CN203675081U - RS485 communication circuit - Google Patents
RS485 communication circuit Download PDFInfo
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- CN203675081U CN203675081U CN201320809982.XU CN201320809982U CN203675081U CN 203675081 U CN203675081 U CN 203675081U CN 201320809982 U CN201320809982 U CN 201320809982U CN 203675081 U CN203675081 U CN 203675081U
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- 238000004891 communication Methods 0.000 title claims abstract description 61
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
An RS485 communication circuit provided by the utility model comprises an RS485 communication chip ADM2483 and a peripheral circuit. A first pin, a seventh pin and a sixteenth pin of the communication chip are connected to a 5V power supply. A second pin and an eighth pin are digitally grounded. A ninth pin and a fifteenth pin are grounded. A third pin is connected to an RX port of a controller. A sixth pin is connected to a TX port of the controller. A twelfth pin is connected to the 5V power supply via a resistor R1. A thirteenth pin is grounded via a resistor R4. A fourth pin and a fifth pin are connected. The peripheral circuit connected to the communication chip includes a capacitor C1, a capacitor C2, a resistor R6, a resistor R7, a digital chip 74HC14, a diode D1, a diode D2, a capacitor C3, and a resistor R5. The RS485 communication circuit is low in cost, small in size, low in power consumption, and quick in response, with zero delay and complete protection.
Description
Technical field
The utility model relates to a kind of telecommunication circuit, relates in particular to a kind of RS485 telecommunication circuit.
Background technology
RS485 is often used as a kind of relatively economical, have that suitable strong noise suppresses, the communications platform of relatively high transmission rate, long transmission distance, wide common mode range.485 general telecommunication circuits only have simple data transmission-receiving function and isolation features, not strong for the protective value of circuit, in addition, need fast reaction for some, or even the communication of zero-lag under requiring, and existing circuit cannot reach this requirement.
Summary of the invention
For solving above-mentioned defect of the prior art; the utility model provides RS485 telecommunication circuit, and this circuit not only can be realized the isolated communication of RS485, and has greatly strengthened the protective value of circuit; meanwhile, this circuit power consumption realizes the function that information is transmitted under zero-lag.
For solving the problems of the technologies described above, the utility model scheme comprises: RS485 telecommunication circuit, it is characterized in that, comprise RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with the RX port of controller, the 6th pin of communication chip is connected with the TX port of controller, the 12 pin of communication chip is connected on 5V power supply by resistance R 1, the 13 pin of communication chip is by resistance R 4 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 1, capacitor C 2, resistance R 6, resistance R 7, digit chip 74HC14, diode D1, diode D2, capacitor C 3, resistance R 5, the positive pole of capacitor C 1 connects 5V power supply, the negative pole digital grounding of C1, a termination 5V power supply of C2, the other end ground connection of C2, the 14 pin of digit chip connects 5V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects the RX port of Transistor-Transistor Logic level, the 3rd pin of digit chip and the 5th pin connect the TX port of Transistor-Transistor Logic level, the second pin of digit chip is connected with the positive pole of D4 by resistance R 7, the 4th pin of digit chip is connected with the positive pole of D3 by resistance R 6, the negative pole of D3 and the negative pole of D4 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R2 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R3 connect respectively the 13 pin and second input port of communication chip, one end of D1 connects first input end mouth, other end ground connection, one end of D2 connects the second input port, other end ground connection, one end of R5 connects power cathode, other end ground connection, C3 and R5 also connect.
Further, described first input end mouth and the second input port are host computer communication port.
Further, described first input end mouth and the second input port are that frequency converter is communicated by letter and gathered port.
Further, described D3 and D4 are light-emitting diode.
Further, described C1 is for there being polar capacitor.
Further, described D1 and D2 are voltage stabilizing didoe.
Further, the power supply rated current of described C1, communication chip the 7th pin and communication chip the first pin access is 2A.
Further, the power supply rated current of described C2, R1 and communication chip the 16 pin access is 0.2A.
The beneficial effects of the utility model are: in the utility model, communication chip ADM2483 adopts independently Power supply of two-way, realize power supply isolation; The delay of 74HC14 is very little, guarantees to realize zero propagation and sends and accept; R1, R4 have realized enhancing bus driver ability, have guaranteed transmittability and the antijamming capability of signal; D1, D2 can suppress common mode, differential mode interference effectively; R5, C3 have the effect of protection bus.Not only cost is low for whole circuit, volume, and when operation has that stability is high, low in energy consumption, reaction is fast, zero-lag, the complete feature of protection.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, concrete enforcement of the present utility model is described, should be appreciated that exemplifying embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.
