CN106685479A - Method and system for fault excitation in RS485 communication of electric energy meter - Google Patents
Method and system for fault excitation in RS485 communication of electric energy meter Download PDFInfo
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- CN106685479A CN106685479A CN201710007072.2A CN201710007072A CN106685479A CN 106685479 A CN106685479 A CN 106685479A CN 201710007072 A CN201710007072 A CN 201710007072A CN 106685479 A CN106685479 A CN 106685479A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention relates to a method and system for fault excitation in RS485 communication of an electric energy meter. The method includes the steps of setting test parameters of RS485 carrying capacity, the test parameters including the baud rate and load impedance value test interval; using a binary algorithm to select a load impedance value within the test interval as the load test value; sending the frame command including the load test value to an RS485 load detection device, the RS485 load detection device being used for controlling a servo motor drive module to drive a sliding rheostat based on the frame command so that the sliding rheostat outputs the corresponding load impedance to an RS485 interface of an intelligent electric energy meter with an RS485 function, and sending a meter reading command to the intelligent electric energy meter with the RS485 function; and according to a critical point of the received response signal, obtaining a load limit value of the intelligent electric energy meter with the RS485 function. The method and system provided by the embodiment of the invention have high efficiency of obtaining the load limit value, high accuracy of the obtained load limit value and high durability.
Description
Technical field
The present invention relates to the failure exciting method in Electric Measurement Technology field, more particularly to a kind of electric energy meter RS485 communications
And system.
Background technology
RS485 communications are used widely at present in industrial automation, such as in intelligent electric meter, RS485 marks
Quasi- serial communication interface is communicated as terminals such as the communication interface in intelligent electric meter and harvesters.Due to the peace of intelligent electric meter
Dress environment and the factor such as use condition and itself quality, intelligent electric meter can occur some communication failures in running,
Cause the reliability for communicating not high, and the communication performance test that RS485 interfaces are carried out to intelligent electric meter can communicate as its is judged
The important means of reliability.
In prior art, it is to the communication performance method of testing of the RS485 interfaces of intelligent electric meter：Manually build in laboratory
Test environment, using the relay switching being arranged in printed board the load of intelligent electric meter is accessed, and judges that intelligent electric meter is being accessed
Whether can communicate successfully after the load of certain resistance, so as to obtain the load resistance model that intelligent electric meter success communication can be carried
Enclose, using the load Standard resistance range as electric energy meter communication reliability important indicator.
But, need to realize switching different loads by carrying out multiple relays connection in series-parallel using relay switching load
Resistance, programming is complex, and can only switch the load of specific resistance, it is impossible to realize electrodeless test, test it is accurate
Degree is poor；Prior art is that its testing efficiency is relatively low using to loading the scope that load resistance is drawn by the way of resistance is traveled through entirely；
Further, since the relay number for needing is more, the space of larger printed board can be taken, and relay has the restriction in life-span,
Therefore ruggedness is poor.
The content of the invention
To overcome problem present in correlation technique, the failure that the present invention is provided in a kind of electric energy meter RS485 communications to excite
Method and system.
First aspect according to embodiments of the present invention, there is provided the failure exciting method in a kind of electric energy meter RS485 communications, bag
Include：
The test parameter of RS485 load capacities is set, wherein, the test parameter includes and the intelligence with RS485 functions
The test of baud rate and load impedance value that energy electric energy meter is communicated is interval；
By the use of Bisection Algorithms the load impedance value in the test interval is selected as load testing value；
Frame ordering comprising the load testing value is sent to into RS485 Weight detectors, the RS485 load detectings
Device is used for according to the frame ordering, and control servomotor drive module drives slide rheostat, makes the slide rheostat defeated
Go out corresponding load impedance to the intelligent electric energy meter with RS485 functions, to the intelligent electric energy with RS485 functions
Table sends order of checking meter；
According to the critical point for receiving response signal, the load limit of the intelligent electric energy meter with RS485 functions is obtained
Value, wherein, the response signal includes answer number of the intelligent electric energy meter with RS485 functions to the order of checking meter
According to.
