CN101140557A - System and method of RS232/RS48 compatibility interface - Google Patents
System and method of RS232/RS48 compatibility interface Download PDFInfo
- Publication number
- CN101140557A CN101140557A CNA200710176238XA CN200710176238A CN101140557A CN 101140557 A CN101140557 A CN 101140557A CN A200710176238X A CNA200710176238X A CN A200710176238XA CN 200710176238 A CN200710176238 A CN 200710176238A CN 101140557 A CN101140557 A CN 101140557A
- Authority
- CN
- China
- Prior art keywords
- interface
- signal
- level
- transistor
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Logic Circuits (AREA)
Abstract
The invention discloses a system as well as a relevant method to fulfill RS232 and RS485 interface compatibility; wherein, the system comprises: An interface shift module, is used to complete shift operation between an RS232 interface and an RS485 interface; a level converting module connected with the interface shift module, is used to fulfill conversion between RS232 interface level signals and RS232 interface TTL level signals, as well as between RS485 interface level signals and RS485 interface TTL level signals; and an interface control and signal process module connected with the interface shift module and the level conversion module, is used to control the interface shift module to complete shift operation between the RS232 interface and the RS485 interface, and process the RS232 interface TTL level signals and the RS485 interface TTL level signals. Compared with prior arts, the invention has advantages of simple hardware, low manual intervention, flexible control, high reliability and convenient expansion for interface quantity.
Description
Technical field
The present invention relates to communication technique field, particularly relate to a kind of system and method thereof that is used for the RS232/RS485 compatibility interface of SDH transmission equipment.
Background technology
At present SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) in the transmission equipment, all some RS232 and RS485 interface are provided to the user, be used for the switching of RS232 interface signal and RS485 interface signal, because system docking mouth limited in number, generally all require the design of RS232 and RS485 interface compatibility, some defectives are all arranged in present implementation method, such as:
1) adopt jumper wire device to carry out switch and select, adopt this method control complicated, when interface attributes is changed, need select artificially, cause misconnection easily, maintainability and dirigibility are bad, and the maintainer is had relatively high expectations.
2) application number is in the Chinese patent application of " 200510038579 ", use special-purpose URAT (Universal Asynchronous Receiver/Transmitter, UART Universal Asynchronous Receiver Transmitter) controller, can realize the automatic switchover of RS232 and RS485 interface, reliability and dirigibility height, but this method need be used special chip, cost is too high, be suitable for terminal device, it can not provide the full duplex interface of RS485 interface simultaneously, in only conduct transmission switching, also inapplicable in the occasion that acquiescence connects.
Summary of the invention
Technical matters to be solved by this invention is to provide the system and the method thereof of a kind of RS232 of realization and RS485 compatibility interface, be used for being used in the interface realization compatibility that acquiescence connects RS232, RS485 half-duplex and the RS485 full duplex of occasion, and making that compatible secure is reliable, control is flexible, it is simple to safeguard, cost is low.
To achieve these goals, the invention provides the system of a kind of RS232 of realization and RS485 compatibility interface, it is characterized in that, comprising:
Interface switching module is used to finish the switching between RS232 interface and the RS485 interface;
Level switch module connects described interface switching module, is used to finish between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal; And
Interface control and signal processing module, connect described interface switching module, described level switch module, be used to control described interface switching module and finish switching between RS232 interface and the RS485 interface, and handle described RS232 interface Transistor-Transistor Logic level signal, described RS485 interface Transistor-Transistor Logic level signal.
The system of described realization RS232 and RS485 compatibility interface, wherein, described interface switching module receives the selection control signal of described interface control and signal processing module output, when described selection control signal is low level signal, selects the RS232 interface; When described selection control signal is high level signal, select the RS485 interface.
