CN111835598A - Testing method and system compatible with non-polar 485 networking simulation - Google Patents

Testing method and system compatible with non-polar 485 networking simulation Download PDF

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Publication number
CN111835598A
CN111835598A CN202010753858.0A CN202010753858A CN111835598A CN 111835598 A CN111835598 A CN 111835598A CN 202010753858 A CN202010753858 A CN 202010753858A CN 111835598 A CN111835598 A CN 111835598A
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China
Prior art keywords
networking
polar
simulation
polarity
communication
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CN202010753858.0A
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Chinese (zh)
Inventor
欧新
孙航
郝凤柱
王轶群
赵云斌
张鸷
张洪忠
吴月家
董天强
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Guizhou Power Grid Co Ltd
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Guizhou Power Grid Co Ltd
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Priority to CN202010753858.0A priority Critical patent/CN111835598A/en
Publication of CN111835598A publication Critical patent/CN111835598A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/50Testing arrangements

Abstract

The invention discloses a test method and a test system compatible with polarity 485 networking simulation, wherein the test method comprises the steps of connecting a tested product containing a 485 chip with a communication module and carrying out data transmission; the identification unit judges whether the 485 chip on the tested product accessed to the communication bus has polarity or no polarity; the identification unit outputs a corresponding control signal to the switching unit according to the judgment result; the switching unit controls the switching unit to be connected with the polar 485 networking simulation unit or the non-polar 485 networking simulation unit according to the received control signal; the upper computer is connected with the communication module through the receiver and tests networking communication of a 485 chip of the tested product, and networking communication capacity of the tested product is judged. The invention has the beneficial effects that: the 485 networking test compatible with polarity and non-polarity is flexible and effective, the test success rate is higher, the principle is simple, the equipment cost is low, the result can be directly checked without complex operation during detection, and the method is fast and efficient.

