CN106649177A - Device for automatic identification and switching of port of universal serial interface and working method thereof - Google Patents
Device for automatic identification and switching of port of universal serial interface and working method thereof Download PDFInfo
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- CN106649177A CN106649177A CN201611247223.3A CN201611247223A CN106649177A CN 106649177 A CN106649177 A CN 106649177A CN 201611247223 A CN201611247223 A CN 201611247223A CN 106649177 A CN106649177 A CN 106649177A
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- shifting circuits
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Communication Control (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a device for automatic identification and switching of a port of a universal serial interface and a working method thereof. The device comprises an automatic identification control unit, a first-level analog switch unit, an RS485 level switching circuit, an RS232 level switching circuit, a second-level analog switch unit and a universal interface unit, wherein the automatic identification control unit is provided with a serial interface and a control terminal; the first-level analog switch unit is connected to the RS485 level switching circuit, the RS232 level switching circuit and the serial interface; and the serial interface is connected with the RS485 level switching circuit or the RS232 level switching circuit under control of the control terminal. The device and the working method thereof have the advantages that the complexity of onsite construction and maintenance can be greatly reduced and the investment costs of equipment and human power are greatly reduced.
Description
Technical field
The invention belongs to electronic technology field, and in particular to a kind of port automatic identification switching device of universal serial port and its
Method of work.
Background technology
At present, industry or communication monitoring field smart device communication interface mainly have two kinds of specifications of RS485 and RS232.It is past
Past is the interface type that institute's access device is just known to job site, and is all single RS485 or RS232 with its corollary equipment
Connecting interface, causes the mismatch of live access interface.Conventional settling mode is to change access device or increase one-level RS485
RS 232, RS232 turn RS485 modular converters, but the shortcoming of this 2 kinds of settling modes is delay project duration, increase construction and tie up
Shield difficulty, in addition it is also necessary to extra input large number quipments and human cost.
The content of the invention
The purpose of the present invention is according to above-mentioned the deficiencies in the prior art part, there is provided known automatically a kind of port of universal serial port
Other switching device and its method of work, the device using analog switch and level shifting circuit by realizing universal serial port
Automatic detection and switching.
The object of the invention is realized being completed by technical scheme below：
A kind of port automatic identification switching device of universal serial port, it is characterised in that：Including automatic identification control unit, the first order
Analog switch unit, RS485 level shifting circuits, RS232 level shifting circuits, second level analog switch unit and general connect
Mouth unit；The automatic identification control unit is provided with serial line interface and control end；The first order analog switch unit connects
The RS485 level shifting circuits, RS232 level shifting circuits and the serial line interface are connect, and in the control of the control end
The serial line interface is connected with the RS485 level shifting circuits or the RS232 level shifting circuits under system；Described second
Level analog switch unit connects the RS485 level shifting circuits, the RS232 level shifting circuits and the general-purpose interface
Unit, and by the Versatile Interface Unit and the RS485 level shifting circuits or described under the control of the control end
RS232 level shifting circuits connect.
Light-coupled isolation module is provided between the serial line interface and the first order analog switch unit；The control end
The first order analog switch unit and the second level analog switch unit are provided with light-coupled isolation module.
The RS485 level shifting circuits include Transistor-Transistor Logic level interface and RS485 electric level interfaces；The RS485 level turns
Circuit is changed for the signal of the signal of the Transistor-Transistor Logic level interface and the RS485 electric level interfaces mutually to be changed；It is described
Transistor-Transistor Logic level interface connects the first order analog switch unit, and the RS485 electric level interfaces connect the second level analog switch
Unit.
The RS232 level shifting circuits include Transistor-Transistor Logic level interface and RS232 electric level interfaces；The RS232 level turns
Circuit is changed for the signal of the signal of the Transistor-Transistor Logic level interface and the RS232 electric level interfaces mutually to be changed；It is described
Transistor-Transistor Logic level interface connects the first order analog switch unit, and the RS232 electric level interfaces connect the second level analog switch
Unit.
