CN203968091U - A kind of RS485 Anti-jamming Communication system based on flow measurement device - Google Patents
A kind of RS485 Anti-jamming Communication system based on flow measurement device Download PDFInfo
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- CN203968091U CN203968091U CN201420417176.2U CN201420417176U CN203968091U CN 203968091 U CN203968091 U CN 203968091U CN 201420417176 U CN201420417176 U CN 201420417176U CN 203968091 U CN203968091 U CN 203968091U
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Abstract
The utility model discloses a kind of RS485 Anti-jamming Communication system based on flow measurement device.Comprise externally fed module, in-line power module, for switching electrical source exchange module, RS485 communication module and the photoelectric isolating circuit module of inside and outside power supply; The input of described electrical source exchange module is connected with described externally fed module and in-line power module respectively, the output of described electrical source exchange module is connected with described RS485 communication module and photoelectric isolating circuit module for power supply interface respectively, described RS485 communication module is connected with described photoelectric isolating circuit module, and described photoelectric isolating circuit module is connected with the main control module of flow measurement device.The utility model adopts anti-jamming circuit design, allow whole communication system there is better interference free performance, there is internal electric source, external power source commutation circuit simultaneously, ensure that externally fed switches to in-line power in time while disappearance, make whole system have stronger adaptive capacity to environment, operating state is more stable.
Description
Technical field
The utility model relates to instrument communication field, relates in particular to a kind of RS485 Anti-jamming Communication system based on flow measurement device.
Background technology
At present, the supply power mode of flow measurement device RS485 communication system is divided into two kinds of in-line power and externally feds.Wherein, it is more bleak and desolate, severe that in-line power mode is used for environment for use, can not provide in the situation of effective externally fed, but in-line power mode has and need regularly change battery, also easily quits work because battery altering causes communication system not in time; Along with popularizing of photovoltaic generation, wind power generation, the flow measurement device communication system that is applied to more bleak and desolate environment is more and more applied the new forms of energy such as photoelectricity, wind-powered electricity generation mode provides externally fed, but photoelectricity and wind-powered electricity generation have the environment of being subject to, climatic effect is large, the problems such as power supply instability, meanwhile, severe operational environment is also had higher requirement to the interference free performance of communication system.
Utility model content
For the flow measurement device communication system that makes to be operated under specific condition has more stable power supply and better anti-interference, the utility model provides a kind of RS485 Anti-jamming Communication system based on flow measurement device, comprises externally fed module, in-line power module, for switching electrical source exchange module, RS485 communication module and the photoelectric isolating circuit module of inside and outside power supply;
The input of described electrical source exchange module is connected with described externally fed module and in-line power module respectively, the output of described electrical source exchange module is connected with described RS485 communication module and photoelectric isolating circuit module for power supply interface respectively, described RS485 communication module is connected with described photoelectric isolating circuit module, described photoelectric isolating circuit module is connected with the main control module of flow measurement device.
Further, described externally fed module comprises step-down conversion chip, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first inductance and the first Schottky diode;
Wherein, the pin 2 of described step-down conversion chip is connected with external power source, meanwhile, the pin 2 of described step-down conversion chip by and the first electric capacity of connecing be connected with ground wire with the second electric capacity;
The pin 4 of described step-down conversion chip is connected with ground wire with the first resistance by the 3rd electric capacity respectively with pin 5;
The pin 1 of described step-down conversion chip is connected with pin 10 by the 4th electric capacity, the pin 10 of described step-down conversion chip also connects one end of negative pole and described first inductance of described the first Schottky diode simultaneously, the anode of described the first Schottky diode is connected with ground wire, the other end of described the first inductance is the output of described externally fed module, the other end of the first inductance also by and the 7th electric capacity that connects be connected with ground wire with the 8th electric capacity, simultaneously, the other end of described the first inductance is also connected with the pin 7 of described step-down conversion chip by the 3rd resistance, the pin 7 of described step-down conversion chip is also connected with ground wire by the 4th resistance,
One end of described the second resistance is connected with the pin 8 of described step-down conversion chip and one end of the 6th electric capacity simultaneously, and the other end of described the second resistance is connected with ground wire by the 5th electric capacity, and the other end of described the 6th electric capacity is connected with ground wire.
