CN106708769B - A kind of adaptive serial interface circuit - Google Patents
A kind of adaptive serial interface circuit Download PDFInfo
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- CN106708769B CN106708769B CN201510420016.2A CN201510420016A CN106708769B CN 106708769 B CN106708769 B CN 106708769B CN 201510420016 A CN201510420016 A CN 201510420016A CN 106708769 B CN106708769 B CN 106708769B
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Abstract
The present invention provides a kind of adaptive serial interface circuits, comprising: equipment serial line interface, reversed ratio-voltage conditioning circuit, micro-control unit, control output circuit and self-adaptive switch circuit；The reversed ratio-voltage conditioning circuit divides 2 feet and 3 feet of two-way connection equipment serial line interface, for will be detected from 2 feet and 3 feet it is low level be converted to high level all the way after, output is to micro-control unit；The control output circuit is input to self-adaptive switch circuit after being used for the control signal by signal condition that micro-control unit export at complementation；The self-adaptive switch circuit utilizes the receiving end of the transmitting terminal connection equipment serial line interface of the control signal execution micro-control unit received, the order of the transmitting terminal of the receiving end connection equipment serial line interface of micro-control unit.Function is determined and automatically configured using what foregoing circuit realized serial ports line sequence, avoids the problem of serial interconnection intercommunication mistake in the case where unknown device end line sequence.
Description
Technical field
The present invention relates to serial interface technologies fields, and in particular to a kind of adaptive serial interface circuit.
Background technique
Existing serial line interface is generally fixed relative to the lead-out mode at external equipment end are as follows: the output of 3 feet, the input of 2 feet, 5
Foot is GND, after equipment end is linked into host, if 3 feet of the equipment end be input, 2 feet be output when can with host into
The normal data transmission of row, conversely, then cannot achieve data-transformation facility.As shown in Figure 1, with RS232 serial ports connection host with
For peripheral hardware, if the input of equipment end, output pin are unknown, its 3 foot is output, 2 feet after CON1 is linked into external serial ports
When being input, necessarily cause external equipment that can not carry out data transmission with host.
Summary of the invention
It is an object of the present invention to solve existing serial line interface after connection host and equipment, due to cannot achieve
The function of data sending terminal and receiving end Auto-matching, thus lead to not to carry out data transmission in the case where pin wrong
Technical problem, the present invention provide a kind of adaptive serial interface circuit, can be realized equipment transmitting terminal and host using the circuit
The Auto-matching of receiving end, equipment receiving end and host sending end.
To achieve the above object, a kind of adaptive serial interface circuit provided by the invention, comprising: equipment serial line interface,
Reversed ratio-voltage conditioning circuit, micro-control unit, control output circuit and self-adaptive switch circuit；The reversed ratio electricity
Pressure conditioning circuit divides 2 feet and 3 feet of two-way connection equipment serial line interface, for that will detect low level one from 2 feet and 3 feet
After road is converted to high level, output to micro-control unit；The micro-control unit detects the transmitting terminal season control that 2 feet are equipment
End MCUCTRL_OUT processed exports logical zero signal, if 3 feet of detection are the transmitting terminal season control terminal MCUCTRL_OUT of equipment
Export logical one signal；The signal condition that the control output circuit is used to export micro-control unit is believed at complementary control
Self-adaptive switch circuit is input to after number；The self-adaptive switch circuit executes microcontroller list using the control signal received
The receiving end of transmitting terminal connection equipment serial line interface, the receiving end of micro-control unit of member connect the transmitting terminal of equipment serial line interface
Order.
It as a further improvement of the above technical scheme, further include level shifting circuit, the level shifting circuit is used
In being Transistor-Transistor Logic level the RS232 level conversion of micro-control unit port.
As a further improvement of the above technical scheme, the control output circuit is using two input terminals, four NAND gate
Circuit structure, by the signal condition of micro-control unit output at complementary control signal.
A kind of the advantages of adaptive serial interface circuit of the invention, is:
Adaptive serial interface circuit of the invention passes through the level of 2 feet of detection device serial line interface and 3 feet respectively, with
It determines the output pin and input pin of equipment end, then drives self-adaptive switch that the receiving end of host is connected with the transmitting terminal of equipment
To together, the transmitting terminal of host is connected together with the receiving end of equipment, to realize the determination of serial ports line sequence and automatic
Configuration feature avoids the problem of serial interconnection intercommunication mistake in the case where unknown device end line sequence；Therefore, it greatly facilitates
Serial ports applies the use of personnel, is omitted the work of serial ports line sequence inspection.