Description

Testing method and system compatible with non-polar 485 networking simulation
Technical Field
The invention relates to the technical field of 485 networking test, in particular to a test method and a test system compatible with 485 networking simulation with or without polarity.
Background
In recent years, 485 networking has been used in a variety of applications, including industrial and residential applications. The RS485 is generally more suitable for a system structure of master and slave networking, and can be applied one-to-one.
The 485 networking test is that the 485 communication interfaces of N products with 485 circuits are connected into the same 485 bus, and then the 485 receiver is butted with the product of a certain 485 circuit on the bus to carry out the communication test. The 485 networking simulation test simulates the load of N products with 485 through a certain simulation circuit, the tested products and the simulation circuit are connected into a 485 bus together, and the receiver tests the communication capacity of the 485 of the tested products
In the prior art, a polar RS485 networking simulation circuit is used for simulating networking test of the polar RS485, and a self-adaptive networking simulation test also called as a non-polar RS485 is not available, and the prior networking simulation test has single function, low flexibility and few test items, and can not completely simulate the field 485 networking condition and environment, so that the test result is not accurate enough.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, one technical problem solved by the present invention is: the testing method compatible with the polar or non-polar 485 networking simulation is provided, the polar or non-polar 485 networking test can be compatibly simulated, and the test result can be conveniently obtained.
In order to solve the technical problems, the invention provides the following technical scheme: a test method compatible with non-polar 485 networking simulation comprises the steps that a tested product containing a 485 chip is connected with a communication module and can carry out data transmission; the identification unit judges whether the 485 chip on the tested product accessed to the communication bus has polarity or no polarity; the identification unit outputs a corresponding control signal to the switching unit according to the judgment result; the switching unit controls the switching unit to be connected with the polar 485 networking simulation unit or the non-polar 485 networking simulation unit according to the received control signal; the upper computer is connected with the communication module through the receiver and tests networking communication of a 485 chip of the tested product, and networking communication capacity of the tested product is judged.
As a preferred scheme of the test method compatible with the 485 network simulation with or without polarity, the test method comprises the following steps: the communication module comprises a communication bus, the communication bus comprises an A line and a B line, an A line interface of a product to be tested is connected with the A line during connection, and a B line interface is connected with the B line.
As a preferred scheme of the test method compatible with the 485 network simulation with or without polarity, the test method comprises the following steps: the data transmission is realized by connecting the receiver into the communication module and by outputting a pressure difference signal between the line A and the line B and the 485 chip of the product to be detected.
As a preferred scheme of the test method compatible with the 485 network simulation with or without polarity, the test method comprises the following steps: the identification unit judges whether the 485 chip has polarity or no polarity by detecting the interface voltage between the line A and the line B.
As a preferred scheme of the test method compatible with the 485 network simulation with or without polarity, the test method comprises the following steps: the switching unit includes a relay switch circuit selectively connected according to a control signal.
As a preferred scheme of the test method compatible with the 485 network simulation with or without polarity, the test method comprises the following steps: the communication test of the group network comprises the steps of sending a communication command frame to the 485 bus through the receiver, circulating communication data, and judging the probability of successful communication according to whether the upper computer can receive a response frame of a tested product.
The invention solves another technical problem that: a test system compatible with the non-polar 485 networking simulation is provided, so that the test method can be realized by depending on the system.
In order to solve the technical problems, the invention provides the following technical scheme: a testing device compatible with non-polar 485 networking simulation comprises a receiver, wherein the receiver is used for receiving an instruction sent by an upper computer; the identification unit can judge whether the 485 chip on the tested product has polarity and output a corresponding control signal to the switching unit; the switching unit switches the connection state of the switching unit and the polar 485 analog networking unit or the non-polar 485 analog networking unit according to the control signal; the system comprises a polar 485 analog networking unit and a non-polar 485 analog networking unit, wherein the polar 485 analog networking unit and the non-polar 485 analog networking unit are used for testing the networking communication of a 485 chip of a tested product and judging the networking communication capability of the tested product; and the upper computer is used for testing and judging the networking communication capability of the tested product.
As a preferred scheme of the test system compatible with the 485 network simulation with or without polarity, the test system comprises: the identification unit includes an AD detection circuit and a signal control circuit.
The invention has the beneficial effects that: by designing the simulation 485 networking circuit, the invention can compatibly simulate the networking test of the non-polar 485 on the basis of meeting the simulation of the polar 485 networking, has higher test flexibility and success rate and simple principle, can manufacture equipment with low detection cost in practical application, can directly check the result without complex operation during detection, and is quick and efficient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic overall flow chart of a testing method compatible with non-polar 485 networking simulation according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of the polar 485 analog networking module according to the present invention;
