CN106649177B - Automatic port identification switching device of universal serial port and working method thereof - Google Patents
Automatic port identification switching device of universal serial port and working method thereof Download PDFInfo
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- CN106649177B CN106649177B CN201611247223.3A CN201611247223A CN106649177B CN 106649177 B CN106649177 B CN 106649177B CN 201611247223 A CN201611247223 A CN 201611247223A CN 106649177 B CN106649177 B CN 106649177B
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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
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- 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
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- 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
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- 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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Abstract
The invention discloses an automatic port identification switching device of a general serial port and a working method thereof, wherein the device comprises an automatic identification control unit, a first-stage analog switch unit, an RS485 level conversion circuit, an RS232 level conversion circuit, a second-stage analog switch unit and a general interface unit; the automatic identification control unit is provided with a serial interface and a control end; the first-stage analog switch unit is connected with the RS485 level conversion circuit, the RS232 level conversion circuit and the serial interface, and is connected with the RS485 level conversion circuit or the RS232 level conversion circuit under the control of the control end. The invention has the advantages of greatly reducing the complexity of site construction and maintenance and greatly reducing the input cost of equipment and manpower.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to an automatic port identification switching device of a universal serial port and a working method thereof.
Background
At present, the communication interface of intelligent equipment in the industrial or communication monitoring field mainly has two specifications of RS485 and RS 232. Often, the type of the interface of the accessed equipment is not known until the construction site, but the interface is a single RS485 or RS232 connection interface with the matched equipment, so that the mismatch of the site access interface is caused. The common solution is to replace access equipment or add a conversion module from one-stage RS485 to RS232 and from RS232 to RS485, but the 2 solutions have the defects of delaying project construction period, increasing construction and maintenance difficulty and needing to add a large amount of equipment and labor cost.
Disclosure of Invention
According to the defects of the prior art, the invention provides the automatic port identification switching device of the universal serial port and the working method thereof.
The invention is realized by the following technical scheme:
the utility model provides a port automatic identification auto-change over device of general serial ports which characterized in that: the device comprises an automatic identification control unit, a first-stage analog switch unit, an RS485 level conversion circuit, an RS232 level conversion circuit, a second-stage analog switch unit and a general interface unit; the automatic identification control unit is provided with a serial interface and a control end; the first-stage analog switch unit is connected with the RS485 level conversion circuit, the RS232 level conversion circuit and the serial interface, and is used for connecting the serial interface with the RS485 level conversion circuit or the RS232 level conversion circuit under the control of the control end; the second-stage analog switch unit is connected with the RS485 level conversion circuit, the RS232 level conversion circuit and the universal interface unit, and is connected with the RS485 level conversion circuit or the RS232 level conversion circuit under the control of the control end.
An optical coupling isolation module is arranged between the serial interface and the first-stage analog switch unit; the control end, the first-stage analog switch unit and the second-stage analog switch unit are provided with an optical coupling isolation module.
The RS485 level conversion circuit comprises a TTL level interface and an RS485 level interface; the RS485 level conversion circuit is used for mutually converting the signals of the TTL level interface and the signals of the RS485 level interface; the TTL level interface is connected with the first-stage analog switch unit, and the RS485 level interface is connected with the second-stage analog switch unit.
The RS232 level conversion circuit comprises a TTL level interface and an RS232 level interface; the RS232 level conversion circuit is used for mutually converting the signals of the TTL level interface and the signals of the RS232 level interface; the TTL level interface is connected with the first-stage analog switch unit, and the RS232 level interface is connected with the second-stage analog switch unit.
And the RS232 level conversion circuit and the RS485 level conversion circuit are connected with an isolation power supply.
The working method of the automatic port identification switching device related to any one of the universal serial ports is characterized by comprising the following steps: the automatic identification control unit detects the type of the equipment connected to the universal interface unit in a polling mode; and the automatic identification control unit continuously gates the RS232 level conversion channel or the RS485 level conversion channel through the control end according to the detection result.
The RS485 level conversion channel comprises the first-stage analog switch unit, the RS485 level conversion circuit and the second-stage analog switch unit; when the RS485 level conversion channel is gated, the RS485 level conversion circuit is connected with the serial interface and the universal interface unit through the first-stage analog switch unit and the second-stage analog switch unit respectively; the RS232 level conversion channel comprises the first-stage analog switch unit, the RS232 level conversion circuit and the second-stage analog switch unit; when the RS232 level conversion channel is gated, the RS232 level conversion circuit is connected with the serial interface and the universal interface unit through the first-stage analog switch unit and the second-stage analog switch unit respectively.