Detailed description of the invention
Fig. 1 is conventional RS232 serial interface communication circuit figure.
Fig. 2 is a kind of adaptive serial interface communication circuit figure of the invention.
Fig. 3 is the circuit topology figure for automatically configuring circuit in self-adaptive switch circuit of the invention and completing interconnection.
Specific embodiment
Adaptive serial interface circuit of the present invention is described in detail with reference to the accompanying drawings and examples.
A kind of adaptive serial interface circuit of the invention include: equipment serial line interface, reversed ratio-voltage conditioning circuit,
Micro-control unit, control output circuit and self-adaptive switch circuit.The reversed ratio-voltage conditioning circuit divides two-way to connect
2 feet and 3 feet of equipment serial line interface, for will be detected from 2 feet and 3 feet it is low level be converted to high level all the way after, it is defeated
Out to micro-control unit；The micro-control unit exports control terminal MCUCTRL_OUT when detecting the transmitting terminal that 2 feet are equipment
Logical zero signal, if the transmitting terminal season control terminal MCUCTRL_OUT that 3 feet of detection are equipment exports logical one signal.Institute
Stating the effect of control output circuit is that the signal condition that micro-control unit exports is adaptive at being input to after complementary control signal
Inductive switch circuit；The control signal of MCU is directly to be exported by I/O port, and conditioning is due to adaptively opening at complementary control signal
Powered-down road functionally requires double switch mutual exclusion.The self-adaptive switch circuit is executed micro- using the control signal received
It is serial that the transmitting terminal of control unit is connected to the receiving end of equipment serial line interface, the receiving end of micro-control unit is connected to equipment
The order of the transmitting terminal of interface.
Above-mentioned micro-control unit (MCU) refers to the microcontroller for embedding the board of this circuit, that is to say, that a band micro-control
The board of device processed does not have serial port function, now by the self adaptive control function of this microcontroller implementation serial ports after addition serial port function
Energy.
Adaptive serial interface circuit based on above structure, the circuit further include level shifting circuit, the level
It is Transistor-Transistor Logic level that the effect of conversion circuit, which is the RS232 level conversion of the port MCU,.RS232 level is provided by external serial ports
, since MCU can not directly detect negative voltage signal, while absolute value of voltage is more than MCU tolerance range, so being turned by level
To meet MCU after changing.Transistor-Transistor Logic level signal is widely used, and is because usual data indicate to provide using binary system ,+5V is equivalent to
Logical one, 0V are equivalent to logical zero, this is referred to as TTL (transistor-transistor logic level) signal system, this is computer
The standard technique communicated between each section inside the equipment of processor control.
In definition of the RS-323C standard to logic level, for data (information code): the level of logical one (mark)
Lower than -3V, the level of logical zero (spacing) is higher than+3V；For controlling signal: on-state (ON) the i.e. effective level of signal
Higher than+3V, off-state (OFF) the i.e. level of invalidating signal is lower than -3V, that is, when the absolute value of transmission level is greater than 3V
When, circuit, which can be checked effectively, to be come, and the voltage between -3~+3V is meaningless, lower than -15V or higher than the electricity of+15V
Pressure also thinks meaningless, therefore, in actual work, should ensure that level between ± (3~15) V.
In addition, the circuit structure of two input terminals, four NAND gate can be used in the control output circuit, by micro-control unit
The signal condition of output is at complementary control signal.
As shown in Fig. 2, utilizing above-mentioned adaptive serial interface of the invention by taking RS232 serial ports connection host and peripheral hardware as an example
Mouth circuit realizes the Auto-matching of equipment transmitting terminal and the receiving end MCU, equipment receiving end and MCU transmitting terminal, specific to work
Principle are as follows: after equipment serial line interface CON1 is linked into external equipment serial ports, be each responsible for by reversed ratio-voltage conditioning circuit
Detect CON1 2,3 feet -12V level, and detect -12V be converted into+5V all the way after be linked into MCU, at this time such as
Fruit is that have -12V level on 2 feet, illustrates that 2 feet (MCUDET1-IN) are to send foot, if instead being to have -12V level on 3 feet, then
Determine that 3 feet (MCUDET2-IN) are to send foot.When MCU detects that MCUDET1-IN is high level, MCU makes MCUCTRL_OUT
Output be 0V level, simultaneously because control output circuit in two input terminals, four NAND gate U3 reversely make N_MCUCTRL output be
5V level configures equipment serial line interface after self-adaptive switch circuit is using the control signal that control output circuit is sent is received
It is disconnected for 1 foot, 2 feet, 3 feet, the conducting of 4 feet, 8 feet, 9 feet disconnect, 10 feet, the conducting of 11 feet.Conversely, when MCU detects MCUDET2-
When IN is high level, MCU makes MCUCTRL_OUT output be 5V level, simultaneously because U3 reversely makes N_MCUCTRL output be 0V electricity
Flat, after self-adaptive switch circuit is using the control signal that control output circuit is sent is received, configuration equipment serial line interface is 1
Foot, the conducting of 2 feet, 3 feet, 4 feet disconnect, and 8 feet, the conducting of 9 feet, 10 feet, 11 feet disconnect.So far the configuration of interconnecting of RS232 level
It completes, completes the conversion of RS232 level and Transistor-Transistor Logic level, by level shifting circuit finally to realize interconnecting for serial ports.