The system of described realization RS232 and RS485 compatibility interface, wherein, described level switch module comprises:
The RS232 level switch module, be used for the RS232 interface level conversion of signals of described interface switching module input is become RS232 interface Transistor-Transistor Logic level signal, be input to described interface control and signal processing module, and the RS232 interface Transistor-Transistor Logic level conversion of signals that the control of described interface and signal processing module are exported become RS232 interface level signal, output to described interface switching module; And
The RS485 level switch module, be used for the RS485 interface level conversion of signals of described interface switching module input is become RS485 interface Transistor-Transistor Logic level signal, be input to described interface control and signal processing module, and the RS485 interface Transistor-Transistor Logic level conversion of signals that the control of described interface and signal processing module are exported become RS485 interface level signal, output to described interface switching module.
The system of described realization RS232 and RS485 compatibility interface wherein, when described level switch module is operated in the RS485 interface, carries out work with the half-or full-duplex working method.
The system of described realization RS232 and RS485 compatibility interface, wherein, when described level switch module is operated in half-duplex operation, the transmission enable signal, the reception enable signal that send by described interface control and signal processing module are set to high level transmission data, and behind forward delay interval, described transmission enable signal, described reception enable signal are set to low level, to receive data.
The system of described realization RS232 and RS485 compatibility interface, wherein, transmission data bits and bit rate that described forward delay interval is set when setting the half-duplex interface attributes are determined.
The system of described realization RS232 and RS485 compatibility interface, wherein, when described level switch module is operated in full-duplex mode, the transmission enable signal, the reception enable signal that send by described interface control and signal processing module are set to high level, finish the sendaisle function in the full duplex; Described transmission enable signal, described reception enable signal are set to low level, finish the receiving cable function in the full duplex.
To achieve these goals, the present invention also provides the method for a kind of RS232 of realization and RS485 compatibility interface, it is characterized in that, comprising:
The interface switch step is finished the switching between RS232 interface and the RS485 interface;
The level conversion step is finished between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal; And
Interface control and signal Processing step are controlled between described RS232 interface and the described RS485 interface and are switched, and handle described RS232 interface Transistor-Transistor Logic level signal, described RS485 interface Transistor-Transistor Logic level signal.
The method of described realization RS232 and RS485 compatibility interface wherein, in the described interface switch step, further comprises:
According to selecting control signal to finish switch step between described RS232 interface and the described RS485 interface, specifically:
When described selection control signal is low level signal, select the RS232 interface; Or
When described selection control signal is high level signal, select the RS485 interface.
The method of described realization RS232 and RS485 compatibility interface, wherein, in the described level conversion step, further comprise: when level conversion was operated in half-duplex operation, the level that sends enable signal, reception enable signal by control was just finished the step that reiving/transmitting state switches under the half-duplex duty.
Useful technique effect of the present invention:
Compared with prior art, adopt the inventive method to simplify hardware, saved system resource, reduced manual intervention, control is flexible, reliability height, Convenient interface expansion for interface quantity greatly.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the theory diagram that the present invention realizes RS232 and RS485 compatibility interface;
Fig. 2 a, Fig. 2 b are the enforcement schematic diagrams of interface switching module of the present invention;
Fig. 3 a, Fig. 3 b, Fig. 3 c are the enforcement schematic diagrams of level switch module of the present invention;
Fig. 4 is the enforcement schematic diagram of interface control of the present invention and signal processing module;
Fig. 5 is the method flow diagram that the present invention realizes RS232 and RS485 compatibility interface.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is made further more detailed description.
As shown in Figure 1, be the theory diagram that the present invention realizes RS232 and RS485 compatibility interface, this block diagram comprises: interface switching module 10, level switch module 20, interface control and signal processing module 30.
Wherein, RS232 level switch module 201 is used to finish the conversion of RS232 interface level signal to RS232 interface Transistor-Transistor Logic level signal; RS485 level switch module 202 is used to finish RS485 interface level signal to the conversion that becomes RS485 interface Transistor-Transistor Logic level signal.