Preferably, it is described to select the load impedance value in the test interval as load testing value bag by the use of Bisection Algorithms
Include：
The interval intermediate value of the test is selected as load testing value；
Response signal of the intelligent electric energy meter with RS485 functions to order of checking meter according to receiving, selects the survey
The intermediate value of the interval threshold value of examination and last time load testing value is used as the load testing value tested again；
Response signal of the intelligent electric energy meter with RS485 functions to order of checking meter according to not receiving, before selection
Twice the intermediate value of load testing value is used as the load testing value tested again.
Preferably, the frame life is sent respectively to multiple RS485 Weight detectors by serial server simultaneously
Order.
Preferably, the order of checking meter includes that the date-time for making a copy of the intelligent electric energy meter with RS485 functions leads to
News frame, the response signal includes the date-time communication frames.
Second aspect according to embodiments of the present invention, there is provided the failure activating system in a kind of electric energy meter RS485 communications, bag
Host computer, RS485 Weight detectors and the intelligent electric energy meter with RS485 functions being sequentially connected electrically is included, wherein：
The host computer, for arranging the test parameter of RS485 load capacities, to the RS485 Weight detectors
Send the frame ordering comprising the load testing value and calculate the limit load of the intelligent electric energy meter with RS485 functions
Value；
The RS485 Weight detectors, for according to the frame ordering, control servomotor drive module drives to slide
Rheostat, makes the slide rheostat export corresponding load impedance to the intelligent electric energy meter with RS485 functions, to institute
State the intelligent electric energy meter with RS485 functions and send order of checking meter；
The intelligent electric energy meter with RS485 functions, for the response of order of checking meter described in host computer transmission
Signal.
Preferably, also including serial server, the host computer is negative with multiple RS485 by the serial server
Carry detection means electrical connection.
Preferably, the RS485 Weight detectors drive comprising RS232 communication modules, MCU control module, servomotor
Dynamic model block, adjustable resistance module and RS485 communication modules；
The RS232 communication modules are used for the RS485 Weight detectors by the serial server and described
Host computer is communicated；
The MCU control module is used to control servomotor in the servomotor drive module according to the frame ordering
Rotation direction, to the intelligent electric energy meter with RS485 functions order of checking meter is sent, and the response signal is sent to described
Host computer；
The servomotor drive module is used to adjust the resistance value of the adjustable resistance module；
The adjustable resistance module includes the slide rheostat, and the slide rheostat is used to adjust the resistance value,
The resistance value is the load impedance value accessed between A, B line in the RS485 communication modules；
The RS485 communication modules are used for the RS485 Weight detectors and the intelligence with RS485 functions
Electric energy meter is communicated.
The technical scheme that embodiments of the invention are provided can include following beneficial effect：
Failure exciting method in electric energy meter RS485 communications provided in an embodiment of the present invention, using what is arranged in host computer
Bisection Algorithms are controlled to the size of the output load impedance of RS485 Weight detectors, so as to obtain with RS485 functions
Intelligent electric energy meter load threshold value, obtain load threshold value efficiency high；RS485 Weight detectors pass through servomotor
Control slide rheostat adjusts output loading, realizes stepless resistance trimming, and then makes the load threshold value accuracy of acquisition high；This
Failure activating system in the electric energy meter RS485 communications that bright embodiment is provided, adjustable resistance module is slide rheostat, ruggedness
By force.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The present invention can be limited.
Description of the drawings
Accompanying drawing herein is merged in description and constitutes the part of this specification, shows the enforcement for meeting the present invention
Example, and be used to explain the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is that the flow process of the failure exciting method in a kind of electric energy meter RS485 communications provided in an embodiment of the present invention is illustrated
Figure；
Fig. 2 is the schematic flow sheet that a kind of utilization Bisection Algorithms provided in an embodiment of the present invention select load testing value；
Fig. 3 is the structural representation of the failure activating system in a kind of electric energy meter RS485 communications provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of structural representation of RS485 Weight detectors provided in an embodiment of the present invention.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.Conversely, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects described in detail in claims, the present invention.
Fig. 1 is the stream of the failure exciting method in a kind of electric energy meter RS485 communications according to an exemplary embodiment
Cheng Tu, as shown in figure 1, the failure exciting method during the RS485 that the present embodiment is provided communicates, including：
S110：The test parameter of RS485 load capacities is set, wherein, the test parameter includes and carries RS485 functions
The baud rate that communicated of intelligent electric energy meter and load impedance value test it is interval.