The RS232 level shifting circuits and the RS485 level shifting circuits are respectively connected with insulating power supply.
A kind of method of work of the port automatic identification switching device for being related to arbitrary above-mentioned universal serial port, it is characterised in that bag
Include following steps：The automatic identification control unit is detected by way of poll and is connected to setting on the Versatile Interface Unit
Standby type；The automatic identification control unit persistently gates RS232 level conversions and leads to according to testing result by the control end
Road or RS485 level conversion passages.
The RS485 level conversions passage includes the first order analog switch unit, the RS485 level shifting circuits
And the second level analog switch unit；When the RS485 level conversions passage is strobed, the RS485 level conversions
Circuit connects the serial line interface by the first order analog switch unit and the second level analog switch unit respectively
And the Versatile Interface Unit；The RS232 level conversions passage includes the first order analog switch unit, described
RS232 level shifting circuits and the second level analog switch unit；When the RS232 level conversions passage is strobed,
The RS232 level shifting circuits are respectively by the first order analog switch unit and the second level analog switch unit
Connect the serial line interface and the Versatile Interface Unit.
The device type that detection is connected on the Versatile Interface Unit specifically includes following steps：The automatic identification control
Unit processed gates the RS485 level conversions passage by control end, and by the RS485 level conversions passage be connected to
Equipment on the Versatile Interface Unit carries out trial communication；When the communication is successful, the equipment on the Versatile Interface Unit is
RS485 equipment；When communication failure is attempted, the automatic identification control unit gates the RS232 level and turns by control end
Passage is changed, and is tasted again by the RS232 level conversions passage and the equipment being connected on the Versatile Interface Unit
Ping letter；When the communication is successful, the equipment on the Versatile Interface Unit is RS232 equipment, described in when communication failure is attempted
Again detection is connected to the device type on the Versatile Interface Unit after the automatic identification control unit interval scheduled time.
It is an advantage of the invention that using unified external interface hardware circuit design and with reference to automatic identification switching control journey
The method of sequence can efficient stable the automatic identification switching for realizing RS485 and RS232 interface equipments and equipment access, processing method
Simply, it is possible to be greatly reduced site operation and the complexity safeguarded, and be significantly reduced the input of equipment and manpower into
This, is adapted to be used in industry or communication monitoring techniques field large-scale promotion.
Description of the drawings
Fig. 1 is the structured flowchart of the port automatic identification switching device of universal serial port of the present invention；
Fig. 2 is the circuit of the automatic identification control unit, light-coupled isolation module and first order analog switch unit in the present invention
Figure；
Fig. 3 is RS485 level shifting circuits in the present invention, RS232 level shifting circuits and second level analog switch unit
Circuit diagram；
Fig. 4 is the circuit diagram of the Versatile Interface Unit in the present invention；
Fig. 5 is the circuit diagram of the insulating power supply in the present invention.
Specific embodiment
Below in conjunction with accompanying drawing the feature and other correlated characteristics of the present invention are described in further detail by embodiment, with
It is easy to the understanding of technical staff of the same trade：
Such as Fig. 1-5,1-10 is marked to be respectively in figure：Automatic identification control unit 1, first order analog switch unit 2, RS485 are electric
Flat change-over circuit 3, RS232 level shifting circuits 4, second level analog switch unit 5, Versatile Interface Unit 6, light-coupled isolation module
7th, insulating power supply 8, RS232 independent current sources module 9, RS485 independent current sources module 10.
Embodiment：As shown in figure 1, the present embodiment is specifically related to a kind of port automatic identification switching device of universal serial port,
It includes automatic identification control unit 1, first order analog switch unit 2, RS485 level shifting circuits 3, RS232 level conversions
Circuit 4, second level analog switch unit 5 and Versatile Interface Unit 6.