In addition, automatically configuring the circuit structure that circuit completes interconnection in self-adaptive switch circuit, may be designed as showing in Fig. 3
Circuit topology figure.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (3)
1. a kind of adaptive serial interface circuit, including equipment serial line interface, which is characterized in that further include: reversed ratio-voltage
Conditioning circuit, micro-control unit, control output circuit and self-adaptive switch circuit；The reversed ratio-voltage conditioning circuit is total
Two-way connects 2 feet and 3 feet of equipment serial line interface, low level is converted to high electricity all the way for that will detect from 2 feet and 3 feet
After flat, output to micro-control unit；The micro-control unit detects the transmitting terminal season control terminal MCUCTRL_ that 2 feet are equipment
OUT exports logical zero signal, if the transmitting terminal season control terminal MCUCTRL_OUT that 3 feet of detection are equipment exports logical one
Signal；The control output circuit is used for signal condition that micro-control unit export at being input to oneself after complementary control signal
Adapt to switching circuit；The self-adaptive switch circuit is connected using the transmitting terminal that the control signal received executes micro-control unit
The receiving end of the receiving end, micro-control unit that connect equipment serial line interface connects the order of the transmitting terminal of equipment serial line interface.
2. adaptive serial interface circuit according to claim 1, which is characterized in that it further include level shifting circuit, institute
The level shifting circuit stated is used to the RS232 level conversion of micro-control unit port be Transistor-Transistor Logic level.
3. adaptive serial interface circuit according to claim 1, which is characterized in that the control output circuit uses
The circuit structure of two input terminals, four NAND gate, by the signal condition of micro-control unit output at complementary control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510420016.2A CN106708769B (en) | 2015-07-16 | 2015-07-16 | A kind of adaptive serial interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510420016.2A CN106708769B (en) | 2015-07-16 | 2015-07-16 | A kind of adaptive serial interface circuit |
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| CN106708769A CN106708769A (en) | 2017-05-24 |
| CN106708769B true CN106708769B (en) | 2019-08-06 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109359078A (en) * | 2018-12-10 | 2019-02-19 | 威创集团股份有限公司 | A kind of self-adapting serial port interface circuit and its control method for middle control host |
| CN109800203A (en) * | 2019-01-25 | 2019-05-24 | 山东超越数控电子股份有限公司 | A kind of RS232 serial ports RXD and TXD automatic switch-over circuit and its switching method |
| CN109871347A (en) * | 2019-02-28 | 2019-06-11 | 山东超越数控电子股份有限公司 | RS232 serial ports intersection, direct-connected line automatic switching module, system and method |
| CN110727613A (en) * | 2019-09-20 | 2020-01-24 | 深圳市信锐网科技术有限公司 | Conversion device |
| CN112988642A (en) * | 2019-12-16 | 2021-06-18 | 浙江宇视科技有限公司 | Reverse connection preventing method for serial port signals and switch switching circuit |
| CN112925684A (en) * | 2021-03-22 | 2021-06-08 | 西安紫光国芯半导体有限公司 | Testing method of link establishment logic and related equipment |
| CN114490454B (en) * | 2021-12-29 | 2023-07-18 | 广州河东科技有限公司 | Method and device for self-adaptive driving of equipment serial port and serial port equipment |
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| CN203027245U (en) * | 2012-11-09 | 2013-06-26 | 深圳市祈飞科技有限公司 | RS232 and RS485 adaptive interface circuit |
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| US7975094B2 (en) * | 2004-04-15 | 2011-07-05 | Marvell International Technology Ltd. | Programmable I/O interface |
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| CN1342938A (en) * | 2000-09-11 | 2002-04-03 | 合肥创源智能网络有限责任公司 | Plug-and-play method for measuring-controlling module in RS-485 bus type measuring-controlling system and its measuring-controlling module |
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| CN106708769A (en) | 2017-05-24 |
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