Interface control and signal processing module 30, connecting interface handover module 10, level switch module 20, be mainly used in and finish docking port handover module 10 and carry out control, RS232 interface TTL signal Processing and the RS485 interface TTL signal Processing of interface when switching, and the half-duplex operation when realizing the RS485 interface and the switching controls and the signal Processing of full-duplex mode.
Shown in Fig. 2 a, Fig. 2 b, be the enforcement schematic diagram of interface switching module of the present invention.In conjunction with Fig. 1, the enforcement principle of interface switching module 10 among this figure is carried out following description.
Provided 2 road RS232/RS485 compatible circuits among this figure,, can suitably increase corresponding circuit if increase interface quantity.
At Fig. 2 a, among Fig. 2 b, ALINE1, ALINE2, BLINE1, BLINE2 is interface signal, R232_1, R232_2, T232_1, T232_2 is the input/output signal of RS232 level switch module 201 to interface end, RS485A_1, RS485A_2, RS485B_1, RS485B_2 is the input/output signal of RS485 level switch module 202 to interface end, because the present invention is used for giving tacit consent to the occasion of connection, so the handshake of RS232 and RS485 interface protocol is not used, the function of this part is mainly by the K1 among the figure, K2 finishes, K1, K2 is a relay, it is subjected to the control signal SELECT1 of interface control and signal processing module 30 outputs, the control of SELECT2, work as SELECT1, when the SELECT2 control signal is low level signal, VT1, VT2 disconnects, VT1, VT2 is a triode, K1,2 and the 3 pin conductings of K2,6 and 7 also conductings of pin simultaneously, thus interface is chosen as the RS232 interface; As SELECT1, when the SELECT2 control signal is high level, VT1, VT2 conducting, the 3 and 4 pin conductings of K1, K2,5 and 6 also conductings of pin simultaneously, thus interface is chosen as the RS485 interface.
Shown in Fig. 3 a, Fig. 3 b, Fig. 3 c, be the enforcement schematic diagram of level switch module of the present invention.In conjunction with Fig. 1, the enforcement principle that connects level switch module 20 among this figure is carried out following description.
In Fig. 3 a, Fig. 3 b, Fig. 3 c, level switch module 20 is realized finishing between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal by D1, D2, D3 chip, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal.
D1 is ADM3202ARNZ or ICL3232ECBNZ-T chip, it is used to finish the conversion of 2 road RS232 interface level signals, D2, D3 are MAX3485EESA+T or ADM3485EARZ or LTC1480IS8#PBF chip, respectively finish one road RS485 interface level conversion of signals.
When level switch module 20 is operated in the RS485 interface, can be operated in these two kinds of working methods of half-duplex and full duplex.
When being operated in half-duplex operation, D2, D3 chip have been finished 2 road RS485 interface level conversion of signals, mainly finish the switching of the reiving/transmitting state under the half-duplex duty by control TXEN_* and RXEN*_* signal.Concrete control mode is as follows:
Under the normal condition, TXEN_* and RXEN*_* are low level, D2, D3 chip operation are in receive status, when data will send, control TXEN_* and RXEN*_* signal are high level, and this moment, D2, D3 chip operation were in transmit status, through certain forward delay interval (transmission data bits and bit rate decision that delay time defines during by definition half-duplex interface attributes), again TXEN_* and RXEN*_* are set to low level, allow D2, D3 chip rework in receive status.
When being operated in full-duplex mode, D2, D3 chip cooperate finishes 1 tunnel full duplex interface, TXEN_* that can be by control D2, D3 chip and RXEN*_* are provided with D2 chip or D3 chip flexibly and finish and send or the receiving cable function, when TXEN_* and RXEN*_* are high level simultaneously, this relevant chip and the interface corresponding with it are finished the sendaisle function in the full duplex, when TXEN_* and RXEN*_* were low level simultaneously, this relevant chip and the interface corresponding with it were finished the receiving cable function in the full duplex.