fig. 3 is a schematic circuit structure diagram of the non-polar 485 analog networking module according to the present invention;
FIG. 4 is a schematic diagram of an AD detection circuit of the identification unit according to the present invention;
fig. 5 is a schematic overall structure diagram of a test system compatible with 485 networking simulation with or without polarity according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to the schematic diagram of fig. 1, which is an overall flowchart of a testing method compatible with 485 networking simulation with or without polarity according to this embodiment, the method specifically includes,
s1: connecting a tested product containing a 485 chip with the analog networking unit through a communication bus and carrying out data transmission;
specifically, the analog networking unit includes a polar 485 analog networking module or a nonpolar 485 networking module, refer to the schematic diagrams of fig. 2 and fig. 3, which are circuit schematic diagrams of a polar analog networking module and a nonpolar analog networking module, in this embodiment, the analog circuits of AB line interface loads of 485 products are respectively represented, for resistors R1 and R2 in the polar analog networking circuit being 200 Ω, each divided by 100, which is equivalent to 100 resistors connected in parallel, since the A, B interface of each 485 circuit is connected with a pull-up resistor and a pull-down resistor, assuming that 485 products with 100 are all connected to a bus, the a line on the 485 bus is equivalent to 100 pull-up resistors, and similarly, the B line is provided with 100 pull-down resistors; c1 is a capacitor of 104K, 100 transient diodes Z1 are simulated, junction capacitance of the transient diodes is 102K, namely 1NF, under the normal communication frequency of a 485 chip, and 100 simulated capacitors are equivalent to 104K, namely 100 NF; for the non-polar analog networking circuit, because the non-polar 485 chip is not provided with the pull-up and pull-down resistors R1 and R2, the analog networking circuit is not required to be provided with resistors, and the arrangement of the capacitor C1 is the same as that of the polar analog networking circuit.
The communication bus comprises a line a and a line B, and referring to the illustrations in fig. 2 and fig. 3, the present embodiment adopts a general 485 networking default connection, that is, all the circuit line a are combined together, and all the circuit line B are combined together to jointly form the line a and the line B of the communication bus. When the tested product is connected with the communication bus, the A line interface of the tested product is connected with the A line, and the B line interface is connected with the B line.
S2: the identification unit judges whether the 485 chip of the tested product has polarity or no polarity;
the identification unit comprises an AD detection circuit, the judgment of the identification unit is based on the magnitude of signal voltage on the communication bus, specifically, for a 485 chip with polarity, because the 485 chip with polarity does not have an automatic polarity judgment circuit, an initial fixed level is required to be given to the chip through the communication bus, for example, the A line is higher than the B line and is lower, therefore, the A line is required to be connected with a pull-up resistor to a power supply, and the B line is required to be connected with a pull-down resistor to the ground of the chip; for the non-polar 485 chip, the level polarity on the communication bus can be automatically judged, so that the A line interface can be connected with the A line and the B line interface can be connected with the B line or reversely connected for the non-polar 485 chip.
Since the 485 chip with polarity needs to have a fixed initial level, the a line of the 485 chip with polarity is usually connected to the pull-up resistor and the B line is connected to the pull-down resistor and the ground, in this embodiment, the 5V power supply is selected as the power supply and connected to the pull-up resistor of the a line, and the pull-up resistor is set as R1The pull-down resistance is R2And the AB impedance of the 485 chip is RABVoltage V between AB interfacesABIn order to realize the purpose,
VAB=5*RAB/(RAB+R1+R2)
the resistance value range of the pull-up and pull-down resistor is 5k omega-20 k omega, the impedance between A and B in the 485 chip with the polarity is at least more than 100k omega, and therefore the voltage difference of the AB interface can be obtained to be more than 3V through voltage division; and the communication interface of the nonpolar 485 chip is not provided with an upper pull-down resistor, and the AB signal is in a high-resistance state, so that the voltage difference between the AB, namely the interface voltage, is less than 0.5V.
Specifically, referring to the schematic of fig. 4, for the AD detection circuit constructed in this embodiment, LM393 is a dual-voltage comparator with a lower offset voltage, the 485A line is connected to the non-inverting input terminal of LM393 through a load resistor R2, the 485B line is connected to the inverting input terminal of LM393 through a load resistor R1, the 7-pin of LM393 outputs an OUT comparison signal, the 8-pin is connected to the V485 power supply, and the 4-pin is connected to GND. When the AD detection circuit judges the polarity, it is based on the voltage V between the AB linesABIf the difference is greater than 3V, the in-phase input end of the LM393 is greater than the reverse input end, and the output signal of the LM393 is at a high level; when the non-polarity judgment is carried out, the voltage difference between the AB lines is 0 when the polarity is not carried out, the output pin output is low level because the low offset voltage of the LM393 allows the output to be clamped at zero level and the low offset voltage is about 1.0 mV.
Therefore, the AD detection circuit can judge whether the 485 chip on the tested product of the accessed communication bus is polar or non-polar by detecting the signal voltage on the communication bus, if the signal voltage is more than 3V, the 485 chip of the tested product is judged to be polar, and if the signal voltage is less than 0.5V, the 485 chip of the tested product is judged to be non-polar.