The detecting the type of the device connected to the universal interface unit specifically comprises the following steps: the automatic identification control unit gates the RS485 level conversion channel through a control end and performs trial communication with equipment connected to the universal interface unit through the RS485 level conversion channel; when the communication is successful, the equipment on the universal interface unit is RS485 equipment; when the communication attempt fails, the automatic identification control unit gates the RS232 level conversion channel through a control end and performs the communication attempt again with the device connected to the universal interface unit through the RS232 level conversion channel; when the communication is successful, the device on the universal interface unit is an RS232 device, and when the communication attempt fails, the automatic identification control unit re-detects the type of the device connected to the universal interface unit after a preset time interval.
The invention has the advantages that the method adopting the unified external interface hardware circuit design and combining the automatic identification switching control program can efficiently and stably realize the automatic identification switching and the equipment access of the RS485 and RS232 interface equipment, the processing method is simple, the complexity of on-site construction and maintenance can be greatly reduced, the input cost of equipment and manpower is greatly reduced, and the invention is suitable for large-scale popularization and use in the technical field of industrial or communication monitoring.
Drawings
FIG. 1 is a block diagram of a port auto-identification switching device for a universal serial port according to the present invention;
FIG. 2 is a circuit diagram of an automatic identification control unit, an optocoupler isolation module and a first stage analog switch unit in the present invention;
FIG. 3 is a circuit diagram of an RS485 level conversion circuit, an RS232 level conversion circuit and a second-stage analog switch unit in the invention;
FIG. 4 is a circuit diagram of a universal interface unit in the present invention;
fig. 5 is a circuit diagram of an isolated power supply in the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings, to facilitate understanding by those skilled in the art:
as shown in fig. 1-5, reference numerals 1-10 are respectively: the automatic identification control unit 1, the first-stage analog switch unit 2, the RS485 level conversion circuit 3, the RS232 level conversion circuit 4, the second-stage analog switch unit 5, the universal interface unit 6, the optocoupler isolation module 7, the isolation power supply 8, the RS232 independent power supply module 9 and the RS485 independent power supply module 10.
Examples: as shown in fig. 1, the present embodiment relates to an automatic port identification switching device for a universal serial port, which includes an automatic identification control unit 1, a first-stage analog switch unit 2, an RS485 level conversion circuit 3, an RS232 level conversion circuit 4, a second-stage analog switch unit 5, and a universal interface unit 6.
As shown in fig. 1 and 2, the automatic recognition control unit 1 is provided with a serial interface Uart1 and a control terminal ComSel; the selection of the automatic identification control unit 1 includes, but is not limited to, a single chip microcomputer, a PLC or a peripheral control chip; the serial interface Uart1 comprises a transmitting signal line uart1_Tx and a transmitting signal line uart1_Rx, and two signal lines of the serial interface Uart1 are connected with the first-stage analog switch unit 2 through an optocoupler isolation module 7; the control end ComSel is connected with the first-stage analog switch unit 2 and the second-stage analog switch unit 5 through the optocoupler isolation module 7, and the automatic identification control unit 1 can control the on-state actions of the first-stage analog switch unit 2 and the second-stage analog switch unit 5 through the control end ComSel.
As shown in fig. 1 and 2, the first-stage analog switch unit 2 is connected with an RS485 level conversion circuit 3, an RS232 level conversion circuit 4 and a serial interface Uart1 of the automatic identification control unit 1; the first-stage analog switch unit 2 can connect the serial interface Uart1 with the RS485 level conversion circuit 3 or the RS232 level conversion circuit 4 under the control of the control end ComSel of the automatic identification control unit 1; specifically, the COM1 pin and the COM2 pin of the first-stage analog switch unit 2 are connected to the transmission signal line urart1_tx and the transmission signal line urart1_rx of the serial interface urart 1 through the optocoupler isolation module 7, respectively; when the signal of the control end ComSel is at a high level, the first-stage analog switch unit 2 connects the RS485 level conversion circuit 3 to the serial interface Uart1; when the signal of ComSel is low level, the first-stage analog switch unit 2 connects the RS232 level conversion circuit 4 to the serial interface Uart1.
As shown in fig. 1, the signal of the serial interface Uart1 of the automatic identification control unit 1 is converted into a TTL level by the optocoupler isolation module 7, and is not compatible with the RS485 level and the RS232 level, so that the level conversion of the signal needs to be performed by using an RS485 level conversion circuit and an RS232 level conversion circuit respectively.
As shown in fig. 1 and 3, the RS485 level conversion circuit 3 includes a TTL level interface and an RS485 level interface; the RS485 level conversion circuit 3 comprises a receiving end Com1Rx_485 and a sending end Com1Tx_485; the receiving end Com1Rx_485 and the transmitting end Com1Tx_485 of the RS485 level conversion circuit 3 are respectively connected with the Com1Rx_485 pin and the Com1Tx_485 pin of the first-stage analog switch unit 2; the RS485 level interface of the RS485 level conversion circuit 3 is connected to an S1A pin and an S2A pin of the second-stage analog switch unit 5; the RS485 level conversion circuit 3 is configured to mutually convert signals of the TTL level interface and signals of the RS485 level interface.
