WO2017173889A1

WO2017173889A1 - Communication interface hardware self-adaptive multiplexing device and method

Info

Publication number: WO2017173889A1
Application number: PCT/CN2017/074081
Authority: WO
Inventors: 宋晶; 马国华
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-08
Filing date: 2017-02-20
Publication date: 2017-10-12
Also published as: CN107273320A

Abstract

A communication interface hardware self-adaptive multiplexing device and method, the device comprising: an input interface module (101) configured to receive one type of communication signal of multiple signal types inputted externally; a detection and determination module (102) configured to detect an amplitude of the communication signal, and determine, according to the detected amplitude, a first signal type corresponding to a current communication signal, so as to generate a switch control signal corresponding to the first signal type; an input switching module (103) configured to input the communication signal to a path in a multipath signal converting unit corresponding to the first signal type; a signal converting module (104) configured to perform signal conversion on the received communication signal for outputting; and a serial input module (105) configured to output a signal outputted from any path of the signal converting unit.

Description

Communication interface hardware adaptive multiplexing device and method

Technical field

The present invention relates to the field of communications, and in particular, to a communication interface hardware adaptive multiplexing device and method.

Background technique

With the continuous expansion of information interaction, serial communication technology has been widely used in various fields such as communication and industrial control. At present, RS232, RS485 and other interface standards occupy a dominant position in the use of serial communication due to its own advantages. Among them, RS485, CAN and other differential signals, compared with RS232, have the advantages of long communication distance, fast speed, strong anti-interference ability and network connectivity. Therefore, in practical applications, generally only RS232 is used for deployment or debugging. Long-term idle is a waste of resources, and communication equipment is getting closer to miniaturization, and the number of interfaces equipped is limited. Therefore, it is necessary to implement multiplexing switching of the communication interface in a way to avoid the waste of resources and realize the convenience and flexibility of the application.

In response to this problem, the main solutions currently used in the industry include: using a hybrid interface, and selecting a communication method by using a jumper or a dial switch. This method requires manual opening of the device casing for manual operation, which is neither flexible nor error-prone. . In the direct cascading mode, the receiving end is wired at the hybrid interface through a device such as a diode. In this way, the communication links affect each other, the signal quality is poor, and the data loss is severe under the condition of high baud rate. It is implemented by a dedicated processing chip such as a universal asynchronous transceiver, which is costly and also involves the problem of requiring two sets of access protection circuits. It adopts software detection, control and special circuit implementation. This method has poor portability and needs CPU resource and human development cost. The circuit is judged by a circuit such as a comparator or a composite logic circuit, and switching is performed by a relay. This method is complicated in circuit, and usually requires two sets of access circuits, which wastes cost.

Summary of the invention

The embodiment of the invention provides a communication interface hardware adaptive multiplexing device and method, which solves the problem that the existing communication interface adaptive multiplexing device requires software participation, poor portability, complicated structure and low reliability.

In one aspect, an embodiment of the present invention provides a communication interface hardware adaptive multiplexing device, the device comprising: an input interface module configured to receive a plurality of externally input signal types of communication signals through a plurality of pins thereof The detecting and determining module is configured to detect the amplitude of the communication signal, and determine the first signal type corresponding to the communication signal currently received by the input interface module according to the detected amplitude, and generate a switch corresponding to the first signal type. a control signal; the input switching module is configured to receive the switching control signal, and input the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit according to the switching control signal; the signal conversion module, the signal conversion module includes multiple signals The conversion unit, each signal conversion unit corresponds to a signal type communication signal, each signal conversion unit is configured to perform signal conversion on the received communication signal, and output; the serial input module is connected to each signal conversion unit. , configured to output a signal output from any one of the signal conversion units.

In another aspect, an embodiment of the present invention provides a communication interface hardware adaptive multiplexing method, the method comprising: receiving, from a plurality of pins of an input interface module, a communication signal of multiple signal types externally input a detecting a magnitude of the communication signal, and determining, according to the detected amplitude, a first signal type corresponding to the communication signal currently received by the input interface module, generating a switching control signal corresponding to the first signal type; and according to the switching control signal Transmitting the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit; at the signal conversion module, performing signal conversion on the input signal, and outputting to a serial input module; receiving each through the serial input module The signal output from the signal conversion unit is output.