Described external power source module is reduced to 5 volt by outer power voltage by 24 volts by the peripheral filter regulator circuit of step-down conversion chip and described step-down conversion chip.
Further, described electrical source exchange module comprises P channel MOS tube, pressurizer and rectifier diode, the grid of described P channel MOS tube is connected with described external power source module, the source electrode of described P channel MOS tube is connected with described in-line power module, described external power source module is also connected with described P channel MOS tube drain electrode with rectifier diode by pressurizer, and the drain electrode of described P channel MOS tube is the output of described Switching power module;
In the time of outside power module energising, the VGS of described P channel MOS tube is that forward is pressed, and metal-oxide-semiconductor turn-offs, and described electrical source exchange module output output is through the external voltage of pressurizer and rectifier diode voltage stabilizing rectification; In the time of external power source power-off, the VGS of described P channel MOS tube is negative pressure, and metal-oxide-semiconductor is connected, the builtin voltage of described electrical source exchange module output output internal electric source.
Further, described photoelectric isolating circuit module comprises the first photoelectric isolating device, the second photoelectric isolating device, the 3rd photoelectric isolating device, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
The pin 1 of described the first photoelectric isolating device is connected with power supply by the 5th resistance, the pin 2 of described the first photoelectric isolating device is connected with the receiving interface of described RS485 module, the pin 3 of described the first photoelectric isolating device is connected with power supply by the 6th resistance, simultaneously, the pin 3 of described the first photoelectric isolating device is also connected with the main control module of flow measurement device, and the pin 4 of described the first photoelectric isolating device is connected with ground wire;
The pin 1 of described the second photoelectric isolating device is connected with power supply by the 7th resistance, the pin 2 of described the second photoelectric isolating device is connected with the main control module of flow measurement device, the pin 3 of described the second photoelectric isolating device is connected with power supply, 4 whiles of pin of described the second photoelectric isolating device enable interface with the reception of described RS485 module and transmission and are connected, meanwhile, the pin 4 of described the second photoelectric isolating device is also connected with ground wire by the 8th resistance;
The pin 1 of described the 3rd photoelectric isolating device is connected with power supply by the 9th resistance, the pin 2 of described the 3rd photoelectric isolating device is connected with the main control module of flow measurement device, the pin 3 of described the 3rd photoelectric isolating device is connected with the transmission interface of described RS485 module, the pin 3 of described the 3rd photoelectric isolating device is also connected with power supply by the tenth resistance simultaneously, and the pin 4 of described the 3rd photoelectric isolating device is connected with ground wire.
Further, described RS485 communication module comprises RS485 chip and the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance and the 15 resistance;
The pin 7 of described RS485 chip is connected with ground wire by the 11 resistance, and meanwhile, the pin 7 of described RS485 chip is also connected with one end of the 15 resistance by the 13 resistance;
The pin 6 of described RS485 chip is connected with power supply by the 12 resistance, and meanwhile, the pin 6 of described RS485 chip is also connected with other one end of the 15 resistance by the 14 resistance;
The beneficial effects of the utility model are:
1, there is internal electric source, external power source handoff functionality, in the time that communication system described in the utility model utilizes outside unstable power supply (as photoelectricity, wind-powered electricity generation), as externally fed disappears, switch in time in-line power, when externally fed recovers, switch in time externally fed, cut off in-line power simultaneously, save internal electric source, make whole system have stronger adaptive capacity to environment, operating state is more stable.
2, externally fed circuit and 485 communication modules adopt anti-jamming circuit design, allow whole communication system have better anti-interference, ensure instrument communication.
Brief description of the drawings:
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is the utility model external power source module circuit diagram;
Fig. 3 is the utility model electrical source exchange modular circuit block diagram;
Fig. 4 is the utility model RS485 communication module and photoelectric isolating circuit module circuit diagram;
Wherein: I is external power source module; II is internal-external power module; III is electrical source exchange module; IV is photoelectric isolating circuit module; V is RS485 communication module.