As shown in fig. 1, 2 and 3, the RS232 level conversion circuit 4 includes a TTL level interface and an RS232 level interface; the RS232 level converting circuit 4 includes a receiving end Com1rx_ttl and a transmitting end Com1tx_ttl; the receiving end Com1Rx_TTL and the transmitting end Com1Tx_TTL of the RS232 level conversion circuit 4 are respectively connected with the Com1Rx_TTL pin and the Com1Tx_TTL pin of the first-stage analog switch unit 2; the RS232 level interface of the RS232 level conversion circuit 4 is connected to the S1B pin and the S2B pin of the second-stage analog switch unit 5; the RS232 level conversion circuit 4 is configured to convert signals of the TTL level interface and signals of the RS232 level interface into each other.
As shown in fig. 1, 2 and 3, the second-stage analog switch unit 5 is connected with the RS485 level conversion circuit 3, the RS232 level conversion circuit 4 and the universal interface unit 6; the second-stage analog switch unit 5 can connect the universal interface unit 6 with the RS485 level conversion circuit 3 or the RS232 level conversion circuit 4 under the control of the control end ComSel of the automatic identification control unit 1; specifically, the S1A pin and the S2A pin of the second-stage analog switch unit 5 are connected with an RS485 level interface of the RS485 level conversion circuit 3; the S1B pin and the S2B pin of the second-stage analog switch unit 5 are connected with an RS232 level interface of the RS232 level conversion circuit 4; when the signal of the control end ComSel is at a high level, the second-stage analog switch unit 5 connects the RS485 level conversion circuit 3 to the universal interface unit 6; when the signal of ComSel is low level, the second-stage analog switch unit 5 connects the RS232 level conversion circuit 4 to the universal interface unit 6.
The first-stage analog switch unit 2 and the second-stage analog switch unit 5 function as an on signal or an off signal. The analog switch has the advantages of low power consumption, high speed, no mechanical contact, small volume, long service life and the like; in addition, the analog switch can also keep the positive and negative levels of the bus unchanged, namely the signal voltages of the bus before and after the analog switch can be kept completely consistent.
As shown in fig. 1 and 4, the universal interface unit 6 is used for connecting with external devices; the ARX1 pin and the BTX1 pin of the universal interface unit 6 are connected to the D1 pin and the D2 pin of the second-stage analog switch unit 5, respectively.
As shown in fig. 1 and 5, the RS232 level conversion circuit 4 and the RS485 level conversion circuit 3 are both powered by an isolated power supply 8; in this embodiment, the isolated power supply 8 includes an RS232 independent power supply module 9 and an RS485 independent power supply module 10, and the RS232 independent power supply module 9 can output a voltage of plus or minus 15V.
As shown in fig. 1 to 5, the embodiment further includes a working method of the automatic port identification switching device of the universal serial port, and the method includes the following steps:
1) The automatic identification control unit 1 detects the type of the device connected to the universal interface unit 6 by means of polling; when the external device is connected to the universal interface unit 6, in order to adapt to the RS232 interface and the RS485 protocol, the automatic identification control unit 1 needs to detect the interface type adopted by the external device; in the detection process, the automatic identification control unit 1 sequentially gates the RS485 level conversion channel and the RS232 level conversion channel, and simultaneously performs trial communication through the conversion channels.
The RS485 level conversion channel comprises a first-stage analog switch unit 2, an RS485 level conversion circuit 3 and a second-stage analog switch unit 5; when the RS485 level conversion channel is gated, the RS485 level conversion circuit 3 is connected with the serial interface Uart1 and the universal interface unit 6 through the first-stage analog switch unit 2 and the second-stage analog switch unit 5 respectively; during communication, signals between the serial interface Uart1 and the universal interface unit 6 are level-converted by the RS485 level-conversion circuit 3.
The RS232 level conversion channel comprises a first-stage analog switch unit 2, an RS232 level conversion circuit 4 and a second-stage analog switch unit 5; when the RS232 level conversion channel is gated, the RS232 level conversion circuit 4 is connected with the serial interface Uart1 and the universal interface unit 6 through the first-stage analog switch unit 2 and the second-stage analog switch unit 5 respectively; during communication, signals between the serial interface Uart1 and the universal interface unit 6 are level-converted by the RS232 level-conversion circuit 4.