S3: the identification unit outputs a corresponding control signal to the switching unit according to the judgment result;
specifically, the identification unit further comprises a signal control circuit, and the signal control circuit sends a corresponding control signal to the switching unit according to the judged presence or absence of the polarity of the 485 chip of the detected product, so that the switching unit correspondingly changes the connection of the switching unit.
S4: the switching unit controls the switching unit to be communicated with a polar 485 analog networking module or a non-polar 485 networking module in the analog networking unit according to the received control signal;
specifically, the switching unit comprises a relay switch circuit, a switch of the switching unit is controlled by a control signal sent by the identification unit, the relay switch circuit is connected with the polar 485 networking simulation module of the simulation networking unit in a normal state, when the identification unit detects that a tested product is nonpolar 485, the switching unit sends out a control signal, and the networking simulation switching unit is controlled to be connected with the nonpolar 485 networking simulation module.
S5: the upper computer is connected with the communication module through the receiver and tests networking communication of a 485 chip of the tested product, and networking communication capacity of the tested product is judged. The communication test of the group network comprises the steps of sending a communication command frame to the 485 bus through the receiver, circulating communication data, and judging the probability of successful communication according to whether the upper computer can receive a response frame of a tested product.
Specifically, the upper computer is a computer, in this embodiment, the computer communication software sends a communication command frame to the 485 bus through the receiver, and circulates the communication data for 1000 times, the number of times may also be greater than 1000 times, if the communication is successful, the computer can receive a response frame of the testing device, the computer calculates the ratio of the number of successful communications to the total number of communications, and if the ratio is greater than 95%, the overall communication is considered to be successful, so as to determine the networking communication capability of the tested product.
Scene one:
in order to verify the advantages of the testing method compatible with the 485-network-with-or-without-polarity simulation, which is provided by the embodiment, compared with the conventional method, the following experiments are performed to illustrate that the conventional testing method and the testing method of the embodiment are selected to perform experiments respectively and compare results. The traditional test method is to simulate networking test on the polarized RS485 through a polarized RS485 simulation networking circuit, but the networking simulation test on the adaptive nonpolar RS485 is not available at present.
Selecting 485 networking equipment with 10 polarities and 485 networking equipment without 10 polarities, disordering the 485 networking equipment, respectively adopting a traditional test method and the test method of the embodiment to test and output test results, and obtaining the following experimental results:
table 1: comparison of the results of tests conducted by the method of the present embodiment and the conventional method
Compared with the traditional test method, the test method has the advantages that the special non-polar networking analog circuit is not arranged, so that only polar networking is identified, but non-polar networking cannot be identified, the test method provided by the embodiment can identify and switch the polarity of the chip to be tested according to the polarity of the chip to be tested to be connected with the corresponding networking analog circuit for testing, and the test function is more comprehensive and flexible; it can also be seen from observing the success rate of the detection that the test method of this embodiment has a higher success rate, especially in the detection of non-polar networking, because the traditional detection method has no special non-polar identification and test, when testing non-polar 485 networking, a polar networking analog circuit is still used, so the test success rate is lower than the method of this embodiment, and the method of this embodiment can more comprehensively simulate the situation and environment of on-site 485 networking, and improve the success rate of the test.
Example 2
Referring to the schematic diagram of fig. 5, the schematic diagram is a structure diagram of a test system compatible with the non-polar 485 networking simulation, the test method compatible with the non-polar 485 networking simulation of the above embodiment can be realized depending on the system, and the system specifically includes a receiver, an identification unit, a switching unit, a simulation networking unit and an upper computer, wherein the receiver is used for receiving an instruction issued by the upper computer; the identification unit can judge whether the 485 chip on the tested product has polarity and output a corresponding control signal to the switching unit; the switching unit switches the connection state of the analog networking unit according to the control signal; the simulation networking unit comprises a communication bus for connection, and can test the networking communication of a 485 chip of a tested product; the upper computer is a computer and is used for testing and judging the networking communication capability of the tested product.
Specifically, the identification unit includes an AD detection circuit and a signal control circuit. The AD detection circuit comprises a detection chip, the detection chip is used for detecting voltage difference, the signal control circuit comprises a single chip microcomputer, and the single chip microcomputer can be used for controlling signal sending and controlling the connection of the polar 485 analog networking unit and the non-polar 485 analog networking unit.
The analog networking unit comprises a polar 485 analog networking module and a nonpolar 485 analog networking module, and the circuit structures of the analog networking unit can refer to the schematic diagrams of fig. 2 and fig. 3 and are respectively used for testing a tested product comprising a polar 485 chip and a nonpolar 485 chip.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (8)