As shown in Figure 1, 2, automatic identification control unit 1 is provided with serial line interface Uart1 and control end ComSel；Automatically
The selection of identification control unit 1 includes but is not limited to single-chip microcomputer, PLC or peripheral hardware control chip；Serial line interface Uart1 includes sending
Two holding wires of holding wire Uart1_Tx and sending signal line Uart1_Rx, serial line interface Uart1 pass through light-coupled isolation mould
The connection first order of block 7 analog switch unit 2；Control end ComSel connects first order analog switch list by light-coupled isolation module 7
Unit 2 and second level analog switch unit 5, automatic identification control unit 1 can control first order simulation by control end ComSel
The turn-on action of switch element 2 and second level analog switch unit 5.
As shown in Figure 1, 2, the connection RS485 of first order analog switch unit 2 level shifting circuits 3, RS232 level conversions electricity
Road 4 and the serial line interface Uart1 of automatic identification control unit 1；First order analog switch unit 2 can be in automatic identification control
Under the control of control end ComSel of unit 1, serial line interface Uart1 and RS485 level shifting circuits 3 or RS232 level are turned
Change circuit 4 to link together；Specifically, the COM1 pins and COM2 pins of first order analog switch unit 2 passes through respectively light
Coupling isolation module 7 connects the sending signal line Uart1_Tx and sending signal line Uart1_Rx of serial line interface Uart1；Work as control
When the signal of end ComSel is high level, RS485 level shifting circuits 3 are connected to serial interface by first order analog switch unit 2
Mouth Uart1；When the signal of ComSel is low level, first order analog switch unit 2 connects RS232 level shifting circuits 4
To serial line interface Uart1.
As shown in figure 1, the signal of the serial line interface Uart1 of automatic identification control unit 1 is changed through light-coupled isolation module 7
It is afterwards Transistor-Transistor Logic level, it is incompatible with RS485 level and RS232 level, it is therefore desirable to respectively using RS485 level shifting circuits
And RS232 level shifting circuits carry out the level conversion of signal.
As shown in Figure 1,3, RS485 level shifting circuits 3 include Transistor-Transistor Logic level interface and RS485 electric level interfaces；RS485
Level shifting circuit 3 includes receiving terminal Com1Rx_485 and transmitting terminal Com1Tx_485；RS485 level shifting circuits 3 connect
Receiving end Com1Rx_485 and transmitting terminal Com1Tx_485 connect respectively the Com1Rx_485 pins of first order analog switch unit 2
And Com1Tx_485 pins；The RS485 electric level interfaces of RS485 level shifting circuits 3 are connected to second level analog switch unit 5
S1A pins and S2A pins；RS485 level shifting circuits 3 are used to connect the signal of Transistor-Transistor Logic level interface and RS485 level
The signal of mouth is mutually changed.
As shown in Figure 1, 2, 3, RS232 level shifting circuits 4 include Transistor-Transistor Logic level interface and RS232 electric level interfaces；
RS232 level shifting circuits 4 include receiving terminal Com1Rx_TTL and transmitting terminal Com1Tx_TTL；RS232 level shifting circuits 4
Receiving terminal Com1Rx_TTL and transmitting terminal Com1Tx_TTL connect the Com1Rx_TTL of first order analog switch unit 2 respectively
Pin and Com1Tx_TTL pins；The RS232 electric level interfaces of RS232 level shifting circuits 4 are connected to second level analog switch
The S1B pins and S2B pins of unit 5；RS232 level shifting circuits 4 are used for the signal and RS232 of Transistor-Transistor Logic level interface
The signal of electric level interface is mutually changed.
