CN209927938U - Detection device of M-Bus signal instrument under intentional radiation interference - Google Patents
Detection device of M-Bus signal instrument under intentional radiation interference Download PDFInfo
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- CN209927938U CN209927938U CN201920426143.7U CN201920426143U CN209927938U CN 209927938 U CN209927938 U CN 209927938U CN 201920426143 U CN201920426143 U CN 201920426143U CN 209927938 U CN209927938 U CN 209927938U
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Abstract
The utility model relates to a signal instrument quality testing field specifically is a detection device of M-Bus signal instrument under intentional radiation interference. The technical problem of how to accurately detect when the M-Bus instrument applies intentional interference is solved. The device comprises a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to the M-Bus signal instrument to be detected, the signal detection module is used for converting an RS-232/485 signal and an M-Bus signal, and the radiation interference module comprises a signal converter and a shielding box, wherein the signal converter is used for connecting the M-Bus signal instrument to be detected and the control module, and the shielding box is used for shielding the interference of the electromagnetic waves to the signal converter. The utility model provides a technique that reliability and accuracy of test environment can be guaranteed to M-Bus signal under the interference of intentionally. The utility model discloses utilize the electromagnetic shielding technique, to a great extent the elimination is surveyed the disturbed problem of instrument communication line, can accurately carry out the fault diagnosis of M-Bus signal instrument according to experimental intention.
Description
Technical Field
The utility model relates to an instrument and meter quality testing field specifically is a detection device of M-Bus signal instrument under intentional radiation interference.
Background
The drawback of the data acquisition mode which seems economic in daily life is increasingly exposed, the meter reading workload is large, and the inevitable error reading is frequent, which undoubtedly brings unnecessary troubles to users. The modern communication mode is adopted for centralized meter reading, and timely and accurate metering data can be obtained without going out of home. The M-Bus is a field Bus developed for meeting the requirements of networking and remote meter reading of various measuring instruments, can be used for automatic meter reading of water meters, electric meters, gas meters, heat meters and other instruments, is widely applied to the field of intelligent measuring instruments at present, and becomes the European standard. In China, the method is currently incorporated into the industry standard by the national ministry of construction.
However, in modern society, with the development of industry and information industry, electromagnetic noise is enriched in the surrounding environment, and for an M-Bus meter, in a strong electromagnetic radiation environment, whether M-Bus signal communication is normal or not is one of important indexes for judging that the meter can work normally, so that a special test site and environment need to be provided for verifying the M-Bus meter. The standard test procedure is generally required to be carried out in a semi-anechoic chamber, and intentional electromagnetic waves which meet the test requirements and are generated in the anechoic chamber can interfere with the M-Bus instrument, so that when the radio frequency electromagnetic field radiation immunity test is carried out on the tested equipment, the input and output signals of the equipment need to be monitored and analyzed in real time, and the influence degree of the intentional interference on the equipment and a signal transmission medium needs to be distinguished by necessary means.
At present, for a device to be tested with an M-Bus communication line, a coupling path of intentional interference is usually added, a lead of an M-Bus signal instrument is led out of a radio wave darkroom, however, the addition of the lead may lead part of high-frequency radiation out of the darkroom to generate radiation for workers, and meanwhile, due to the fact that the length of the lead is increased, the physical structure of the device is strictly changed, and therefore the test condition cannot be well met. Therefore, there is a need for an apparatus and method for accurately detecting an M-Bus meter under electromagnetic interference.
Disclosure of Invention
The utility model provides a detection apparatus for M-Bus instrument is under intentional radiation interference mainly solves following problem:
(1) when the M-Bus instrument applies intentional interference, namely when the simulation instrument works in a real electromagnetic interference working environment, a method for monitoring whether the instrument can work normally on line needs to be provided.
(2) When the communication line of the M-Bus instrument is subjected to intentional interference, the transmission of normal communication signals can be influenced, so that a certain method needs to be adopted, the influence of the intentional interference on a communication medium is eliminated, and the real response condition of the tested equipment is restored.
The utility model discloses a detection apparatus of M-Bus instrument under intentional radiation interference adopts following technical scheme to realize: a detection device of an M-Bus signal instrument under intentional radiation interference comprises a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to the M-Bus signal instrument to be detected, the signal detection module is used for converting an RS-232/485 signal and an M-Bus signal, and the radiation interference module comprises a signal converter and a shielding box, wherein the signal converter is used for connecting the M-Bus signal instrument to be detected and the control module, and the shielding box is used for shielding the interference of the electromagnetic waves to the signal converter.
