CN112398536A - Method for preventing RS485 communication module from electromagnetic interference - Google Patents
Method for preventing RS485 communication module from electromagnetic interference Download PDFInfo
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- CN112398536A CN112398536A CN202011077086.XA CN202011077086A CN112398536A CN 112398536 A CN112398536 A CN 112398536A CN 202011077086 A CN202011077086 A CN 202011077086A CN 112398536 A CN112398536 A CN 112398536A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 155
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 230000008054 signal transmission Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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Abstract
The invention provides a method for preventing an RS485 communication module from electromagnetic interference, which comprises the RS485 communication module, a first RS485 optical transceiver, a second RS485 optical transceiver and a shielding box, wherein the RS485 communication module and the first RS485 optical transceiver are arranged in the shielding box, and the second RS485 optical transceiver is arranged outside the shielding box; the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485. The method for preventing the RS485 communication module from electromagnetic interference can not only prevent the communication module in the RS485 shielding box from electromagnetic interference, but also prevent the RS485 electrical signals from being subjected to electromagnetic interference when entering and exiting the shielding box, thereby ensuring the consistency of the RS485 electrical signals inside and outside the shielding box to the maximum extent.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for preventing an RS485 communication module from electromagnetic interference.
Background
The RS485 communication is widely applied in industry, RS485 communication signals are transmitted through cables, and under the condition of the prior art, the RS485 communication cables generally adopt common twisted pairs or RS485 special cables with matched impedance.
However, in practical application with a high-power frequency converter, RS485 communication is subject to electromagnetic interference of harmonic waves output by the frequency converter, so that RS485 communication is interrupted, and particularly, under the condition that RS485 communication is used in a controller, the electromagnetic interference causes equipment shutdown, factory production is affected, and enterprise risk is increased.
Disclosure of Invention
The invention provides a method for shielding electromagnetic interference in an RS485 communication process, in order to solve the defects in the prior art, and particularly provides a method for preventing an RS485 communication module from being interfered by electromagnetic interference in an RS485 communication process in a high-power variable-frequency controller.
The invention provides a method for preventing an RS485 communication module from electromagnetic interference, which comprises the RS485 communication module, a first RS485 optical transceiver, a second RS485 optical transceiver and a shielding box, wherein the RS485 communication module and the first RS485 optical transceiver are arranged in the shielding box, and the second RS485 optical transceiver is arranged outside the shielding box; the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485.
In the method for preventing the RS485 communication module from electromagnetic interference, the second RS485 optical transceiver converts the RS485 electrical signal outside the shielding box into an optical signal, transmits the optical signal into the first RS485 optical transceiver in the shielding box through the optical fiber jumper, and the first RS485 optical transceiver converts the optical signal back into the RS485 electrical signal and then is connected with the RS485 communication module in an RS485 manner; the RS485 communication module transmits the processed RS485 electrical signal back to the first RS485 optical transceiver, the RS485 electrical signal is converted into an optical signal, the optical signal is transmitted back to the second RS485 optical transceiver outside the shielding box, and finally the optical signal is converted into the processed RS485 electrical signal. The optical signal is not subjected to electromagnetic interference when being transmitted by the optical fiber jumper, because the frequency of the high-power frequency converter is greatly different from the frequency of the optical signal, resonance cannot be generated, and the electromagnetic interference cannot be generated. By adopting the method, the communication module in the RS485 shielding box can be prevented from being interfered by electromagnetism, the electromagnetic interference caused when the RS485 electric signal enters or exits the shielding box can also be avoided, and the consistency of the RS485 electric signal inside and outside the shielding box can be ensured to the greatest extent.
Furthermore, a controller is arranged outside the shielding box, and the second RS485 optical transceiver is connected with the controller through RS485 and controlled by the controller.
Furthermore, an external power supply is arranged outside the shielding box, a power filter, a transformer and a power socket are arranged in the shielding box, and the external power supply supplies power to the RS485 communication module and the first RS485 optical transceiver through the power filter, the transformer and the power socket. The power filter is adopted to effectively filter the frequency point of the specific frequency of the external power supply or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency, so that the external power supply cannot generate electromagnetic interference on the RS485 electric signal in the shielding box.