TXEN_* and RXEN*_* signal and the Transistor-Transistor Logic level signal that joins with interface control and signal processing module 30 are all produced and are handled by interface control and signal processing module 30.
Wherein, TXEN_* sends enable signal, comprises the TXEN_1 of D2 chip, the TXEN_2 of D3 chip, and RXEN*_* receives enable signal, comprises the RXEN*_1 of D2 chip, the RXEN*_2 of D3 chip.
As shown in Figure 4, be the enforcement schematic diagram of interface control of the present invention and signal processing module.In conjunction with Fig. 1, the enforcement principle of interface control and signal processing module 30 among this figure is carried out following description.
The function of interface control and signal processing module 30 is mainly finished by programmable device FPGA/CPLD, it mainly finishes control signals such as producing SELECT1, SELECT2, TXEN_1, TXEN_2, RXEN*_1 and RXEN*_2, and interface control and signal processing module 30 are finished RS232 interface Transistor-Transistor Logic level signal and RS485 interface Transistor-Transistor Logic level Signal Processing by these control signals.
As shown in Figure 5, be the method flow diagram that the present invention realizes RS232 and RS485 compatibility interface.In conjunction with Fig. 1-4, the method flow of realizing RS232 and RS485 compatibility interface is carried out following description, particularly, this flow process comprises:
Step 501 is finished the switching between RS232 interface and the RS485 interface;
In this step, finish between RS232 interface and the RS485 interface according to SELECT1, SELECT2 control signal and to switch:
As SELECT1, when the SELECT2 control signal is low level signal, select the RS232 interface;
As SELECT1, when the SELECT2 control signal is high level signal, select the RS485 interface.
Step 502 is finished between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal;
In this step, when level conversion is operated in half-duplex operation, just finish reiving/transmitting state switching under the half-duplex duty by the level of control TXEN_*, RXEN*_*.
Step 503 is switched between control RS232 interface and the RS485 interface, and handles RS232 interface Transistor-Transistor Logic level signal, RS485 interface Transistor-Transistor Logic level signal.
The inventive method is applied to provide the system of RS232 and RS485 interface, and this method is safe and reliable, control is flexible, it is simple to safeguard, is a kind of method that is used in the interface of giving tacit consent to the RS232, RS485 half-duplex and the RS485 full duplex compatibility that connect occasion.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. a system that realizes RS232 and RS485 compatibility interface is characterized in that, comprising:
Interface switching module is used to finish the switching between RS232 interface and the RS485 interface;
Level switch module connects described interface switching module, is used to finish between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal; And
Interface control and signal processing module, connect described interface switching module, described level switch module, be used to control described interface switching module and finish switching between RS232 interface and the RS485 interface, and handle described RS232 interface Transistor-Transistor Logic level signal, described RS485 interface Transistor-Transistor Logic level signal.
2. the system of realization RS232 according to claim 1 and RS485 compatibility interface, it is characterized in that, described interface switching module receives the selection control signal of described interface control and signal processing module output, when described selection control signal is low level signal, selects the RS232 interface; When described selection control signal is high level signal, select the RS485 interface.
3. the system of realization RS232 according to claim 1 and RS485 compatibility interface is characterized in that described level switch module comprises:
The RS232 level switch module, be used for the RS232 interface level conversion of signals of described interface switching module input is become RS232 interface Transistor-Transistor Logic level signal, be input to described interface control and signal processing module, and the RS232 interface Transistor-Transistor Logic level conversion of signals that the control of described interface and signal processing module are exported become RS232 interface level signal, output to described interface switching module; And
The RS485 level switch module, be used for the RS485 interface level conversion of signals of described interface switching module input is become RS485 interface Transistor-Transistor Logic level signal, be input to described interface control and signal processing module, and the RS485 interface Transistor-Transistor Logic level conversion of signals that the control of described interface and signal processing module are exported become RS485 interface level signal, output to described interface switching module.