The device of the utility model sends a corresponding signal instruction to the M-Bus signal instrument to be detected through the signal monitoring module, and simultaneously receives the signal fed back by the instrument and inputs the signal to the control module; the radiation interference module is used for simulating an external interference electromagnetic field and adjusting the field intensity of the interference electromagnetic field under the control of the control module so as to better simulate different electromagnetic interference environments; the shielding box is used for protecting the signal converter from being interfered by an electromagnetic field emitted by the radiation interference module so as to ensure that the signal sent by the instrument to be detected can be accurately received under the condition of electromagnetic interference so as to ensure the accuracy of a detection result.
Furthermore, the signal converter comprises a first part and a second part which are connected through an optical fiber, the first part is connected with the control module, the second part is connected with the M-Bus signal instrument to be detected, and the second part is placed in the shielding box; the first part is used for realizing the conversion of the RS-232/485 signal and the optical signal, and the second part is used for realizing the conversion of the optical signal and the M-Bus signal; the radiation interference module comprises a signal source, a power amplifier group, an antenna group and a directional coupler which are cascaded, and the signal source is controlled by the control module; the control module adopts an industrial personal computer.
The uplink direction of the first part of the signal converter is to convert the data received from the RS232 interface and then transmit the data to the transmitting end of the optical fiber interface circuit through the driving circuit, the data is firstly converted into an optical signal at the transmitting end, the physical connection of the optical signal is an optical fiber, and the transmission on the optical fiber is based on an optical pulse communication mode and is transmitted to the second part of the signal converter; the downlink direction of the first part is that the receiving end of the optical fiber interface restores the received signal into an electric signal by the optical detector, and the electric signal is converted by the conversion circuit and transmitted to the RS-232/485 interface circuit to be sent to the upper PC. Therefore, the first part of the signal converter is connected with an RS232 interface of the industrial personal computer. The second part of the signal converter is similar to the first part, and the optical transmitter and the optical receiver are used for transmitting, receiving and debugging the optical signal data, except that the optical signal is converted into an M-Bus signal.
Furthermore, the system also comprises a video acquisition control module; the video acquisition control module comprises a camera, a remote controller, a tripod and a wall frame; with the Cam8 camera and the Con4102 remote controller of PONTIS, germany, the camera Cam8 can withstand a field strength of 200V/m. Can be remotely controlled by a remote controller to adjust the angle and the focal distance.
The video acquisition control module is responsible for the video signal acquisition of the camera, the video signal is displayed in software and automatically recorded in a computer hard disk after being acquired, and in addition, the module can also carry out angle control and focal length adjustment.
A detection method of an M-Bus signal instrument under intentional radiation interference is realized by adopting a detection device of the M-Bus signal instrument under the intentional radiation interference, and comprises the following steps:
(1) placing an M-Bus signal instrument to be detected in a semi-anechoic chamber, wherein an antenna group, a shielding box and a camera are all positioned in the semi-anechoic chamber;
(2) inputting a meter number of an M-Bus instrument to be detected on an interface of an industrial personal computer, generating a serial port reading data command string according to the rule of 'technical conditions for data transmission of household metering instruments' of an industry standard CJ/T188, adding check sum bytes, and configuring serial port numbers, baud rates and frame format parameters at the same time;
(3) setting a required field intensity through an industrial personal computer, and transmitting interference electromagnetic waves with the set field intensity to an M-Bus signal instrument to be detected through an antenna;
(4) at the moment, the test starts from the appointed frequency point frequency, the industrial personal computer automatically sends a data reading command character string, the M-Bus signal instrument receives the character string and then carries out accumulation and verification, whether the character string is normally established or not is judged, and a result character string is returned;
(5) the method comprises the following steps that an industrial personal computer receives a character string output by an M-Bus instrument to be detected, the character string is analyzed to obtain a specific numerical value, built-in software of the industrial personal computer automatically draws a curve graph with frequency as a horizontal coordinate and the numerical value of a measured physical quantity of the M-Bus instrument as a vertical coordinate;
(6) judging whether the current test frequency point is finished, if not, returning to the step (3) and continuously detecting the next frequency point; and exiting the test after all the frequency points are tested, and judging the experimental result by combining the curve graph.
By adopting the method, the state of the instrument to be detected can be accurately detected under the set field intensity, and the accuracy of the detection result is ensured.
Furthermore, in the test process, the direction and the focal length of the camera can be adjusted by using a remote controller, the measured M-Bus signal instrument is aligned for auxiliary monitoring, if the M-Bus signal instrument has the phenomena of screen flashing and screen blacking, the phenomenon can be directly observed, and the judgment of the test result can be facilitated by combining the curve diagram in the step (5).