1. A test method compatible with polarity 485 networking simulation is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
connecting a tested product containing a 485 chip with the analog networking unit through a communication bus and carrying out data transmission;
the identification unit judges whether the 485 chip of the tested product has polarity or no polarity;
the identification unit outputs a corresponding control signal to the switching unit according to the judgment result;
the switching unit controls the switching unit to be communicated with a polar 485 analog networking module or a non-polar 485 networking module in the analog networking unit according to the received control signal;
the upper computer is connected with the communication module through the receiver and tests networking communication of a 485 chip of the tested product, and networking communication capacity of the tested product is judged.
2. The test method compatible with the 485 networking simulation with or without polarities of claim 1, wherein: the communication bus comprises an A line and a B line of the analog networking unit, an A line interface of a tested product is connected with the A line during connection, and a B line interface is connected with the B line.
3. The test method compatible with the presence or absence of polarity 485 networking simulation of claim 1 or 2, wherein: the data transmission is realized by connecting the receiver into the communication bus and by outputting a pressure difference signal between the line A and the line B and the 485 chip of the product to be detected.
4. The test method of claim 3 compatible with the 485 networking simulation with or without polarities, wherein: the identification unit is connected with the communication bus and judges whether the 485 chip has polarity or no polarity by detecting the interface voltage between the line A and the line B.
5. The test method compatible with the 485 networking simulation with or without polarities of claim 1, wherein: the switching unit comprises a relay switch circuit, and the relay switch circuit is selectively connected with a polar 485 analog networking module or a non-polar 485 networking module in the analog networking unit according to a control signal.
6. The test method compatible with the 485 networking simulation with or without polarities of claim 1, wherein: the communication test of the group network comprises the steps of sending a communication command frame to the 485 bus through the receiver, circulating communication data, and judging the probability of successful communication according to whether the upper computer can receive a response frame of a tested product.
7. The utility model provides a compatible test system that has or not polarity 485 networking simulation which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the receiver is used for receiving an instruction sent by an upper computer;
the identification unit comprises an AD detection circuit and a signal control circuit, can judge whether the 485 chip on the product to be detected has polarity, and outputs a corresponding control signal to the switching unit;
the switching unit switches the connection state of the analog networking unit according to the control signal;
the simulation networking unit comprises a communication bus for connection, and can test the networking communication of a 485 chip of a tested product;
and the upper computer is used for testing and judging the networking communication capability of the tested product.
8. The test device of claim 7 compatible with polar or non-polar 485 networking simulation, wherein: the simulation networking unit comprises a polar 485 simulation networking module and a nonpolar 485 simulation networking module and is respectively used for testing a tested product comprising a polar 485 chip and a nonpolar 485 chip.
CN202010753858.0A 2020-07-30 2020-07-30 Testing method and system compatible with non-polar 485 networking simulation Pending CN111835598A (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN104865470A (en) * 2015-05-22 2015-08-26 国家电网公司 Portable networking test device based on RS-485 communication technology
CN106546833A (en) * 2015-09-16 2017-03-29 中国电力科学研究院 A kind of electric energy meter RS-485 communication chip networking test systems
CN107193697A (en) * 2017-05-05 2017-09-22 西安电子工程研究所 A kind of method for realizing the nonpolarity connections of RS485

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Publication number Priority date Publication date Assignee Title
CN104865470A (en) * 2015-05-22 2015-08-26 国家电网公司 Portable networking test device based on RS-485 communication technology
CN106546833A (en) * 2015-09-16 2017-03-29 中国电力科学研究院 A kind of electric energy meter RS-485 communication chip networking test systems
CN107193697A (en) * 2017-05-05 2017-09-22 西安电子工程研究所 A kind of method for realizing the nonpolarity connections of RS485

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