Specifically, RS485 load capacity automatic test softwares are developed in host computer, test software is used to carry out this reality
Apply the RS485 failure challenge tests of example.The test for arranging baud rate and load impedance value in test software is interval, wherein, this reality
In applying example, baud rate is preferably arranged to 2400bps, can meet RS485 proper communication requirements, and the test interval of load impedance value is excellent
Elect 1-1999 Ω as, wherein, 1 Ω is that the communication that general communication test draws is carried out to the intelligent electric energy meter with RS485 functions
Failure resistance value, 1999 Ω are that the communication success that general communication test draws is carried out to the intelligent electric energy meter with RS485 functions
Resistance value, certainly, also may be selected other resistance values as interval communication success resistance value and communication failure resistance value is tested,
Protection scope of the present invention should be belonged to.
Further, also including the range of error of load threshold value, in the present embodiment, range of error is preferably test parameter
1Ω。
S120：By the use of Bisection Algorithms the load impedance value in test interval is selected as load testing value.
It is the load threshold value for quickly obtaining the intelligent electric energy meter with RS485 functions in the present embodiment, selects test section
Interior fractional load resistance value is repeatedly tested as load testing value, referring to Fig. 2, for the utilization two that the present embodiment is provided
Divide the schematic flow sheet of algorithms selection load testing value, specifically include following steps：
S210:The interval intermediate value of test is selected as load testing value；
Specifically, it is 1-1999 Ω as tested interval, then selects load testing value to be 1000 Ω；
S220:According to response signal of the intelligent electric energy meter with RS485 functions to order of checking meter is received, last time was selected to bear
The intermediate value that test value is carried with last time communication failure resistance value is used as the load testing value tested again；
Specifically, according to load testing value be 1000 Ω when, host computer receives the intelligent electric energy meter pair with RS485 functions
Check meter the response signal of order, then 1000 Ω communicated successfully resistance value for last time, and last time communication failure resistance value is 1 Ω, because
This, selects the load testing value tested again to be (1000+1)/2=500.5 Ω.
S230:According to not receiving response signal of the intelligent electric energy meter with RS485 functions to order of checking meter, in selection
Secondary load testing value communicated with last time successful resistance value intermediate value as the load testing value tested again.
Specifically, according to load testing value be 500.5 Ω when, host computer do not receive with RS485 functions intelligence electricity
Can response signal of the table to order of checking meter, then 500.5 Ω are last time communication failure resistance value, and the last time successfully resistance value that communicates is
1000 Ω, therefore, select the load testing value tested again to be (1000+500.5)/2=775.25 Ω.
Further, step S210-S230, is the specific implementation process that load testing value is chosen using Bisection Algorithms, by
In the selection that the load threshold value of the intelligent electric energy meter with RS485 functions is different and test is interval can not equal factor, can be many
Secondary repeat step S220-S230, chooses multiple load testing values and is tested.
S130：Frame ordering comprising load testing value is sent to into RS485 Weight detectors, RS485 load detectings dress
Put for according to frame ordering, control servomotor drive module to drive slide rheostat, make slide rheostat output corresponding negative
Impedance is carried to the intelligent electric energy meter with RS485 functions, and order of checking meter is sent to the intelligent electric energy meter with RS485 functions.
Specifically, host computer is communicated by serial server with multiple RS485 Weight detectors：Host computer leads to
Serial server is crossed while multiple RS485 Weight detectors are sent respectively with load testing value and order of checking meter, and it is multiple
RS485 Weight detectors respectively with the one-to-one connection of multiple intelligent electric energy meters with RS485 functions, and then realize to multiple
The concurrent testing of the intelligent electric energy meter with RS485 functions, improves and intelligent electric energy meter of the high-volume with RS485 functions is entered
The efficiency of row test.
In the present embodiment, order of checking meter includes making a copy of the date-time communication frames of the intelligent electric energy meter with RS485 functions,
Certainly, order of checking meter is alternatively the other information for making a copy of the intelligent electric energy meter with RS485 functions, such as power information.
S140：According to the critical point for receiving response signal, the load limit of the intelligent electric energy meter with RS485 functions is obtained
Value, wherein, response signal includes reply data of the intelligent electric energy meter with RS485 functions to order of checking meter.