RS485 telecommunication circuit as shown in Figure 1, it comprises RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with the RX port of controller, the 6th pin of communication chip is connected with the TX port of controller, the 12 pin of communication chip is connected on 5V power supply by resistance R 1, the 13 pin of communication chip is by resistance R 4 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 1, capacitor C 2, resistance R 6, resistance R 7, digit chip 74HC14, diode D1, diode D2, capacitor C 3, resistance R 5, the positive pole of capacitor C 1 connects 5V power supply, the negative pole digital grounding of C1, a termination 5V power supply of C2, the other end ground connection of C2, the 14 pin of digit chip connects 3V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects the RX port of Transistor-Transistor Logic level, the 3rd pin of digit chip and the 5th pin connect the TX port of Transistor-Transistor Logic level, the second pin of digit chip is connected with the positive pole of D4 by resistance R 7, the 4th pin of digit chip is connected with the positive pole of D3 by resistance R 6, the negative pole of D3 and the negative pole of D4 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R2 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R3 connect respectively the 13 pin and second input port of communication chip, one end of D1 connects first input end mouth, other end ground connection, one end of D2 connects the second input port, other end ground connection, one end of R5 connects ETH interface, other end ground connection, C3 and R5 also connect.
Wherein, RS485 communication chip ADM2483 is a integrated form electric current isolating device, be applicable to the bidirectional data communication of multi-point bus transmission line, it designs for balanced transmission line, meet ANSI TIA/EIA RS-485-A and ISO 8482:1987 (E) standard, this device adopts the iCoupler technology of ADI company, by 3 member passage way isolating apparatus, tri-state differential line driver and difference input sink are integrated in single encapsulation, in circuit, play communication isolating and level conversion effect, and, this chip adopts independently Power supply of two-way, realize power supply isolation.
Capacitor C 1, C2 be for moving back lotus root electric capacity, in order to eliminate the unusual waveforms of power supply and to absorb chip operation and the pulse that produces.
Not gate digit chip 74HC14 realizes the transmission to ADUM2483 and accepts control; because the delay of 74HC14 is very little; assurance realizes zero propagation and sends and accept; simultaneously; 74HC14, R6, R7, D3, the common indication realizing bus data transmission receive status of D4; be convenient to observe and understand data interaction state; concrete function is: 74HC14 realizes amplifying and drives function; R6, R7 are current-limiting resistance; limiting circuit current protection diode; D3, D4 are light-emitting diode, realize the indication to operating state.
R1, R4 are bus biasing resistor, have strengthened bus driver ability, have guaranteed transmittability and the antijamming capability of signal.
R2, R3 are current limliting protective resistance, can be in the time of abnormal signal, and limiting input current, thereby protection late-class circuit.
D1, D2 are transient voltage twin zener dioder; select P6KE15CA; the advantages such as this diode possesses fast response time, instantaneous absorbed power is large, leakage current is little (microampere order), conducting voltage precision is high, clamping voltage is more easy to control, volume is little; can effectively suppress common mode, differential mode interference, protection late-class circuit exempts from the various Electromagnetic Interference such as static, thunder and lightning, switching overvoltage.
R5, C3 form RC network, realize due to voltage spikes and can leak in time and cause the earth, thereby play the effect of protection bus.
Further, described first input end mouth and the second input port are that host computer communication port or frequency converter are communicated by letter and gathered port.
Further, described D3 and D4 are light-emitting diode, described C1 is for there being polar capacitor, described D1 and D2 are transient voltage twin zener dioder, the power supply rated current of described C1, communication chip the 7th pin and communication chip the first pin access is 2A, and the power supply rated current of described C2, R1 and communication chip the 16 pin access is 0.2A.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to the utility model scope of patent protection; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing from the scope situation that the utility model claim protects; can also make the various deformation such as replacement, simple combination, within these all fall into protection range of the present utility model, request protection range of the present utility model should be as the criterion with claims.
