公司 | Control of TX/RX mode in serial half-duplex transceiver separately from communicating host |
| CN108984445A (en) * | 2017-06-05 | 2018-12-11 | 扬智科技股份有限公司 | Chip and data transmission method are transmitted using the data of JESD204B digital interface |
-
2001
- 2001-06-04 CN CNB011157410A patent/CN1160896C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358278C (en) * | 2004-03-09 | 2007-12-26 | 精工爱普生株式会社 | Data transfer control device, electronic instrument, and data transfer control method |
| US7706309B2 (en) | 2004-03-09 | 2010-04-27 | Seiko Epson Corporation | Data transfer control device, electronic instrument, and data transfer control method |
| CN101556566B (en) * | 2008-04-10 | 2012-05-30 | 联咏科技股份有限公司 | Electronic device and method for detecting bidirectional bus competition |
| CN106031077A (en) * | 2014-02-19 | 2016-10-12 | 德州仪器公司 | Control of TX/RX mode in serial half-duplex transceiver separately from communicating host |
| EP3108607A4 (en) * | 2014-02-19 | 2017-08-23 | Texas Instruments Incorporated | Control of tx/rx mode in serial half-duplex transceiver separately from communicating host |
| US9892080B2 (en) | 2014-02-19 | 2018-02-13 | Texas Instruments Incorporated | Receive mode upon expiration of UART transmit start BIT delay |
| CN106031077B (en) * | 2014-02-19 | 2019-11-12 | 德州仪器公司 | The method for avoiding unnecessarily switching TX/RX selection signal between frames |
| CN104598411A (en) * | 2014-09-02 | 2015-05-06 | 奇点新源国际技术开发(北京)有限公司 | State switching method and device for IO port of receiving and sending device |
| CN104598411B (en) * | 2014-09-02 | 2018-01-23 | 奇点新源国际技术开发(北京)有限公司 | A kind of state switching method and device of transceiver I/O port |
| CN108984445A (en) * | 2017-06-05 | 2018-12-11 | 扬智科技股份有限公司 | Chip and data transmission method are transmitted using the data of JESD204B digital interface |
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|---|---|
| CN1160896C (en) | 2004-08-04 |
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