Specifically, RS485 Weight detectors receive response of the intelligent electric energy meter with RS485 functions to order of checking meter
Signal, response signal includes the reply data to order of checking meter, such as date-time communication frames, if received successfully, will response
Signal is transmitted to host computer, and according to response signal is received, the load testing value for judging this test is higher than to carry to host computer
The load threshold value of the intelligent electric energy meter of RS485 functions, then need return to step S220, and using Bisection Algorithms load is reselected
Test value is tested.
Further, if RS485 Weight detectors receive response signal failure, to host computer alarm signal is sent
Number, host computer judges the load testing value of this test less than the intelligence electricity with RS485 functions according to alarm signal is received
The load threshold value of energy table, then need return to step S230, reselects load testing value using Bisection Algorithms and is tested.
Host computer obtains the load of the intelligent electric energy meter with RS485 functions according to the critical point for receiving response signal
Ultimate value.Wherein, obtaining the process of critical point includes：It is 1 Ω according to the range of error of load threshold value, in test process,
When the difference that there is a certain communicate successfully resistance value and a certain communication failure resistance value is less than 1 Ω, then critical point is in the communication
Between successful resistance value and communication failure resistance value, the intermediate value of the communication success resistance value and communication failure resistance value can be chosen
As the load threshold value of the intelligent electric energy meter with RS485 functions.
In the present embodiment, due to host computer receive signal be one of response signal or alarm signal, therefore, connect
The critical point of the response signal for receiving, that is, receive the distinctive points of response signal and alarm signal, critical point (distinctive points) institute
The load impedance value of representative is the load threshold value that institute's measuring tape has the intelligent electric energy meter of RS485 functions.
The embodiment of the present invention also provides the failure activating system in a kind of RS485 communications, for being carried out according to said method
RS485 communication failure challenge tests, are that failure in a kind of RS485 communications provided in an embodiment of the present invention excites and is referring to Fig. 3
The structural representation of system, as shown in figure 3, the failure activating system in electric energy meter RS485 provided in an embodiment of the present invention communications, bag
Include host computer, RS485 Weight detectors and the intelligent electric energy meter and serial port service with RS485 functions being sequentially connected electrically
Device.
Specifically, host computer is used to arrange the test parameter of RS485 load capacities, sends to RS485 Weight detectors
The limit load value of the intelligent electric energy meter of the frame ordering comprising load testing value and calculating with RS485 functions；
RS485 Weight detectors are used for according to frame ordering, and control servomotor drive module drives slide rheostat, makes
The slide rheostat exports corresponding load impedance to the intelligent electric energy meter with RS485 functions；
Intelligent electric energy meter with RS485 functions, for sending meter reading data to host computer.
It is the structural representation of RS485 Weight detectors provided in an embodiment of the present invention referring to Fig. 4, as shown in figure 4,
RS485 Weight detectors include RS232 communication modules, MCU control module, servomotor drive module, adjustable resistance module
With RS485 communication modules.
Specifically, RS232 communication modules are used to carry out RS485 Weight detectors by serial server and host computer
Communication；
MCU control module is used to control the rotation direction of servomotor in servomotor drive module according to frame ordering, to
Intelligent electric energy meter with RS485 functions sends order of checking meter, and response signal is sent to into host computer；
Servomotor drive module is used to adjust the resistance value of adjustable resistance module；
Adjustable resistance module includes slide rheostat, and slide rheostat is used for adjusting resistance value, slide rheostat output
Resistance value is in RS485 communication modules the load impedance value accessed between A, B line；
RS485 communication modules are used to be led to RS485 Weight detectors and intelligent electric energy meter with RS485 functions
News.
With regard to the device in above-described embodiment, wherein modules perform the concrete mode of operation in relevant the method
Embodiment in be described in detail, explanation will be not set forth in detail herein.
As seen from the above-described embodiment, the failure exciting method in electric energy meter RS485 communications provided in an embodiment of the present invention, profit
The size of the output load impedance of RS485 Weight detectors is controlled with the Bisection Algorithms arranged in host computer, so as to
The load threshold value of the intelligent electric energy meter with RS485 functions is obtained, the efficiency high of load threshold value is obtained；RS485 load inspections
Survey device and output loading is adjusted by Serve Motor Control slide rheostat, realize stepless resistance trimming, and then make the load of acquisition
Ultimate value accuracy is high；Failure activating system in electric energy meter RS485 communications provided in an embodiment of the present invention, adjustable resistance module
For slide rheostat, ruggedness is strong.