4. according to the system of claim 1,2 or 3 described realization RS232 and RS485 compatibility interface, it is characterized in that, when described level switch module is operated in the RS485 interface, carry out work with the half-or full-duplex working method.
5. the system of realization RS232 according to claim 4 and RS485 compatibility interface, it is characterized in that, when described level switch module is operated in half-duplex operation, the transmission enable signal, the reception enable signal that send by described interface control and signal processing module are set to high level transmission data, and behind forward delay interval, described transmission enable signal, described reception enable signal are set to low level, to receive data.
6. the system of realization according to claim 5 RS232 and RS485 compatibility interface is characterized in that, transmission data bits and bit rate that described forward delay interval is set when setting the half-duplex interface attributes are determined.
7. the system of realization RS232 according to claim 5 and RS485 compatibility interface, it is characterized in that, when described level switch module is operated in full-duplex mode, the transmission enable signal, the reception enable signal that send by described interface control and signal processing module are set to high level, finish the sendaisle function in the full duplex; Described transmission enable signal, described reception enable signal are set to low level, finish the receiving cable function in the full duplex.
8. a method that realizes RS232 and RS485 compatibility interface is characterized in that, comprising:
The interface switch step is finished the switching between RS232 interface and the RS485 interface;
The level conversion step is finished between RS232 interface level signal and the RS232 interface Transistor-Transistor Logic level signal, and the conversion between RS485 interface level signal and the RS485 interface Transistor-Transistor Logic level signal; And
Interface control and signal Processing step are controlled between described RS232 interface and the described RS485 interface and are switched, and handle described RS232 interface Transistor-Transistor Logic level signal, described RS485 interface Transistor-Transistor Logic level signal.
9. the method for realization RS232 according to claim 8 and RS485 compatibility interface is characterized in that, in the described interface switch step, further comprises:
According to selecting control signal to finish switch step between described RS232 interface and the described RS485 interface, specifically:
When described selection control signal is low level signal, select the RS232 interface; Or
When described selection control signal is high level signal, select the RS485 interface.
10. according to Claim 8 or the methods of 9 described realization RS232 and RS485 compatibility interface, it is characterized in that, in the described level conversion step, further comprise: when level conversion was operated in half-duplex operation, the level that sends enable signal, reception enable signal by control was just finished the step that reiving/transmitting state switches under the half-duplex duty.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710176238XA CN100561457C (en) | 2007-10-23 | 2007-10-23 | A kind of system of RS232/RS485 compatibility interface and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710176238XA CN100561457C (en) | 2007-10-23 | 2007-10-23 | A kind of system of RS232/RS485 compatibility interface and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101140557A true CN101140557A (en) | 2008-03-12 |
| CN100561457C CN100561457C (en) | 2009-11-18 |
Family