Claims (8)
1.RS485 telecommunication circuit, it is characterized in that, comprise RS485 communication chip ADM2483 and peripheral circuit, the first pin of communication chip, the 7th pin and the 16 pin are received respectively on 5V power supply, the second pin of communication chip and the 8th pin digital grounding, the 9th pin and the 15 pin ground connection of communication chip, the 3rd pin of communication chip is connected with the RX port of controller, the 6th pin of communication chip is connected with the TX port of controller, the 12 pin of communication chip is connected on 5V power supply by resistance R 1, the 13 pin of communication chip is by resistance R 4 ground connection, the 4th pin of communication chip is connected with the 5th pin, described peripheral circuit comprises capacitor C 1, capacitor C 2, resistance R 6, resistance R 7, digit chip 74HC14, diode D1, diode D2, capacitor C 3, resistance R 5, the positive pole of capacitor C 1 connects 5V power supply, the negative pole digital grounding of C1, a termination 5V power supply of C2, the other end ground connection of C2, the 14 pin of digit chip connects 5V power supply, the 7th pin digital grounding of digit chip, the first pin of digit chip connects the RX port of Transistor-Transistor Logic level, the 3rd pin of digit chip and the 5th pin connect the TX port of Transistor-Transistor Logic level, the second pin of digit chip is connected with the positive pole of light-emitting diode D4 by resistance R 7, the 4th pin of digit chip is connected with the positive pole of light-emitting diode D3 by resistance R 6, the negative pole of D3 and the negative pole of D4 be digital grounding respectively, the 6th pin of digit chip connects the 4th pin of communication chip, the two ends of R2 connect respectively the 12 pin and the first input end mouth of communication chip, the two ends of R3 connect respectively the 13 pin and second input port of communication chip, one end of D1 connects first input end mouth, other end ground connection, one end of D2 connects the second input port, other end ground connection, one end of R5 connects power cathode, other end ground connection, C3 and R5 also connect.
2. RS485 telecommunication circuit according to claim 1, is characterized in that, described first input end mouth and the second input port are host computer communication port.
3. RS485 telecommunication circuit according to claim 1, is characterized in that, described first input end mouth and the second input port are that frequency converter is communicated by letter and gathered port.
4. according to the RS485 telecommunication circuit described in claim 2 or 3, it is characterized in that, described D3 and D4 are light-emitting diode.
5. according to the RS485 telecommunication circuit described in claim 2 or 3, it is characterized in that, described C1 is for there being polar capacitor.
6. according to the RS485 telecommunication circuit described in claim 2 or 3, it is characterized in that, described D1 and D2 are transient voltage twin zener dioder.
7. according to the RS485 telecommunication circuit described in claim 2 or 3, it is characterized in that, the supply voltage of described C1, communication chip the 7th pin and communication chip the first pin access is 5V.
8. according to the RS485 telecommunication circuit described in claim 2 or 3, it is characterized in that, the power supply rated current of described C2, R1 and communication chip the 16 pin access is 0.2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320809982.XU CN203675081U (en) | 2013-12-11 | 2013-12-11 | RS485 communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320809982.XU CN203675081U (en) | 2013-12-11 | 2013-12-11 | RS485 communication circuit |
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| Publication Number | Publication Date |
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| CN203675081U true CN203675081U (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320809982.XU Expired - Lifetime CN203675081U (en) | 2013-12-11 | 2013-12-11 | RS485 communication circuit |
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| CN (1) | CN203675081U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633985A (en) * | 2013-12-11 | 2014-03-12 | 济南诺辉节能技术开发有限公司 | RS485 communication circuit |
| CN104460466A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | CAN isolating circuit |
-
2013
- 2013-12-11 CN CN201320809982.XU patent/CN203675081U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633985A (en) * | 2013-12-11 | 2014-03-12 | 济南诺辉节能技术开发有限公司 | RS485 communication circuit |
| CN104460466A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | CAN isolating circuit |
| CN104460466B (en) * | 2014-12-25 | 2017-07-04 | 李钢 | A kind of CAN isolation circuits |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Xiangtai Plaza No. 129 250022 Shandong Province, Ji'nan City Central yingxiongshan Road Patentee after: Shandong Nuo Hui power-saving technology development Corp.,Ltd. Address before: Hongyuan business building, No. 69 spring scenery district sunshine new road Ji'nan City, Shandong province 250024 city 7 floor No. 708 Patentee before: JINAN NUOHUI ENERGY-SAVING TECHNOLOGY DEVELOPMENT CO.,LTD. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180420 Address after: 250021 Ji'nan, Central District, Shandong City Road, the southern part of the shop No. 18 Patentee after: SHANDONG GOLDREAL ENERGY CONSERVATION TECHNOLOGY Co.,Ltd. Address before: Xiangtai Plaza No. 129 250022 Shandong Province, Ji'nan City Central yingxiongshan Road Patentee before: Shandong Nuo Hui power-saving technology development Corp.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140625 |