CN208820756U - A kind of RS485 communication isolation circuit - Google Patents
A kind of RS485 communication isolation circuit Download PDFInfo
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- CN208820756U CN208820756U CN201821276889.6U CN201821276889U CN208820756U CN 208820756 U CN208820756 U CN 208820756U CN 201821276889 U CN201821276889 U CN 201821276889U CN 208820756 U CN208820756 U CN 208820756U
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- 238000002955 isolation Methods 0.000 title claims abstract description 74
- 238000004891 communication Methods 0.000 title claims abstract description 34
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 claims abstract description 24
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 claims abstract description 20
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 claims abstract description 20
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 67
- 230000005611 electricity Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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Abstract
A kind of RS485 communication isolation circuit, including power isolation module and signal isolation module, two input terminal VCC1/GND1 of power isolation module U1 described in power isolation module U1 are for accessing supply voltage, two output end VCC2/GND2 are used to provide supply voltage for the RS485 communication chip and signal isolation module of rear end, the RS485 communication chip power end VCC1/GND1 accesses supply voltage end, and signal end is connected to the front end signal end of signal isolation module；Wherein, the front end power end VCC1/GND1 of the signal isolation module accesses supply voltage end, the output end VCC2/GND2 of rear end power end access power isolation module, front end signal terminates the signal end into RS485 communication module, signal A is terminated into first resistor R1, the first resistor R1 other end accesses isolated power supply module output end VCC2, signal B is terminated into second resistance R2, the second resistance R2 other end accesses the end power isolation module output ground GND2, transmission rate and common mode interference anti-interference ability can be improved in this utility structure, reduces the complexity of software design.
Description
Technical field
Originally practical to be related to a kind of RS485 communication isolation circuit.
Background technique
With the development of science and technology, power communication, the fields such as intelligence instrument are all to use under normal conditions in Industry Control
The mode of serial communication carries out data exchange.The mode of original adoption is RS232 interface, but since industrial environment is more multiple
Miscellaneous, various electrical equipments can generate many electromagnetic interferences, will lead to signal transmission errors, and in addition to this, RS232 interface can only
It realizes point-to-point communication, does not have network savvy, maximum transmission distance yet can not only be able to satisfy telecommunication and want up to tens meters
It asks, and RS485 then solves these problems, data-signal uses differential transfer mode, can be asked with effective solution common mode interference
Topic, maximum distance can be to 1200 meters, and multiple transceivers is allowed to be connected in same bus.
American Electronics Industry Association (full name in English: Flectronic Industries Association, referred to as: EIS)
It formulates and the RS485 standard interface issued has become preferred standard in industrial application.RS485 standard interface its standardized hair
The electrical characteristic for sending device and receiver, is sent using balanced type, and the data collector of differential received drives bus.With transmission
It is at low cost, the characteristics of transmission range is long, strong antijamming capability.But in actual use, since industrial environment is sufficiently complex, especially
Stronger interference can be generated to signal by nearby having when high voltage, powerful equipment, and frequent starting cause signal to transmit
Mistake.For state of a control failure, data skew, program runs situations such as out of control, and people, which take several steps, to be isolated, than
It if Phototube Coupling is exactly one of which, is realized using three optocouplers, an optocoupler is used for the RO pin of isolation RS 485, further
A optocoupler is used for RF the and DE pin of isolation RS 485, the last one optocoupler is used for the DI pin of isolation RS 485.
Utility model content
In order to solve the above technical problems, this it is practical a kind of RS485 communication isolation circuit is provided, including power isolation module and
Signal isolation module, wherein two input terminal VCC1/GND1 of power isolation module U1 described in power isolation module U1 are for connecing
Enter supply voltage, two output end VCC2/GND2 are used to provide confession for the RS485 communication chip and signal isolation module of rear end
Piezoelectric voltage, the RS485 communication module power end VCCl/GND1 access supply voltage end, and signal end RO/RE/DE/DI is connected to
The end front end signal RO/RF/DE/DI of signal isolation module；Wherein, the front end power end VCC1/ of the signal isolation module
GND1 accesses supply voltage end, and rear end power end accesses the output end VCC2/GND2, front end signal end RO/ of power isolation module
RF/DE/DI accesses the RO/RF/DE/DI signal end of RS485 communication module, and rear end A end signal is connected to first resistor R1, the first electricity
It hinders the R1 other end and accesses isolated power supply module output end VCC2, rear end B end signal accesses second resistance R2, and second resistance R2 is another
It terminates into the end power isolation module output ground GND2.
Further, the power isolation module further includes first capacitor C1, the second capacitor C2, third capacitor C3, and the 4th
Capacitor C4.The first capacitor C1 and the second capacitor C2 parallel connection are followed by the input terminal VCC1/GND1 in power isolation module, described
Third capacitor C3 and the 4th capacitor C4 parallel connection are followed by power isolation module output end VCC2/GND2.