ID=39192512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710176238XA Expired - Fee Related CN100561457C (en) | 2007-10-23 | 2007-10-23 | A kind of system of RS232/RS485 compatibility interface and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100561457C (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098055A (en) * | 2010-12-28 | 2011-06-15 | 上海磁浮交通发展有限公司 | Data baud rate adaptive digital-analogue conversion device |
| CN102110067A (en) * | 2009-12-29 | 2011-06-29 | 深圳市金博联电力技术有限公司 | Highly reliable RS232/RS485/RS422 mixing module for electric power FTU |
| CN101662369B (en) * | 2008-08-28 | 2012-02-08 | 中冶赛迪工程技术股份有限公司 | Universal network adapter |
| CN101609313B (en) * | 2009-07-16 | 2012-10-10 | 北京亚博瑞思科技开发有限责任公司 | Control circuit for switching communication interface in operating device of automatic parking equipment and method therefor |
| CN102868424A (en) * | 2012-09-27 | 2013-01-09 | 广东易事特电源股份有限公司 | Automatic transceiving control RS 485 communication circuit |
| CN103257610A (en) * | 2012-02-16 | 2013-08-21 | 西门子公司 | Programmable logic controller (PLC) switching device and PLC thereof |
| CN103944707A (en) * | 2014-05-12 | 2014-07-23 | 哈尔滨工业大学 | Full-duplex and half-duplex converter and conversion method |
| CN104238569A (en) * | 2014-07-25 | 2014-12-24 | 山东中鸿新能源科技有限公司 | Console control module for cloud terminal |
| CN104298212A (en) * | 2014-10-31 | 2015-01-21 | 上海斐讯数据通信技术有限公司 | RS232 and RS485 compatible system |
| CN105487948A (en) * | 2015-11-24 | 2016-04-13 | 上海斐讯数据通信技术有限公司 | RS232 port test apparatus and test method |
| CN106383800A (en) * | 2016-08-29 | 2017-02-08 | 深圳市共济科技股份有限公司 | Intelligent serial interface equipment switching device and method |
| WO2017173889A1 (en) * | 2016-04-08 | 2017-10-12 | 中兴通讯股份有限公司 | Communication interface hardware self-adaptive multiplexing device and method |
| CN108182166A (en) * | 2018-01-25 | 2018-06-19 | 深圳市朗仁科技有限公司 | Serial ports channel selection circuit and with its vehicular data acquisition box |
| CN112865984A (en) * | 2020-12-31 | 2021-05-28 | 深圳市共济科技股份有限公司 | Communication interface switching circuit and switching method thereof |
| CN113688079A (en) * | 2021-08-12 | 2021-11-23 | 江苏嘉擎信息技术有限公司 | Multi-level switching circuit for realizing communication current control |
| CN114785869A (en) * | 2022-06-20 | 2022-07-22 | 陕西中测智能科技有限公司 | RS 232-to-one-wire protocol module and conversion method |
-
2007
- 2007-10-23 CN CNB200710176238XA patent/CN100561457C/en not_active Expired - Fee Related
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662369B (en) * | 2008-08-28 | 2012-02-08 | 中冶赛迪工程技术股份有限公司 | Universal network adapter |
| CN101609313B (en) * | 2009-07-16 | 2012-10-10 | 北京亚博瑞思科技开发有限责任公司 | Control circuit for switching communication interface in operating device of automatic parking equipment and method therefor |
| CN102110067A (en) * | 2009-12-29 | 2011-06-29 | 深圳市金博联电力技术有限公司 | Highly reliable RS232/RS485/RS422 mixing module for electric power FTU |
| CN102098055A (en) * | 2010-12-28 | 2011-06-15 | 上海磁浮交通发展有限公司 | Data baud rate adaptive digital-analogue conversion device |
| CN102098055B (en) * | 2010-12-28 | 2014-05-21 | 上海磁浮交通发展有限公司 | Data baud rate adaptive digital-analogue conversion device |
| CN103257610B (en) * | 2012-02-16 | 2016-03-09 | 西门子公司 | The switching device shifter of PLC and PLC thereof |
| CN103257610A (en) * | 2012-02-16 | 2013-08-21 | 西门子公司 | Programmable logic controller (PLC) switching device and PLC thereof |
| CN102868424B (en) * | 2012-09-27 | 2015-03-18 | 广东易事特电源股份有限公司 | Automatic transceiving control RS 485 communication circuit |
| CN102868424A (en) * | 2012-09-27 | 2013-01-09 | 广东易事特电源股份有限公司 | Automatic transceiving control RS 485 communication circuit |
| CN103944707B (en) * | 2014-05-12 | 2017-06-06 | 哈尔滨工业大学 | Full duplex and half-duplex converter and conversion method |
| CN103944707A (en) * | 2014-05-12 | 2014-07-23 | 哈尔滨工业大学 | Full-duplex and half-duplex converter and conversion method |
| CN104238569B (en) * | 2014-07-25 | 2017-02-15 | 山东中鸿新能源科技有限公司 | Console control module for cloud terminal |