The utility model discloses beneficial effect: (1) the utility model provides a M-Bus signal is under the interference of intention to the reliability of testing environment and the scheme of accuracy are guaranteed to true simulation equipment under test's operational environment.
(2) The utility model discloses utilized electromagnetic shield technique, at to a great extent the elimination by the disturbed problem of survey instrument communication line, can accurately carry out the fault diagnosis of M-Bus signal instrument according to experimental intention.
(3) The utility model discloses can the automatic recording detection data with generate the report, realize full automated inspection and judge, be favorable to realizing comprehensive technological integration and quality management.
Drawings
Fig. 1 is a structural diagram of a signal monitoring module, where Tx indicates fiber interface data transmission and Rx indicates fiber interface data reception.
Fig. 2 is a schematic diagram of this device.
Fig. 3 is a diagram showing an actual configuration of the apparatus.
Fig. 4 is a monitoring flow chart of the M-Bus signal meter (water meter).
FIG. 5 is a graph showing the test results of the M-Bus signal meter (water meter).
1-a signal monitoring module, 2-a radiation interference module, 3-a control module, 4-M-Bus signal instruments, 5-a video acquisition control module, 6-a semi-anechoic chamber and 7-a control chamber;
11-shielding box, 21-antenna, 51-camera.
Detailed Description
The device mainly divide into four big modules: the device comprises a video acquisition control module 5, a signal monitoring module 1, a radiation interference module 2 and a control module 3. The control module is a control unit based on a PC (personal computer), and an industrial personal computer is actually used and mainly used for software control and information interaction; the radiation interference module is formed by cascading equipment such as a signal source, a field intensity probe, a radio frequency switch, an antenna group, a power amplifier group, a directional coupler and the like; the video acquisition control module is divided into two shielding cameras and a remote controller and is mainly responsible for acquiring video signals of the cameras, the video signals are displayed in software after being acquired, videos are stored in a computer hard disk, and in addition, the module can also carry out angle control and focal length adjustment; the signal monitoring module comprises a signal converter and a shielding box 11, as shown in fig. 1, which protects the second part of the signal converter from intentional interference.
The signal converter mainly realizes the function of converting RS-232/485 signals into M-Bus signals and comprises two parts, wherein the first part is used for realizing the conversion of RS-232/485 signals and optical signals, and the first part firstly converts serial port signals into TTL levels and then converts the signals into optical signals through a driving circuit for transmission. The module is a serial port-to-optical fiber module with the model of UT-277SM, and supports the transmission of two data signals: the data transmission control circuit of RS-232/485 is provided, zero delay conversion time, all serial ports are wiring terminal connections, optical fibers are connected through two ST interfaces, and the data transmission directions of the two optical fibers are opposite.
The second part is used for realizing the conversion between the optical signal and the M-BUS signal, the optical signal is converted into TTL level by the second part, and the TTL level is converted into the M-BUS signal by the conversion circuit. The module used is an optical fiber to M-Bus module, which also supports the transmission of two data signals: sending data and receiving data, and simultaneously transmitting the data with zero delay conversion time. The M-Bus signals are connected by adopting a binding post, and the supporting voltage difference is 36V +/-3% of direct current. The connection of the optical fibers also adopts two ST interfaces, and the data transmission directions of the two optical fibers are opposite.
The actual test configuration is shown in fig. 3, the M-Bus is placed in a half anechoic chamber during the test of the meter to be tested, and other control and auxiliary equipment are placed in a control chamber. The radiation system generates a certain frequency signal through a signal source, the signal is amplified through a power amplifier and output to an antenna through a coaxial cable, the signal is applied to an M-Bus signal instrument through generating field intensity meeting the test requirement, the M-Bus signal measured instrument is connected to an industrial personal computer through a signal converter, the second part of the signal converter is arranged in a shielding box, and a camera is used as another monitoring means to check the influence of the measured instrument in a test through an image mode. The shielding box is made of aluminum materials, wave-absorbing materials are arranged in the shielding box, the optical fiber interface is an ST interface, the external ST interface is connected with the first part of the signal converter, and the internal ST interface is connected with the second part of the signal converter.
The frequency range of the device is 26MHz ~ 6GHz, the field intensity range is less than or equal to 30V/m, 75% of the field intensity of the uniform field in a specified region meets the 0dB ~ 6dB range, a calibrated field intensity calibration table is stored in software, and the calibration table comprises the signal source output level, the forward power of the antenna and the field intensity information.