Those skilled in the art will readily occur to its of the present invention after considering description and putting into practice disclosure of the invention here
Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and
And can without departing from the scope carry out various modifications and changes.The scope of the present invention is only limited by appended claim.
Claims (7)
1. the failure exciting method during a kind of electric energy meter RS485 communicates, it is characterised in that include：
The test parameter of RS485 load capacities is set, wherein, the test parameter includes and the intelligence electricity with RS485 functions
The test of baud rate and load impedance value that energy table is communicated is interval；
By the use of Bisection Algorithms the load impedance value in the test interval is selected as load testing value；
Frame ordering comprising the load testing value is sent to into RS485 Weight detectors, the RS485 Weight detectors
For according to the frame ordering, control servomotor drive module to drive slide rheostat, make the slide rheostat output right
The load impedance answered is sent out to the intelligent electric energy meter with RS485 functions to the intelligent electric energy meter with RS485 functions
Send order of checking meter；
According to the critical point for receiving response signal, the load threshold value of the intelligent electric energy meter with RS485 functions is obtained, its
In, the response signal includes reply data of the intelligent electric energy meter with RS485 functions to the order of checking meter.
2. failure exciting method according to claim 1, it is characterised in that the utilization Bisection Algorithms select the test
Load impedance value in interval includes as load testing value：
The interval intermediate value of the test is selected as load testing value；
Response signal of the intelligent electric energy meter with RS485 functions to order of checking meter according to receiving, selects the test section
Between threshold value and last time load testing value intermediate value as the load testing value tested again；
Response signal of the intelligent electric energy meter with RS485 functions to order of checking meter according to not receiving, before selecting twice
The intermediate value of load testing value is used as the load testing value tested again.
3. failure exciting method according to claim 1, it is characterised in that by serial server simultaneously to multiple described
RS485 Weight detectors send respectively the frame ordering.
4. failure exciting method according to claim 1, it is characterised in that the order of checking meter includes making a copy of described carrying
The date-time communication frames of the intelligent electric energy meter of RS485 functions, the response signal includes the date-time communication frames.
5. the failure activating system in a kind of electric energy meter RS485 communication, it is characterised in that including the host computer being sequentially connected electrically,
RS485 Weight detectors and the intelligent electric energy meter with RS485 functions, wherein：
The host computer, for arranging the test parameter of RS485 load capacities, sending to the RS485 Weight detectors and wrap
The limit load value of the frame ordering containing the load testing value and the calculating intelligent electric energy meter with RS485 functions；
The RS485 Weight detectors, for according to the frame ordering, control servomotor drive module to drive slip variable resistance
Device, makes the slide rheostat export corresponding load impedance to the intelligent electric energy meter with RS485 functions, to the band
The intelligent electric energy meter for having RS485 functions sends order of checking meter；
The intelligent electric energy meter with RS485 functions, for the response signal of order of checking meter described in host computer transmission.
6. failure activating system according to claim 5, it is characterised in that also including serial server, the host computer
Electrically connected with multiple RS485 Weight detectors by the serial server.
7. failure activating system according to claim 6, it is characterised in that
The RS485 Weight detectors include RS232 communication modules, MCU control module, servomotor drive module, adjustable
Resistive module and RS485 communication modules；
The RS232 communication modules are used for the RS485 Weight detectors by the serial server and described upper
Machine is communicated；
The MCU control module is used to control the rotation of servomotor in the servomotor drive module according to the frame ordering
Direction, to the intelligent electric energy meter with RS485 functions order of checking meter is sent, and the response signal is sent to described upper
Machine；
The servomotor drive module is used to adjust the resistance value of the adjustable resistance module；
The adjustable resistance module includes the slide rheostat, and the slide rheostat is used to adjust the resistance value, described
Resistance value is the load impedance value accessed between A, B line in the RS485 communication modules；
The RS485 communication modules are used for the RS485 Weight detectors and the intelligent electric energy with RS485 functions
Table is communicated.
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| CN201710007072.2A CN106685479B (en) | 2017-01-05 | 2017-01-05 | Fault excitation method and system in RS485 communication of electric energy meter |
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| CN114554310A (en) * | 2022-01-04 | 2022-05-27 | 云南电网有限责任公司 | Electric power metering sniffing system and method |
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Effective date of registration: 20210421 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: Holley Technology Co.,Ltd. |