Particularly, a first analog quantity/digital quantity optical transceiver is arranged in the shielding box, a second analog quantity/digital quantity optical transceiver and an external control point are arranged outside the shielding box, the first analog quantity/digital quantity optical transceiver is connected with the RS485 communication module through a control line, and the first analog quantity/digital quantity optical transceiver is connected with the second analog quantity/digital quantity optical transceiver through an optical fiber jumper. The second analog quantity/digital quantity optical transmitter and receiver is connected with an external control point through a control line and controls external equipment. The external control point feeds back the signal to the second analog quantity/digital quantity optical transceiver, the second analog quantity/digital quantity optical transceiver transmits the optical signal to the first analog quantity/digital quantity optical transceiver, and the first analog quantity/digital quantity optical transceiver transmits the analog quantity control signal or the digital quantity control signal to the RS485 communication module. The analog control signal and the digital control signal are prevented from being interfered by electromagnetism in the shielding box and when entering and exiting the shielding box, and the consistency of the RS485 control signals inside and outside the shielding box is ensured to the maximum extent.
Furthermore, an external power supply is arranged outside the shielding box, a power filter, a transformer and a power socket are arranged in the shielding box, and the external power supply supplies power to the RS485 communication module, the first RS485 optical transceiver and the first analog quantity/digital quantity optical transceiver through the power filter, the transformer and the power socket.
Particularly, the first RS485 optical transceiver and the first analog/digital optical transceiver are integrated into a first dual-channel optical transceiver, and the second RS485 optical transceiver and the second analog/digital optical transceiver are integrated into a second dual-channel optical transceiver; the external power supply directly supplies power to the first dual-path optical transceiver through the power filter, the transformer and the power socket, and the first dual-path optical transceiver transmits power to the first RS485 optical transceiver and the first analog/digital optical transceiver. The RS485 optical transceiver and the analog quantity/digital quantity optical transceiver are integrated into a double-path optical transceiver, wherein one path of the double-path optical transceiver transmits communication signals of the RS485 optical transceiver, and the other path transmits control signals of the analog quantity/digital quantity optical transceiver, so that a power supply module can be reduced under the condition of not influencing signal transmission, the size of a shielding box body is reduced, and further the cost is reduced.
Furthermore, a standard guide rail for placing the RS485 communication module, a power socket and other components is arranged in the shielding box.
Drawings
Fig. 1 is a logic block diagram of a method for protecting an RS485 communication module from electromagnetic interference in the second embodiment.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection; may be directly connected, or indirectly connected through intervening media, or may be in communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first" and "second" are used primarily to distinguish between different components or elements and are not used to indicate or imply the relative importance or number of the indicated components or elements. "plurality" means two or more unless otherwise specified.
Example one
A method for preventing an RS485 communication module from electromagnetic interference comprises the RS485 communication module, a first RS485 optical transceiver, a second RS485 optical transceiver and a shielding box, wherein the RS485 communication module and the first RS485 optical transceiver are arranged in the shielding box, and the second RS485 optical transceiver is arranged outside the shielding box; an external power supply and a controller are arranged outside the shielding box, a power filter, a transformer and a power socket are also arranged in the shielding box, and the external power supply supplies power to the RS485 communication module and the first RS485 optical transceiver through the power filter, the transformer and the power socket; the second RS485 optical transceiver is connected with the controller through RS485 and controlled by the controller, the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485.