As shown in Figure 1, 2, 3, the connection of second level analog switch unit 5 RS485 level shifting circuits 3, RS232 level conversions
Circuit 4 and Versatile Interface Unit 6；Second level analog switch unit 5 can be in the control end of automatic identification control unit 1
Under the control of ComSel, Versatile Interface Unit 6 is connected to RS485 level shifting circuits 3 or RS232 level shifting circuits 4
Together；Specifically, the S1A pins of second level analog switch unit 5 and S2A pins connect RS485 level shifting circuits 3
RS485 electric level interfaces；The S1B pins of second level analog switch unit 5 and S2B pins connect RS232 level shifting circuits 4
RS232 electric level interfaces；When the signal of control end ComSel is high level, second level analog switch unit 5 turns RS485 level
Change circuit 3 and be connected to Versatile Interface Unit 6；When the signal of ComSel is low level, second level analog switch unit 5 will
RS232 level shifting circuits 4 are connected to Versatile Interface Unit 6.
First order analog switch unit 2 and second level analog switch unit 5 play a part of to connect signal or cut-off signal.
Analog switch has the advantages that fast low in energy consumption, speed, mechanical contact, small volume and long service life；In addition analog switch is also
The positive negative level of bus can be kept constant, i.e., bus signal voltages can keep completely the same before and after analog switch.
As shown in Fig. 1,4, Versatile Interface Unit 6 is used to connect external equipment；The ARX1 pins of Versatile Interface Unit 6 and
BTX1 is connected to the D1 pins and D2 pins of second level analog switch unit 5.
As shown in Figure 1,5, RS232 level shifting circuits 4 and RS485 level shifting circuits 3 are supplied by insulating power supply 8
Electricity；In the present embodiment, insulating power supply 8 includes RS232 independent current sources module 9 and RS485 independent current sources module 10, RS232
The voltage of the exportable positive and negative 15V of independent current source module 9.
As shown in Fig. 1 to 5, the present embodiment also includes a kind of work side of the port automatic identification switching device of universal serial port
Method, the method is comprised the following steps：
1）Automatic identification control unit 1 detects the device type being connected on Versatile Interface Unit 6 by way of poll；When outer
When portion's equipment is connected to Versatile Interface Unit 6, in order to be adapted to RS232 interfaces and RS485 agreements, automatic identification control unit 1
Need to detect the interface type that external equipment is adopted；In detection process, automatic identification control unit 1 gates successively RS485 level
ALT-CH alternate channel and RS232 level conversion passages, while carrying out trial communication by above-mentioned ALT-CH alternate channel.
RS485 level conversions passage includes first order analog switch unit 2, RS485 level shifting circuits 3 and the second level
Analog switch unit 5；When RS485 level conversion passages are strobed, RS485 level shifting circuits 3 pass through respectively first order mould
Intend switch element 2 and the connection serial line interface Uart1 of second level analog switch unit 5 and Versatile Interface Unit 6；Communicating
Cheng Zhong, the signal between serial line interface Uart1 and Versatile Interface Unit 6 enters line level and turns by RS485 level shifting circuits 3
Change.
RS232 level conversions passage includes first order analog switch unit 2, RS232 level shifting circuits 4 and the second level
Analog switch unit 5；When RS232 level conversion passages are strobed, RS232 level shifting circuits 4 pass through respectively first order mould
Intend switch element 2 and the connection serial line interface Uart1 of second level analog switch unit 5 and Versatile Interface Unit 6；Communicating
Cheng Zhong, the signal between serial line interface Uart1 and Versatile Interface Unit 6 enters line level and turns by RS232 level shifting circuits 4
Change.
The interface type that detection external equipment is adopted specifically includes following steps：Automatic identification control unit 1 is by control
End ComSel gating RS485 level conversion passages, and by RS485 level conversions passage be connected on Versatile Interface Unit 6
Equipment carry out trial communication；When the communication is successful, it is possible to determine that the equipment on Versatile Interface Unit 6 is RS485 equipment；When tasting
During examination communication failure, automatic identification control unit 1 gates RS232 level conversion passages by control end, and by RS232 level
ALT-CH alternate channel carries out again attempting to communicate with the equipment being connected on Versatile Interface Unit 6；When the communication is successful, it is possible to determine that even
The equipment being connected on Versatile Interface Unit 6 is RS232 equipment；If again attempting to communication failure, show to be connected to general-purpose interface
The non-RS485 and RS232 interface equipments of equipment on unit 6, or access device breaks down；When communication failure is again attempted to,
Again detection is connected to the device type on Versatile Interface Unit after the automatic identification control unit interval scheduled time.