In the embodiment of the present invention, by detecting the amplitude of the communication signal, and determining, according to the detected amplitude, the first signal type corresponding to the communication signal currently received by the input interface module, corresponding to a switching control signal of the first signal type; according to the switching control signal, the communication signal is input to a path corresponding to the first signal type in the multi-channel signal conversion unit. The hardware self-adaptive completion of the communication signal is realized, no manual operation is required, software programming is not involved, the trouble of developing related software is saved, the portability is improved, the operation error is reduced, and the same input interface module and a set of input are adopted. The protection module only occupies a pair of asynchronous serial interfaces of the CPU, completely realizes the compatibility of the two communication modes, improves the integration degree of the circuit, and saves resources.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a structural diagram of a hardware adaptive multiplexing apparatus for a communication interface according to a first embodiment of the present invention;

2 is a structural diagram of an input interface module in a hardware adaptive multiplexing apparatus for a communication interface according to a first embodiment of the present invention;

3 is a circuit diagram of an absolute value unit in a communication interface hardware adaptive multiplexing device according to a first embodiment of the present invention;

4 is a circuit diagram of a control unit in a communication interface hardware adaptive multiplexing device according to a first embodiment of the present invention;

5 is a structural diagram of an input switching module in a communication interface hardware adaptive multiplexing device according to a first embodiment of the present invention;

FIG. 6 is a flowchart of a method for adaptive multiplexing of a communication interface hardware according to a second embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention. Rather than all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

First embodiment

Referring to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 , an embodiment of the present invention provides a communication interface hardware adaptive multiplexing device, where the device includes:

The input interface module 101 is configured to receive one of a plurality of signal types of external input signals through a plurality of pins of the plurality of pins; in the embodiment, the communication signals of the plurality of signal types include the RS232 signal and the RS232. The signal has other communication signals with a level difference, and the other communication signals include at least the RS485 signal.

In this embodiment, the structure of the input interface module 101 is as shown in FIG. 2, including a first pin 1011, a second pin 1012, and a third pin 1013, wherein the RS232 signal read signal RS232-R and the RS485 signal A The terminal signal RS485-A can multiplex the first pin 1011, the RS232 signal write signal RS232-T and the RS485 signal B terminal signal RS485-B can multiplex the second pin 1012, and the third pin 1013 is used for grounding.

Moreover, in order to reduce the influence of external interference on the system circuit, the device further includes an input protection module 106 configured to perform EMC protection processing on the communication signal received by the input interface module 101, and output the processed communication signals RXD and TXD.

The detection determining module 102 is configured to detect the amplitude of the communication signal processed by the input protection module 106, and determine, according to the detected amplitude, the first signal type corresponding to the communication signal currently received by the input interface module 101, corresponding to the first A signal type switching control signal. In this embodiment, the detection determining module 102 includes an absolute value unit 1021 and a control unit 1022, wherein the absolute value unit 1021 is configured to detect the amplitude of the communication signal and obtain an absolute value of the amplitude; the control unit 1022, The first signal type corresponding to the communication signal currently received by the input interface module 101 is determined according to the absolute value of the detected amplitude, and is generated corresponding to the first signal class. Type switching control signal.

The absolute value unit 1021 is mainly processed for the negative level of the communication signal, and the absolute value of the amplitude of the communication signal is obtained after the processing. In this embodiment, the circuit of the absolute value unit 1021 is as shown in FIG. 3, and includes: a fourth resistor R4, and a pin 1 is configured to receive the communication signal RXD, the 2 pin and the fifth resistor R5 processed by the input protection module 106. Pin 1 of the 1st and 6th resistors R6 is connected to the 2nd pin of the negative input terminal of the operational amplifier U1. The positive input terminal of U1 is grounded, the positive terminal of the power supply is connected with the +15V power supply signal, and the negative terminal of the power supply is connected with the -15V power supply signal. The U1 output terminal 6 is connected to the negative terminal of the diode VD3 and the positive terminal of the VD4. The 2 pin of the fifth resistor R5 is connected to the positive terminal of VD3, the 2 pin of the seventh resistor R7, and the 1 pin of the semi-fixed resistor RV1; the 2 pin of the sixth resistor R6 and the negative terminal of VD4, and the 1 pin of the eighth resistor R8 Connected to pin 1 of the tenth resistor R10. Pin 1 of R7 is grounded to pin 2 of R8. Pin 2 of RV1 is connected to pin 1 of ninth resistor R9. Pin 2 of R9 is connected to pin 1 of C4, pin 1 of eleventh resistor R11, and pin 3 of positive input terminal of op amp U2. Pin 2 of R10 and pin 1 of C5, pin 1 of 12th resistor R12 and U2 The negative input terminal 2 is connected. Similarly, the 7-pin and 4-pin of the positive and negative power terminals of U2 are connected to the +15V and -15V power signals respectively. The 2 pin of C4 and the 2 pin of R11 are grounded; the 2 pin of R12 and the 2 pin of C5 are connected to the output pin 6 of U2, and the absolute value signal ROUT of the amplitude of the communication signal obtained after processing is output.