The method for detecting the interface type adopted by the external equipment specifically comprises the following steps: the automatic identification control unit 1 gates an RS485 level conversion channel through a control end ComSel, and performs trial communication with equipment connected to the universal interface unit 6 through the RS485 level conversion channel; when the communication is successful, the equipment on the universal interface unit 6 can be judged to be RS485 equipment; when the attempted communication fails, the automatic recognition control unit 1 gates the RS232 level conversion channel through the control terminal, and performs the attempted communication again with the device connected to the universal interface unit 6 through the RS232 level conversion channel; when the communication is successful, it can be determined that the device connected to the universal interface unit 6 is an RS232 device; if the retry communication fails, indicating that the devices connected to the universal interface unit 6 are not RS485 and RS232 interface devices, or that the access device fails; when the retry communication fails, the automatic recognition control unit re-detects the type of the device connected to the universal interface unit after a predetermined time interval.
2) When the automatic identification control unit 1 continuously gates the RS232 level conversion channel or the RS485 level conversion channel through the control end ComSel according to the detection result; when the device connected to the universal interface unit 6 is an RS232 device, the automatic recognition control unit 1 continuously gates the RS232 level conversion channel; when the device connected to the universal interface unit 6 is an RS485 device, the automatic recognition control unit 1 continuously gates the RS485 level conversion channel.
The beneficial technical effects of this embodiment are: the method adopting the unified external interface hardware circuit design and combining the automatic identification switching control program can efficiently and stably realize the automatic identification switching and the equipment access of the RS485 and RS232 interface equipment, has simple processing method, can greatly reduce the complexity of site construction and maintenance, greatly reduces the input cost of equipment and manpower, and is suitable for large-scale popularization and use in the technical field of industrial or communication monitoring.
Claims (1)
1. A working method of a port automatic identification switching device of a universal serial port is characterized by comprising the following steps of: the port automatic identification switching device comprises an automatic identification control unit, a first-stage analog switch unit, an RS485 level conversion circuit, an RS232 level conversion circuit, a second-stage analog switch unit and a universal interface unit; the automatic identification control unit is provided with a serial interface and a control end; the first-stage analog switch unit is connected with the RS485 level conversion circuit, the RS232 level conversion circuit and the serial interface, and is used for connecting the serial interface with the RS485 level conversion circuit or the RS232 level conversion circuit under the control of the control end; the second-stage analog switch unit is connected with the RS485 level conversion circuit, the RS232 level conversion circuit and the universal interface unit, and is connected with the RS485 level conversion circuit or the RS232 level conversion circuit under the control of the control end;
an optical coupling isolation module is arranged between the serial interface and the first-stage analog switch unit; the control end, the first-stage analog switch unit and the second-stage analog switch unit are provided with an optical coupling isolation module;
the RS485 level conversion circuit comprises a TTL level interface and an RS485 level interface; the RS485 level conversion circuit is used for mutually converting the signals of the TTL level interface and the signals of the RS485 level interface; the TTL level interface is connected with the first-stage analog switch unit, and the RS485 level interface is connected with the second-stage analog switch unit;
the RS232 level conversion circuit comprises a TTL level interface and an RS232 level interface; the RS232 level conversion circuit is used for mutually converting the signals of the TTL level interface and the signals of the RS232 level interface; the TTL level interface is connected with the first-stage analog switch unit, and the RS232 level interface is connected with the second-stage analog switch unit;
the RS232 level conversion circuit and the RS485 level conversion circuit are connected with an isolation power supply;
the working method of the automatic port identification switching device comprises the following steps: the automatic identification control unit detects the type of the equipment connected to the universal interface unit in a polling mode; the automatic identification control unit continuously gates an RS232 level conversion channel or an RS485 level conversion channel through the control end according to the detection result;
the RS485 level conversion channel comprises the first-stage analog switch unit, the RS485 level conversion circuit and the second-stage analog switch unit; when the RS485 level conversion channel is gated, the RS485 level conversion circuit is connected with the serial interface and the universal interface unit through the first-stage analog switch unit and the second-stage analog switch unit respectively; the RS232 level conversion channel comprises the first-stage analog switch unit, the RS232 level conversion circuit and the second-stage analog switch unit; when the RS232 level conversion channel is gated, the RS232 level conversion circuit is connected with the serial interface and the universal interface unit through the first-stage analog switch unit and the second-stage analog switch unit respectively;
the detecting the type of the device connected to the universal interface unit specifically comprises the following steps: the automatic identification control unit gates the RS485 level conversion channel through a control end and performs trial communication with equipment connected to the universal interface unit through the RS485 level conversion channel; when the communication is successful, the equipment on the universal interface unit is RS485 equipment; when the communication attempt fails, the automatic identification control unit gates the RS232 level conversion channel through a control end and performs the communication attempt again with the device connected to the universal interface unit through the RS232 level conversion channel; when the communication is successful, the device on the universal interface unit is an RS232 device, and when the communication attempt fails, the automatic identification control unit re-detects the type of the device connected to the universal interface unit after a preset time interval.
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| 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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| 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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| 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 |
| 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 |
| CN110134627B (en) * | 2019-05-15 | 2021-09-03 | 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 |
| 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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