2）When automatic identification control unit 1 is according to according to testing result, RS232 is persistently gated by control end ComSel electric
Flat ALT-CH alternate channel or RS485 level conversion passages；When the equipment being connected on Versatile Interface Unit 6 is RS232 equipment, automatically
Identification control unit 1 persistently gates RS232 level conversion passages；When the equipment being connected on Versatile Interface Unit 6 sets for RS485
When standby, automatic identification control unit 1 persistently gates RS485 level conversion passages.
The Advantageous Effects of the present embodiment are：Using unified external interface hardware circuit design and combine automatic identification
The method of switching control program can efficient stable realize RS485 and RS232 interface equipments automatic identification switching and equipment connect
Enter, processing method is simple, it is possible to site operation and the complexity safeguarded is greatly reduced, and is significantly reduced equipment and people
The input cost of power, is adapted to be used in industry or communication monitoring techniques field large-scale promotion.
Claims (8)
1. the port automatic identification switching device of a kind of universal serial port, it is characterised in that：Including automatic identification control unit, first
Level analog switch unit, RS485 level shifting circuits, RS232 level shifting circuits, second level analog switch unit and general
Interface unit；The automatic identification control unit is provided with serial line interface and control end；The first order analog switch unit
Connect the RS485 level shifting circuits, RS232 level shifting circuits and the serial line interface, and in the control end
The serial line interface is connected with the RS485 level shifting circuits or the RS232 level shifting circuits under control；Described
Two grades of analog switch units connect the RS485 level shifting circuits, the RS232 level shifting circuits and described general connect
Mouth unit, and by the Versatile Interface Unit and the RS485 level shifting circuits or described under the control of the control end
RS232 level shifting circuits connect.
2. the port automatic identification switching device of a kind of universal serial port according to claim 1, it is characterised in that：The string
Light-coupled isolation module is provided between line interface and the first order analog switch unit；The control end and the first order mould
Intend switch element and the second level analog switch unit is provided with light-coupled isolation module.
3. the port automatic identification switching device of a kind of universal serial port according to claim 1, it is characterised in that：It is described
RS485 level shifting circuits include Transistor-Transistor Logic level interface and RS485 electric level interfaces；The RS485 level shifting circuits are used for will
The signal of the signal of the Transistor-Transistor Logic level interface and the RS485 electric level interfaces is mutually changed；The Transistor-Transistor Logic level interface
Connect the first order analog switch unit, the RS485 electric level interfaces connect the second level analog switch unit.
4. the port automatic identification switching device of a kind of universal serial port according to claim 1, it is characterised in that：It is described
RS232 level shifting circuits include Transistor-Transistor Logic level interface and RS232 electric level interfaces；The RS232 level shifting circuits are used for will
The signal of the signal of the Transistor-Transistor Logic level interface and the RS232 electric level interfaces is mutually changed；The Transistor-Transistor Logic level interface
Connect the first order analog switch unit, the RS232 electric level interfaces connect the second level analog switch unit.
5. the port automatic identification switching device of a kind of universal serial port according to claim 1, it is characterised in that：It is described
RS232 level shifting circuits and the RS485 level shifting circuits are respectively connected with insulating power supply.
6. a kind of work side for being related to the port automatic identification switching device of arbitrary described universal serial port in claim 1-5
Method, it is characterised in that comprise the following steps：The automatic identification control unit is detected by way of poll and is connected to described leading to
With the device type on interface unit；The automatic identification control unit is persistently selected according to testing result by the control end
Logical RS232 level conversions passage or RS485 level conversion passages.