The circuit of the absolute value unit 1021 is composed of a positive and negative rectifier circuit with U1 as a core device and a differential proportional operational amplifier with U2 as a core device. In order to ensure that the output to input ratio is 1:1, the resistance values of R4, R5 and R6 should be equal, and the resistance values of R9, R10, R11 and R12 should be equal. In order to solve the output imbalance caused by the limited input resistance of the differential proportional op amp, the shunt resistors R7 and R8 are added to the design, and the semi-fixed resistor RV1 for balancing the waveform is added. In order to ensure the speed of the output signal, the diodes VD3 and VD4 need to use a Schottky-type diode with a small parasitic junction capacitance. C4 and C5 are phase compensation capacitors.

The control unit 1022 can be composed of a device such as a triode or a MOS transistor. The control unit 1022 in this embodiment is configured by a triode, as shown in FIG. 4, the circuit of the control unit 1022. The thirteenth resistor R13 includes a pin connected to the circuit output signal ROUT of the absolute value unit 1021 and a pin connected to the negative terminal of the Zener diode VD5. The anode of VD5 is connected to the base of transistor Q1 and the 2 pin of capacitor C6. Ground 1 of C6 is grounded. The collector of Q1 is connected to a +15V power supply, and its emitter output switching control signal is grounded through the fourteenth resistor R14.

Here, the voltage regulation value of VD5 is between 6V and 8V. C6 is configured for filtering, and R14 is used as a feedback resistor. Its resistance is taken at around 10K. When the input signal is RS232 signal, ROUT is a level higher than 10V, Q1 is turned on, and outputs the first switching control signal; when the input signal is RS485 signal, ROUT is a level of about 0V~6V, Q1 cannot Turning on, outputting a second switching control signal.

The input switching module 103 is configured to receive the switching control signal, and input the input signal to one of the multiple signal converting units corresponding to the first level type according to the switching control signal. In this embodiment, the input switching module 103 is composed of a high-speed switching device. As shown in FIG. 5, the power terminals VDD and VSS are respectively connected to the positive and negative power supplies +15V and -15V, and the output channels S1A and S2A are used for The input end of the RS232 signal conversion unit that converts the RS232 signal is connected; the S1B and S2B channels are connected to the input end of the RS485 signal conversion unit for converting the RS485 signal.

The control signals of the IN1 and IN2 channels are switching control signals received by the high speed switch from the control unit 1022. When the control signal is the second switching control signal, the high-speed switching switch is switched to the S1B and S2B channels, and the RXD and TXD signals input by the input protection module 106 input by D1 and D2 are sent to the input end of the RS485 signal conversion unit, wherein A The signal and the B signal are signals input to the RS485 signal conversion unit; when the control signal is the first switching control signal, the high-speed switching switch is switched to the S1A, S2A channel, and the RXD input by the input protection module 106, which is input by D1 and D2, and The TXD signal is sent to the input of the RS232 signal conversion unit, wherein the R-232 signal and the T-232 signal are signals input to the RS232 signal conversion unit. When selecting a high-speed switch, it should be noted that it needs to supply power to the positive and negative power supplies, and the power supply range needs to be larger than the level range of the RS232 signal. The high speed switch selected in this embodiment is the ADG5436.