Further, the power supply front and back end of the power end of RS485 communication chip and signal isolation unit increases separately the 5th
Capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the power end of the mono- end Jie RS485 communication chip of the 5th capacitor C5
VCC1, another ground terminal GND1 for terminating at RS485 communication chip, before the mono- end Jie signal isolation module of the 6th capacitor C6
Feeder ear VCC1 is held, it is another to terminate at front-end power end ground terminal GND1, the mono- end Jie signal isolation module of the 7th capacitor C7
The power supply side VCC2 of rear end, it is another to terminate at rear end power supply side GND2.
It further, further include 3rd resistor R3, the 8th capacitor C8, the 9th capacitor C9, diode D1, the 8th capacitor
C8 and the 9th capacitor C9 is filter capacitor, is connect respectively between the signal side a and b of signal isolation module after being together in series, the
The tie point of eight capacitors and the 9th capacitor meets rear end ground terminal GND2, and the 3rd resistor R3 is build-out resistor, be connected in parallel on signal every
Between the end signal A from module and the end B, for eliminating common mode interference, the anode of diode D1 terminates GND2, and cathode terminal connects respectively
To the end signal A and the end signal B
The utility model has the advantages that in novel RS485 telecommunication circuit disclosed by the utility model, using power isolation module feeder ear
Isolation, to avoid interfering with each other for front and back end power supply ripple.The front and back end of signal is isolated using signal isolation module, then
Inhibit spike using the Transient Suppression Diode between the signal end of connection external equipment, improves the anti-interference energy of circuit
Power.Compared to now traditional Phototube Coupling scheme, this scheme substantially increases the anti-interference ability of circuit and reduces data
Output delay, transmission rate is faster, more quasi-, and transmission range is longer.And circuit volume is smaller, and cost is lower, uses soft
Part design is also relatively simple.
The utility model RS485 communication isolation circuit, which is compared, not only can be reduced circuit occupancy with traditional Phototube Coupling mode
Space, can also improve traffic rate, improve anti-interference ability and isolation stress levels, reduce the complexity of software design, always
Body cost will also be substantially reduced compared to common optical coupler isolation scheme, coped with poor industrial environment ability and be remarkably reinforced.
Detailed description of the invention
Fig. 1 is the first embodiment circuit structure diagram of the utility model；
Fig. 2 is second of embodiment circuit structure diagram of the utility model.
Specific embodiment
Below in conjunction with the attached drawing in this practical embodiment, to this it is practical in technical solution clearly and completely retouched
It states, it is clear that described embodiment is only this practical a part of the embodiment, instead of all the embodiments.In practical
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to the range of this practical protection.
Embodiment one:
The utility model provides a kind of RS485 communication isolation circuit, including power isolation module and signal isolation module.
Wherein, two input terminal VCC1/GND1 of power isolation module U1 described in power isolation module U1 are supplied for accessing
Piezoelectric voltage, two output end VCC2/GND2 are used to provide power supply electricity for the RS485 communication chip and signal isolation module of rear end
Pressure, the RS485 communication module power end access VCC1/GND1 supply voltage end, signal end RO/RE/DE/DI be connected to signal every
The end front end signal RO/RE/DE/DI from module.
Wherein, the front end power end of the signal isolation module accesses VCC1/GND1 supply voltage end, rear end power supply termination
Enter the output end VCC2/GND2 of power isolation module, front end signal end RO/RE/DE/DI accesses the R0/ of RS485 communication module
RE/DE/DI signal end, rear end A end signal are connected to first resistor R1, and the first resistor R1 other end accesses the output of isolated power supply module
VCC2 is held, rear end B end signal accesses second resistance R2, and the second resistance R2 other end accesses power isolation module output ground GND2
End.
Embodiment two:
The present embodiment is further improvement on that basis of example 1, as shown in Fig. 2, the power isolation module is also
Including first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4.The first capacitor C1 and the second capacitor C2 are simultaneously
Connection is followed by being followed by the input terminal VCC1/GND1, the third capacitor C3 of power isolation module and the 4th capacitor C4 parallel connection in electricity
Source isolation module output end VCC2/GND2.
The first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4 of the power isolation module be in order to
Filter out the ripple interference of power isolation module front and back end, steady voltage.
For further burning voltage, before and after the power end of RS485 communication chip and the power supply of signal isolation unit
End increases separately the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7.5th capacitor C5, the mono- end Jie RS485 communicates core
The power end VCC1, another ground terminal GND1 for terminating at RS485 communication chip of piece.6th capacitor C6, the mono- end Jie signal
The front-end power end VCC1 of isolation module, it is another to terminate at front-end power end ground terminal GND1.7th capacitor C7, the mono- end Jie
The power supply side VCC2 of signal isolation module rear end, it is another to terminate at rear end power supply side GND2.