In the method for preventing the RS485 communication module from electromagnetic interference, a second RS485 optical transceiver outside the shielding box receives an RS485 electrical signal from the controller, converts the RS485 electrical signal into an optical signal, transmits the optical signal into a first RS485 optical transceiver inside the shielding box through an optical fiber jumper, converts the optical signal back into an RS485 electrical signal, and then performs RS485 connection with the RS485 communication module; the RS485 communication module transmits the processed RS485 electrical signal back to the first RS485 optical transceiver, the RS485 electrical signal is converted into an optical signal, the optical signal is transmitted back to the second RS485 optical transceiver outside the shielding box, and finally the optical signal is converted into the processed RS485 electrical signal. The optical signal is not subjected to electromagnetic interference when being transmitted by the optical fiber jumper, because the frequency of the high-power frequency converter is greatly different from the frequency of the optical signal, resonance cannot be generated, and the electromagnetic interference cannot be generated. By adopting the method, the communication module in the RS485 shielding box is prevented from being interfered by electromagnetism, and meanwhile, the electromagnetic interference caused when the RS485 electric signal enters or exits the shielding box is also avoided, and the consistency of the RS485 electric signal inside and outside the shielding box is ensured to the greatest extent. Moreover, the power filter is adopted to effectively filter the frequency point of the specific frequency of the external power supply or the frequency except the frequency point, so that the power signal of the specific frequency of the high-power frequency converter is eliminated, and the external power supply cannot generate electromagnetic interference on the RS485 electric signal in the shielding box.
Example two
A method for preventing an RS485 communication module from electromagnetic interference comprises the RS485 communication module, a first RS485 optical transceiver, a second RS485 optical transceiver, a first analog quantity/digital quantity optical transceiver, a second analog quantity/digital quantity optical transceiver and a shielding box, wherein the RS485 communication module, the first RS485 optical transceiver and the first analog quantity/digital quantity optical transceiver are arranged in the shielding box, and the second RS485 optical transceiver and the second analog quantity/digital quantity optical transceiver are arranged outside the shielding box.
A controller and an external control point are arranged outside the shielding box, the second RS485 optical transceiver is connected with the controller through RS485 and controlled by the controller, the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485; the second analog quantity/digital quantity optical transmitter and receiver is connected with an external control point through a control line and controls external equipment; the external control point feeds back the signal to the second analog quantity/digital quantity optical transceiver, the second analog quantity/digital quantity optical transceiver transmits the optical signal to the first analog quantity/digital quantity optical transceiver, and the first analog quantity/digital quantity optical transceiver transmits the analog quantity control signal or the digital quantity control signal to the RS485 communication module.
An external power supply is further arranged outside the shielding box, a power filter, a transformer and a power socket are further arranged in the shielding box, and the external power supply supplies power to the RS485 communication module, the first RS485 optical transceiver and the first analog quantity/digital quantity optical transceiver through the power filter, the transformer and the power socket.
Compared with the method of the first embodiment, the method for preventing the RS485 communication module from electromagnetic interference of the first embodiment has the following characteristics: (1) the method for preventing the RS485 communication module from electromagnetic interference can simultaneously carry out electromagnetic shielding on the RS485 communication electric signal and the analog quantity/digital quantity control signal transmitted by the RS485 communication module in the shielding box; (2) the analog quantity control signal or the digital quantity control signal is free from electromagnetic interference when entering and exiting the shielding box, and the consistency of the RS485 control signals inside and outside the shielding box is ensured to the greatest extent.
EXAMPLE III
A method for preventing an RS485 communication module from electromagnetic interference comprises the RS485 communication module, a first dual-path optical transmitter and receiver, a second dual-path optical transmitter and receiver and a shielding box, wherein the RS485 communication module and the first dual-path optical transmitter and receiver are arranged in the shielding box, the second dual-path optical transmitter and receiver is arranged outside the shielding box, the first dual-path optical transmitter and receiver comprises a first RS485 optical transmitter and receiver and a first analog quantity/digital quantity optical transmitter and receiver, and the second dual-path optical transmitter and receiver comprises a second RS485 optical transmitter and receiver.
A controller and an external control point are arranged outside the shielding box, the second RS485 optical transceiver is connected with the controller through RS485 and controlled by the controller, the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485; the second analog quantity/digital quantity optical transmitter and receiver is connected with an external control point through a control line and controls external equipment; the external control point feeds back the signal to the second analog quantity/digital quantity optical transceiver, the second analog quantity/digital quantity optical transceiver transmits the optical signal to the first analog quantity/digital quantity optical transceiver, and the first analog quantity/digital quantity optical transceiver transmits the analog quantity control signal or the digital quantity control signal to the RS485 communication module.