Embodiment
Below in conjunction with test example and embodiment, the utility model is described in further detail.But this should be interpreted as to the scope of the above-mentioned theme of the utility model only limits to following embodiment, all technology realizing based on the utility model content all belong to scope of the present utility model.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of RS485 Anti-jamming Communication system based on flow measurement device, comprises externally fed module I, in-line power module II, for switching electrical source exchange module III, photoelectric isolating circuit module IV and the RS485 communication module V of inside and outside power supply;
The input of described electrical source exchange module III is connected with described externally fed module I and in-line power module II respectively, the output of described electrical source exchange module III is connected with described RS485 communication module V and photoelectric isolating circuit module IV power supply interface respectively, described RS485 communication module V is connected with described photoelectric isolating circuit module IV, and described photoelectric isolating circuit module IV is connected with the main control module of flow measurement device.
As shown in Figure 2, described externally fed module I comprises step-down conversion chip TPS5401, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first inductance L 1 and the first Schottky diode D1;
Wherein, the pin 2 of described step-down conversion chip TPS5401 is connected with external power source SVCC, meanwhile, the pin 2 of described step-down conversion chip TPS5401 by and the first capacitor C 1 of connecing be connected with ground wire SGND with the second capacitor C 2;
The pin 4 of described step-down conversion chip TPS5401 is connected with ground wire SGND with the first resistance R 1 by the 3rd capacitor C 3 respectively with pin 5;
The pin 1 of described step-down conversion chip TPS5401 is connected with pin 10 by the 4th capacitor C 4, the pin 10 of described step-down conversion chip TPS5401 also connects the negative pole of described the first Schottky diode D1 and one end of described the first inductance L 1 simultaneously, the anode of described the first Schottky diode D1 is connected with ground wire SGND, the other end of described the first inductance L 1 is the output VCC-W of described externally fed module I, the other end of the first inductance L 1 also by and the 7th capacitor C 7 that connects be connected with ground wire SGND with the 8th capacitor C 8, simultaneously, the other end of described the first inductance L 1 is also connected with the pin 7 of described step-down conversion chip I by the 3rd resistance R 3, the pin 7 of described step-down conversion chip I is also connected with ground wire by the 4th resistance R 4,
One end of described the second resistance R 2 is connected with the pin 8 of described step-down conversion chip TPS5401 and one end of the 6th capacitor C 6 simultaneously, the other end of described the second resistance R 2 is connected with ground wire by the 5th capacitor C 5, and the other end of described the 6th capacitor C 6 is connected with ground wire;
Described external power source module is reduced to 5 volt by outer power voltage by 24 volts by the peripheral filter regulator circuit of step-down conversion chip and described step-down conversion chip.
As shown in Figure 3, described electrical source exchange module III comprises P channel MOS tube, pressurizer and voltage stabilizing didoe, the grid of described P channel MOS tube is connected with the output VCC-W of described external power source module I, the source electrode of described P channel MOS tube is connected with the output VCC-N of described in-line power module II, the output VCC-W of described external power source module I is also connected with described P channel MOS tube drain electrode with rectifier diode by pressurizer, and the drain electrode of described P channel MOS tube is the output VDD of described Switching power module III;
In the time of outside power module energising, the VGS of described P channel MOS tube is that forward is pressed, and metal-oxide-semiconductor turn-offs, and described electrical source exchange module output output is through the external voltage of pressurizer and rectifier diode voltage stabilizing rectification; In the time of external power source power-off, the VGS of described P channel MOS tube is negative pressure, and metal-oxide-semiconductor is connected, the builtin voltage of described electrical source exchange module output output internal electric source.
As shown in Figure 4, described photoelectric isolating circuit module IV comprises the first photoelectric isolating device U1, the second photoelectric isolating device U2, the 3rd photoelectric isolating device U3 (three photoelectric isolating devices all adopt optocoupler TLP181GB), the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10;
The pin 1 of described the first photoelectric isolating device U1 is connected with power vd D by the 5th resistance R 5, the pin 2 of described the first photoelectric isolating device U1 is connected with the receiving interface of described RS485 module, the pin 3 of described the first photoelectric isolating device U1 is connected with power vd D by the 6th resistance R 6, simultaneously, the pin 3 of described the first photoelectric isolating device U1 is also connected with the URXD port of the main control module of flow measurement device, and the pin 4 of described the first photoelectric isolating device U1 is connected with ground wire SGND;
The pin 1 of described the second photoelectric isolating device U2 is connected with power vd D by the 7th resistance R 7, the pin 2 of described the second photoelectric isolating device U2 is connected with the main control module SEL port of flow measurement device, the pin 3 of described the second photoelectric isolating device U2 is connected with power vd D, 4 whiles of pin of described the second photoelectric isolating device U2 enable interface with the reception of described RS485 module and transmission and are connected, meanwhile, the pin 4 of described the second photoelectric isolating device U2 is also connected with ground wire SGND by the 8th resistance R 8;
The pin 1 of described the 3rd photoelectric isolating device U3 is connected with power vd D by the 9th resistance R 9, the pin 2 of described the 3rd photoelectric isolating device U3 is connected with the main control module UTXD port of flow measurement device, the pin 3 of described the 3rd photoelectric isolating device U3 is connected with the transmission interface of described RS485 module, the pin 3 of described the 3rd photoelectric isolating device U3 is also connected with power vd D by the tenth resistance R 10 simultaneously, and the pin 4 of described the 3rd photoelectric isolating device U3 is connected with ground wire SGND.