7. the method for work of the port automatic identification switching device of a kind of universal serial port according to claim 6, its feature
It is：The RS485 level conversions passage include the first order analog switch unit, the RS485 level shifting circuits with
And the second level analog switch unit；When the RS485 level conversions passage is strobed, the RS485 level conversions electricity
Road respectively by the first order analog switch unit and the second level analog switch unit connect the serial line interface with
And the Versatile Interface Unit；The RS232 level conversions passage includes the first order analog switch unit, the RS232
Level shifting circuit and the second level analog switch unit；It is described when the RS232 level conversions passage is strobed
RS232 level shifting circuits are connected respectively by the first order analog switch unit and the second level analog switch unit
The serial line interface and the Versatile Interface Unit.
8. the method for work of the port automatic identification switching device of a kind of universal serial port according to claim 7, its feature
It is that the device type that detection is connected on the Versatile Interface Unit specifically includes following steps：The automatic identification control is single
Unit gates the RS485 level conversions passage by control end, and by the RS485 level conversions passage be connected to it is described
Equipment on Versatile Interface Unit carries out trial communication；When the communication is successful, the equipment on the Versatile Interface Unit is RS485
Equipment；When communication failure is attempted, the automatic identification control unit gates the RS232 level conversions and leads to by control end
Road, and carry out again attempting to lead to by the RS232 level conversions passage and the equipment being connected on the Versatile Interface Unit
Letter；When the communication is successful, the equipment on the Versatile Interface Unit is RS232 equipment, described automatic when communication failure is attempted
Again detection is connected to the device type on the Versatile Interface Unit after the identification control unit interval scheduled time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611247223.3A CN106649177B (en) | 2016-12-29 | 2016-12-29 | Automatic port identification switching device of universal serial port and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611247223.3A CN106649177B (en) | 2016-12-29 | 2016-12-29 | Automatic port identification switching device of universal serial port and working method thereof |
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| CN106649177A true CN106649177A (en) | 2017-05-10 |
| CN106649177B CN106649177B (en) | 2023-06-09 |
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| CN201611247223.3A Active CN106649177B (en) | 2016-12-29 | 2016-12-29 | Automatic port identification switching device of universal serial port and working method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107451078A (en) * | 2017-08-08 | 2017-12-08 | 深圳市三旺通信技术有限公司 | A kind of compound serial port circuit |
| CN109117400A (en) * | 2018-08-09 | 2019-01-01 | 深圳市宏电技术股份有限公司 | A kind of interface automatic switching control equipment and method |
| CN110134627A (en) * | 2019-05-15 | 2019-08-16 | 浙江中控技术股份有限公司 | IO control system |
| 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 |
| CN116126608A (en) * | 2023-01-12 | 2023-05-16 | 北京众谊越泰科技有限公司 | Test fixture system and method for multi-serial port monitoring host |
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| CN107451078A (en) * | 2017-08-08 | 2017-12-08 | 深圳市三旺通信技术有限公司 | A kind of compound serial port circuit |
| CN109117400A (en) * | 2018-08-09 | 2019-01-01 | 深圳市宏电技术股份有限公司 | A kind of interface automatic switching control equipment and method |
| CN109117400B (en) * | 2018-08-09 | 2021-01-05 | 深圳市宏电技术股份有限公司 | Automatic interface switching device and method |
| CN110134627A (en) * | 2019-05-15 | 2019-08-16 | 浙江中控技术股份有限公司 | IO control system |
| 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 |
| CN116126608A (en) * | 2023-01-12 | 2023-05-16 | 北京众谊越泰科技有限公司 | Test fixture system and method for multi-serial port monitoring host |
| CN116126608B (en) * | 2023-01-12 | 2024-01-26 | 北京众谊越泰科技有限公司 | Test fixture system and method for multi-serial port monitoring host |
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