The signal conversion module 104 includes a multi-channel signal conversion unit, each of the signal conversion units corresponding to a signal type communication signal, and each of the signal conversion units is configured to perform signal conversion on the received input signal and output . In this embodiment, the signal conversion module 104 includes an RS485 signal conversion unit composed of an RS485 signal conversion chip, such as a MAX1487 chip, and an RS232 signal conversion unit composed of an RS232 signal conversion chip, such as the MAX202E. At the same time, it should be noted that the control of the conversion chip here adopts the automatic flipping control of common hardware inversion, thereby realizing the hardware adaptation of the whole process (for other serial differential signals, it needs to be replaced with the corresponding signal conversion chip here) . After being converted by the signal conversion module 104, a TTL level signal corresponding to the input signal is obtained.

The serial input module 105 is connected to each of the signal conversion units and configured to output a signal output from any one of the signal conversion units. In the serial input module 105, the conversion signal RXD-485 corresponding to the RS485 signal and the conversion signal RXD-232 corresponding to the RS232 signal may be cascaded, and the conversion signal TXD-485 corresponding to the RS485 signal and the conversion signal corresponding to the RS232 signal TXD- 232 cascade, and then directly into the asynchronous serial port corresponding to the CPU. For many cases in the communication field where -48V is used as a reference ground, or when the CPU and the conversion chip are not in power supply, a high-speed optocoupler device can be connected, and the source side of the high-speed optocoupler device and the pair of asynchronous serial ports of the CPU can be connected. Dangling, the secondary side is connected to the serial input module 105, which can realize the conversion of the two-side level and the reference ground of the high-speed optocoupler device.

In the embodiment of the present invention, by detecting the amplitude of the communication signal, and determining the first signal type corresponding to the communication signal currently received by the input interface module according to the detected amplitude, generating a switching control signal corresponding to the first signal type; The control signal is switched, and the communication signal is input to one of the multiple signal conversion units corresponding to the first signal type. The hardware self-adaptive completion of the communication signal is realized, no manual operation is required, software programming is not involved, the trouble of developing related software is saved, the portability is improved, the operation error is reduced, and the same input interface module and a set of input are adopted. The processing module only occupies a pair of asynchronous serial interfaces of the CPU, and completely realizes two communication modes. The compatibility improves the integration of the circuit and saves resources.

Second embodiment

Referring to FIG. 2, FIG. 2 is a flowchart of a method for adaptive multiplexing of a communication interface hardware according to a second embodiment of the present invention, the method comprising:

Step 201: Receive one of a plurality of signal types of external input signals from a plurality of pins of an input interface module.

It should be noted that the communication signals of various signal types include an RS232 signal, other communication signals having a level difference with the RS232 signal, and other communication signals include at least an RS485 signal. Moreover, in order to reduce the influence of external interference on the system circuit, the communication signal received by the input interface module can also be subjected to EMC protection processing.

Step 202: Detect a magnitude of the communication signal, and determine, according to the detected amplitude, a first signal type corresponding to the communication signal currently received by the input interface module, and generate a switching control signal corresponding to the first signal type.

It should be noted that step 202 is to generate a switching control signal by using an absolute value of the amplitude of the communication signal, the process comprising: detecting the amplitude of the communication signal, and obtaining an absolute value of the amplitude; and determining the absolute value according to the amplitude And determining a first signal type corresponding to the communication signal currently received by the input interface module, and generating a switching control signal corresponding to the first signal type.

Step 203: Input a communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit according to the switching control signal.

It should be noted that each signal conversion unit corresponds to a signal type communication signal, and step 203 is to input the communication signal to the corresponding signal conversion unit according to the switching control signal, thereby correctly converting the communication signal.

Step 204: At the signal conversion module, after the signal is converted, the signal is output to a serial input module.

It should be noted that step 204 is performed by a signal conversion unit corresponding to the communication signal. The communication signal is converted into a corresponding TTL level signal.

Step 205: Receive a signal output by each signal conversion unit through a serial input module, and output the signal.

In the embodiment of the present invention, by detecting the amplitude of the communication signal, and determining the first signal type corresponding to the communication signal currently received by the input interface module according to the detected amplitude, generating a switching control signal corresponding to the first signal type; The control signal is switched, and the communication signal is input to one of the multiple signal conversion units corresponding to the first signal type. The hardware self-adaptive completion of the communication signal is realized, no manual operation is required, software programming is not involved, the trouble of developing related software is saved, the portability is improved, the operation error is reduced, and the same input interface module and a set of input are adopted. The processing module only occupies a pair of asynchronous serial interfaces of the CPU, completely realizes the compatibility of the two communication modes, improves the integration degree of the circuit, and saves resources.