An external power supply is further arranged outside the shielding box, a power filter, a transformer and a power socket are further arranged in the shielding box, the external power supply supplies power to the RS485 communication module and the first dual-path optical transceiver through the power filter, the transformer and the power socket, and the first dual-path optical transceiver transmits power to the first RS485 optical transceiver and the first analog quantity/digital quantity optical transceiver.
Compared with the method of the second embodiment, the method for preventing the RS485 communication module from electromagnetic interference of the second embodiment has the following characteristics: in the embodiment, the RS485 optical transceiver and the analog/digital optical transceiver are integrated into the dual-channel optical transceiver, wherein one channel of the dual-channel optical transceiver transmits the communication signal of the RS485 optical transceiver, and the other channel transmits the control signal of the analog/digital optical transceiver, so that a power supply module can be reduced without affecting signal transmission, the size of the shielding box is reduced, and further the cost is reduced.
The foregoing has described preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary, and various changes made within the scope of the independent claims of the present invention are within the scope of the present invention.
Claims (7)
1. A method for preventing an RS485 communication module from electromagnetic interference comprises the RS485 communication module, a first RS485 optical transceiver, a second RS485 optical transceiver and a shielding box, and is characterized in that the RS485 communication module and the first RS485 optical transceiver are arranged in the shielding box, and the second RS485 optical transceiver is arranged outside the shielding box; the second RS485 optical transceiver is connected with the first RS485 optical transceiver through an optical fiber jumper, and the first RS485 optical transceiver is connected with the RS485 communication module through RS 485.
2. The method of claim 1, wherein an external power source is provided outside the shielding box, a power filter, a transformer and a power socket are provided inside the shielding box, and the external power source supplies power to the RS485 communication module and the first RS485 optical transceiver through the power filter, the transformer and the power socket.
3. The method of claim 1, wherein a controller is disposed outside the shielding box, and the second RS485 optical transceiver is connected to the controller via RS485 and controlled by the controller.
4. The method of claim 1, wherein a first A/D optical transceiver is disposed inside the shield box, a second A/D optical transceiver is disposed outside the shield box, the first A/D optical transceiver is connected to the RS485 communication module via a control line, and the first A/D optical transceiver is connected to the second A/D optical transceiver via an optical fiber jumper.
5. The method of claim 4, wherein an external power source is provided outside the shielding box, a power filter, a transformer and a power socket are provided inside the shielding box, and the external power source supplies power to the RS485 communication module, the first RS485 optical transceiver and the first analog/digital optical transceiver through the power filter, the transformer and the power socket.
6. The method of claim 5, wherein the first RS485 optical transceiver and the first analog/digital optical transceiver are integrated into a first dual-channel optical transceiver, and the second RS485 optical transceiver and the second analog/digital optical transceiver are integrated into a second dual-channel optical transceiver; the external power supply directly supplies power to the first dual-path optical transceiver through the power filter, the transformer and the power socket, and the first dual-path optical transceiver transmits power to the first RS485 optical transceiver and the first analog/digital optical transceiver.
7. The method as claimed in claim 4, wherein an external control point is provided outside the shield box, and the second analog/digital optical transceiver is connected to the external control point via a control line and controls an external device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011077086.XA CN112398536A (en) | 2020-10-10 | 2020-10-10 | Method for preventing RS485 communication module from electromagnetic interference |
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| CN202011077086.XA CN112398536A (en) | 2020-10-10 | 2020-10-10 | Method for preventing RS485 communication module from electromagnetic interference |
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2020
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565410U (en) * | 2012-05-17 | 2012-11-28 | 吴琦 | Plastic optical fiber type video transceiver |
| CN102955470A (en) * | 2012-11-07 | 2013-03-06 | 浙江吉利汽车研究院有限公司杭州分公司 | Monitoring system, control host and monitoring method for radiation anti-interference test |
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| CN106253984A (en) * | 2016-07-28 | 2016-12-21 | 长沙威胜信息技术有限公司 | Optical fiber RS485 chromacoder |
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Application publication date: 20210223 |