At the start of the test, the test procedure is completed according to the flow chart of fig. 4. The water meter will be described as example 1.
Firstly, inputting a meter number of an M-Bus water meter on a software interface, generating a serial port reading data command string according to the rule of 'technical conditions for data transmission of household metering instruments' of an industry standard CJ/T188, adding check sum bytes, and configuring parameters such as a serial port number, a baud rate and a frame format.
And adding a test template, wherein hardware equipment is sequentially mirrored into software in the test template, the hardware equipment is combined and configured according to the frequency and power range, and effective links are established between the equipment through a radio frequency change-over switch unit.
Setting required field intensity, automatically calling a calibration table by software, calculating the output level of a signal source according to a built-in formula of the software, outputting the power amplifier with 100% gain, and establishing the required field intensity.
At the moment, the test starts from the appointed frequency point frequency, the industrial personal computer automatically sends a data reading command character string, the water meter receives the character string and then carries out accumulation and verification, whether the normal establishment is established or not is judged, and a result character string is returned.
The industrial personal computer receives the character strings and analyzes the character strings to obtain specific numerical values, the software automatically draws a curve graph with the frequency as a horizontal coordinate and the current accumulated flow of the water meter as a vertical coordinate, and the curve graph is shown in fig. 5.
And judging whether the test frequency point is finished, if not, returning to the step 5 (taking the frequency of the next frequency point to be detected), and continuously detecting the next frequency point. And exiting the test after all the frequency points are tested. In the test process, the direction and the focal length of the camera can be adjusted by using the remote controller, the measured M-Bus signal instrument is aligned for auxiliary monitoring, if the M-Bus signal instrument has the phenomena of screen flashing, screen blacking and the like, the phenomena can be directly observed, and the judgment of the test result can be facilitated by combining a curve diagram.
Claims (5)
1. The device for detecting the M-Bus signal instrument under the intentional radiation interference is characterized by comprising a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to the M-Bus signal instrument to be detected, the signal monitoring module is used for converting an RS-232/485 signal and an M-Bus signal, and the radiation interference module comprises a signal converter and a shielding box, wherein the signal converter is used for connecting the M-Bus signal instrument to be detected and the control module, and the shielding box is used for shielding the interference of the electromagnetic waves to the signal converter.
2. The apparatus for detecting the presence of intentional radiation interference on an M-Bus signal meter as claimed in claim 1, wherein the signal converter comprises a first portion and a second portion connected by an optical fiber, the first portion is connected to the control module, the second portion is connected to the M-Bus signal meter to be detected, and the second portion is placed in the shielding box; the first part is used for realizing the conversion of the RS-232/485 signal and the optical signal, and the second part is used for realizing the conversion of the optical signal and the M-Bus signal; the radiation interference module comprises a signal source, a field intensity probe, a radio frequency switch, an antenna group, a power amplifier group and a directional coupler which are cascaded, and the signal source is controlled by the control module; the control module adopts an industrial personal computer.
3. The apparatus for detecting the presence of intentional radiation interference in an M-Bus signal meter as claimed in claim 2, wherein the shielding box is made of aluminum material and is filled with wave-absorbing material, the shielding box is provided with an ST interface as an optical fiber interface, and the ST interface includes an internal ST interface and an external ST interface; the external ST interface is connected with the first part of the signal converter, and the internal ST interface is connected with the second part of the signal converter; the shielding box is provided with an interface for connecting an M-Bus signal, is connected through two-wire wiring terminals and does not have polarity.
4. The apparatus for detecting the presence of intentional radiation interference in an M-Bus signal meter as set forth in claim 2 or 3, further comprising a video acquisition control module; the video acquisition control module comprises a camera and a remote controller, wherein the camera is used for observing the dynamic state of a display screen of the M-Bus signal instrument; the camera is remotely controlled through a remote controller to adjust the angle and the focal length.
5. The apparatus for detecting the presence of intentional radiation interference on an M-Bus signal instrument as set forth in claim 4, wherein the M-Bus signal instrument to be detected, the antenna group, the shielding box and the camera are all located in a half-anechoic chamber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991480A (en) * | 2019-04-01 | 2019-07-09 | 山西省计量科学研究院 | Detection device and method of the M-Bus signal instrument under Intended radiation interference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991480A (en) * | 2019-04-01 | 2019-07-09 | 山西省计量科学研究院 | Detection device and method of the M-Bus signal instrument under Intended radiation interference |
| CN109991480B (en) * | 2019-04-01 | 2024-04-05 | 山西省计量科学研究院 | Detection device and method of M-Bus signal instrument under intentional radiation interference |
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