| CN104238569A (en) * | 2014-07-25 | 2014-12-24 | 山东中鸿新能源科技有限公司 | Console control module for cloud terminal |
| CN104298212A (en) * | 2014-10-31 | 2015-01-21 | 上海斐讯数据通信技术有限公司 | RS232 and RS485 compatible system |
| CN105487948A (en) * | 2015-11-24 | 2016-04-13 | 上海斐讯数据通信技术有限公司 | RS232 port test apparatus and test method |
| WO2017173889A1 (en) * | 2016-04-08 | 2017-10-12 | 中兴通讯股份有限公司 | Communication interface hardware self-adaptive multiplexing device and method |
| CN107273320A (en) * | 2016-04-08 | 2017-10-20 | 中兴通讯股份有限公司 | A kind of adaptive multiplexer of communication interface hardware and method |
| CN106383800A (en) * | 2016-08-29 | 2017-02-08 | 深圳市共济科技股份有限公司 | Intelligent serial interface equipment switching device and method |
| CN108182166A (en) * | 2018-01-25 | 2018-06-19 | 深圳市朗仁科技有限公司 | Serial ports channel selection circuit and with its vehicular data acquisition box |
| CN112865984A (en) * | 2020-12-31 | 2021-05-28 | 深圳市共济科技股份有限公司 | Communication interface switching circuit and switching method thereof |
| CN113688079A (en) * | 2021-08-12 | 2021-11-23 | 江苏嘉擎信息技术有限公司 | Multi-level switching circuit for realizing communication current control |
| CN113688079B (en) * | 2021-08-12 | 2024-05-14 | 江苏嘉擎信息技术有限公司 | Multi-level switching circuit for realizing communication flow control |
| CN114785869A (en) * | 2022-06-20 | 2022-07-22 | 陕西中测智能科技有限公司 | RS 232-to-one-wire protocol module and conversion method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100561457C (en) | 2009-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100561457C (en) | A kind of system of RS232/RS485 compatibility interface and method thereof | |
| CN205081869U (en) | A matrix switched systems for having more form video signal switches | |
| CN105208298A (en) | Matrix switching system and matrix switching method for switching among multi-format video signals | |
| CN109951653B (en) | CAN instruction switching multi-path multi-format photoelectric video signal output system and method | |
| CN111881072B (en) | High-speed USB TYPE-C interface device supporting bidirectional transmission and graphic signal generator | |
| JP2005501441A (en) | Inverse multiplexing method | |
| CN101752760A (en) | Multiplex USB cable connector | |
| CN1333560C (en) | High-performance optical fibre CAN communication system for strong electromagnetism interference environment | |
| CN201638145U (en) | RS232/RS485 (Recommend Standard 232/Recommend Standard 485) integrated interface circuit | |
| CN101141216A (en) | Data transmission method and data transmission channel device in wavelength-division system | |
| CN101166041B (en) | Radio-frequency far end distributed system in radio communication system | |
| CN101968777A (en) | Computer signalling system, keyboard-image-mouse extension system and data transmission method | |
| CN103268301A (en) | Automatic-flowing half-duplex UART interface circuit | |
| CN203057158U (en) | 485 communication circuit and communication system | |
| CN112506839B (en) | One-to-many SPI bus switching method and device | |
| CN205091733U (en) | Communication interface conversion device | |
| CN101420250B (en) | Switching device | |
| CN210491048U (en) | HDMI extender powered by POE | |
| CN209913823U (en) | Data conversion device and photoelectric conversion network system | |
| CN102904789B (en) | RS485 isolates communicating circuit and control method thereof | |
| CN104020532A (en) | Serial communication optical fiber conversion device with universal serial bus (USB) interface | |
| CN109246366A (en) | A kind of LVDS interface switch and its switching method | |
| CN216772411U (en) | 4-channel RS485 expansion board based on anti-surge technology | |
| CN203537475U (en) | Relay serial port camera | |
| CN112214438B (en) | Data transmission device, method, network equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20161023 |