In order to further enhance anti-interference when signal transmission, and 3rd resistor R3 is increased, the 8th capacitor C8, the 9th
Capacitor C9, diode D1.The 8th capacitor C8 and the 9th capacitor C9 be filter capacitor, connect respectively after being together in series signal every
Between signal side a and b from module, the tie point of the 8th capacitor and the 9th capacitor connects rear end ground terminal GND2, the third electricity
Resistance R3 is build-out resistor, is connected in parallel between the end signal A of signal isolation module and the end B, for eliminating common mode interference.Transient state inhibits
The anode of diode D1 terminates GND2, and cathode terminal is coupled with the end signal A and the end signal B.
While there has been shown and described that this practical embodiment for the ordinary skill in the art can be with
Understand these examples can be carried out in the case where not departing from this practical principle and spirit a variety of variations, modification, replacement and
Modification, this practical range are defined by the appended claims and the equivalents thereof.
Claims (4)
1. a kind of RS485 communication isolation circuit, including power isolation module and signal isolation module, it is characterised in that: wherein, institute
Two input terminal VCC1/GND1 of power isolation module U1 are stated for accessing supply voltage, two output end VCC2/GND2 are used for
Supply voltage, the RS485 communication chip power end VCC1/ are provided for the RS485 communication chip and signal isolation module of rear end
GND1 accesses supply voltage end, and signal end RO/RE/DE/DI is connected to the end front end signal RO/RE/DE/DI of signal isolation module；
Wherein, the signal isolation module front end power end VCC1/GND1 access supply voltage end, rear end power end access power supply every
Output end VCC2/GND2 from module, front end signal end RO/RE/DE/DI access the RO/RE/DE/DI letter of RS485 communication module
Number end, signal A are terminated into first resistor R1, and the first resistor R1 other end accesses isolated power supply module output end VCC2, the end signal B
Second resistance R2 is accessed, the second resistance R2 other end accesses the end power isolation module output ground GND2.
2. RS485 communication isolation circuit according to claim 1, it is characterised in that: the power isolation module further includes
One capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the first capacitor C1 and the second capacitor C2 parallel connection are followed by
It is followed by the input terminal VCC1/GND1, the third capacitor C3 of power isolation module and the 4th capacitor C4 parallel connection in isolated from power
Module output end VCC2/GND2.
3. RS485 communication isolation circuit according to claim 1, it is characterised in that: the power end and letter of RS485 communication chip
The power supply front and back end of number isolated location increases separately the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 5th capacitor C5
The power end VCC1 of one end Jie RS485 communication chip, another ground terminal GND1 for terminating at RS485 communication chip, the described 6th
The front-end power end VCC1 of mono- end Jie signal isolation module of capacitor C6, it is another to terminate at front-end power end ground terminal GND1, it is described
The power supply side VCC2 of the mono- end Jie signal isolation module rear end 7th capacitor C7, it is another to terminate at rear end power supply side
GND2。
4. RS485 communication isolation circuit according to claim 1, it is characterised in that: further include 3rd resistor R3, the 8th capacitor
C8, the 9th capacitor C9, diode D1, the 8th capacitor C8 and the 9th capacitor C9 are filter capacitor, are connect respectively after being together in series
Between the signal side a and b of signal isolation module, the tie point of the 8th capacitor and the 9th capacitor connects GND2, the third electricity
Resistance R3 is build-out resistor, is connected in parallel between the end signal A of signal isolation module and the end B, for eliminating common mode interference, diode D1
Anode terminate GND2, cathode terminal is coupled with the end signal A and the end signal B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821276889.6U CN208820756U (en) | 2018-08-08 | 2018-08-08 | A kind of RS485 communication isolation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821276889.6U CN208820756U (en) | 2018-08-08 | 2018-08-08 | A kind of RS485 communication isolation circuit |
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| CN208820756U true CN208820756U (en) | 2019-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821276889.6U Active CN208820756U (en) | 2018-08-08 | 2018-08-08 | A kind of RS485 communication isolation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865984A (en) * | 2020-12-31 | 2021-05-28 | 深圳市共济科技股份有限公司 | Communication interface switching circuit and switching method thereof |
| CN114448853A (en) * | 2021-12-31 | 2022-05-06 | 中船重工西安东仪科工集团有限公司 | A multifunctional serial communication isolation test module |
-
2018
- 2018-08-08 CN CN201821276889.6U patent/CN208820756U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865984A (en) * | 2020-12-31 | 2021-05-28 | 深圳市共济科技股份有限公司 | Communication interface switching circuit and switching method thereof |
| CN114448853A (en) * | 2021-12-31 | 2022-05-06 | 中船重工西安东仪科工集团有限公司 | A multifunctional serial communication isolation test module |
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