Those of ordinary skill in the art will appreciate that the disclosed systems and methods may be implemented in other manners. For example, the system embodiments described above are merely illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. Go to another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Industrial applicability

The device of the embodiment of the invention includes: an input interface module configured to receive one of a plurality of signal types of external input signals; the detection and determination module configured to detect the amplitude of the communication signal, and according to the detected amplitude Determining a first signal type corresponding to the current communication signal, generating a switching control signal corresponding to the first signal type; and inputting a switching module configured to input the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit; The conversion module is configured to perform signal conversion on the received communication signal and output; the serial input module is configured to output a signal output from any one of the signal conversion units; thus, the existing communication interface adaptive multiplexing device is solved. Software participation, poor portability, complex structure and low reliability.

Claims

A communication interface hardware adaptive multiplexing device, comprising:

The input interface module is configured to receive one of a plurality of signal types of external input signals through a plurality of pins of the plurality;

The detecting and determining module is configured to detect the amplitude of the communication signal, and determine, according to the detected amplitude, a first signal type corresponding to the communication signal currently received by the input interface module, to generate a signal type corresponding to the first signal Switching control signal;

The input switching module is configured to receive the switching control signal, and input the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit according to the switching control signal;

a signal conversion module, the signal conversion module includes a multi-channel signal conversion unit, each of the signal conversion units corresponds to a signal type communication signal, and each of the signal conversion units is configured to perform signal conversion on the received communication signal and output ;

The serial input module is connected to each of the signal conversion units and configured to output a signal output from any one of the signal conversion units.
The device of claim 1 , wherein the device further comprises an input protection module configured to perform EMC protection processing on the communication signal received by the input interface module;

The detecting and determining module is configured to detect a magnitude of the communication signal processed by the input protection module, and generate the switching control signal according to the detection result;

The input switching module is configured to input the communication signal processed by the input protection module to one of the multiple signal conversion units according to the switching control signal.
The apparatus of claim 1, wherein the detection determination module comprises:

Taking an absolute value unit, configured to detect a magnitude of the communication signal, and obtain an absolute value of the amplitude;

a control unit configured to determine the input interface module based on an absolute value of the amplitude A first signal type corresponding to the currently received communication signal generates a switching control signal corresponding to the first signal type.
The apparatus of claim 1, wherein the plurality of signal types of communication signals comprise RS232 signals, other communication signals having a level difference from the RS232 signals, and the other communication signals include at least RS485 signals.
The apparatus of claim 1 wherein said input interface module comprises a first pin, a second pin, and a third pin configured to receive one of a plurality of signal types of externally input signals.
A method for implementing adaptive multiplexing of a communication interface hardware by using the apparatus according to any one of claims 1-5, comprising:

Receiving one of a plurality of signal types of external input signals from a plurality of pins of an input interface module;

Detecting an amplitude of the input signal, and determining, according to the detected amplitude, a first signal type corresponding to the communication signal currently received by the input interface module, generating a switching control signal corresponding to the first signal type;

Transmitting, according to the switching control signal, the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit;

At the signal conversion module, after the signal is converted, the signal is output to a serial input module;

The signal output by each signal conversion unit is received by the serial input module and output.
The method of claim 6 wherein said step of detecting said amplitude of said communication signal further comprises:

Performing EMC protection processing on the communication signal received by the input interface module;

The detecting the amplitude of the communication signal, further, after being processed by the EMC protection The amplitude of the communication signal is detected;

And inputting, according to the switching control signal, the communication signal to a path corresponding to the first signal type in the multi-channel signal conversion unit, and further, according to the switching control signal, the EMC-protected device The communication signal is input to one of the multiple signal conversion units.
The method of claim 6, wherein the detecting the amplitude of the communication signal, and determining the first signal type corresponding to the communication signal currently received by the input interface module according to the detected amplitude, generating a corresponding The switching control signal of the first signal type includes:

Detecting a magnitude of the communication signal and obtaining an absolute value of the amplitude;

Determining, according to the absolute value of the amplitude, a first signal type corresponding to the communication signal currently received by the input interface module, and generating a switching control signal corresponding to the first signal type.
The method of claim 6 wherein said plurality of signal types of communication signals comprise RS232 signals, other communication signals having a level difference from said RS232 signals, said other communication signals comprising at least RS485 signals.