Described RS485 communication module comprises RS485 chip SN75LBC184 and the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R the 14 and the 15 resistance R 15;
The pin 7 of described RS485 chip SN75LBC184 is connected with ground wire SGND by the 11 resistance R 11, and meanwhile, the pin 7 of described RS485 chip SN75LBC184 is also connected with one end of the 15 resistance R 15 by the 13 resistance R 13;
The pin 6 of described RS485 chip SN75LBC184 is connected with power vd D by the 12 resistance R 12, and meanwhile, the pin 6 of described RS485 chip SN75LBC184 is also connected with other one end of the 15 resistance R 15 by the 14 resistance R 14;
The beneficial effects of the utility model are:
1, there is internal electric source, external power source handoff functionality, in the time that the communication system external power source shown in the utility model is unstable (as photoelectricity, wind-powered electricity generation), as externally fed disappears, switch in time in-line power, when externally fed recovers, switch in time externally fed, cut off in-line power simultaneously, save internal electric source, make whole communication system have stronger adaptive capacity to environment, operating state is more stable.
2, externally fed circuit and 485 communication modules adopt anti-jamming circuit design, allow whole communication system have better anti-interference, ensure instrument communication.
Claims (5)
1. the RS485 Anti-jamming Communication system based on flow measurement device, is characterized in that, comprises externally fed module, in-line power module, for switching electrical source exchange module, RS485 communication module and the photoelectric isolating circuit module of inside and outside power supply;
The input of described electrical source exchange module is connected with described externally fed module and in-line power module respectively, the output of described electrical source exchange module is connected with described RS485 communication module and photoelectric isolating circuit module for power supply interface respectively, described RS485 communication module is connected with described photoelectric isolating circuit module, and described photoelectric isolating circuit module is connected with the main control module of flow measurement device.
2. the RS485 Anti-jamming Communication system based on flow measurement device according to claim 1, it is characterized in that, described externally fed module comprises step-down conversion chip, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first inductance and the first Schottky diode;
Wherein, the pin 2 of described step-down conversion chip is connected with external power source, and meanwhile, the pin 2 of described step-down conversion chip is connected with ground wire with the second electric capacity by the first electric capacity in parallel;
The pin 4 of described step-down conversion chip is connected with ground wire with the first resistance by the 3rd electric capacity respectively with pin 5;
The pin 1 of described step-down conversion chip is connected with pin 10 by the 4th electric capacity, the pin 10 of described step-down conversion chip also connects one end of negative pole and described first inductance of described the first Schottky diode simultaneously, the anode of described the first Schottky diode is connected with ground wire, the other end of described the first inductance is the output of described externally fed module, the other end of the first inductance also by and the 7th electric capacity that connects be connected with ground wire with the 8th electric capacity, simultaneously, the other end of described the first inductance is also connected with the pin 7 of described step-down conversion chip by the 3rd resistance, the pin 7 of described step-down conversion chip is also connected with ground wire by the 4th resistance,
One end of described the second resistance is connected with the pin 8 of described step-down conversion chip and one end of the 6th electric capacity simultaneously, and the other end of described the second resistance is connected with ground wire by the 5th electric capacity, and the other end of described the 6th electric capacity is connected with ground wire.
3. the RS485 Anti-jamming Communication system based on flow measurement device according to claim 2, it is characterized in that, described electrical source exchange module comprises P channel MOS tube, pressurizer and rectifier diode, the grid of described P channel MOS tube is connected with described external power source module, the source electrode of described P channel MOS tube is connected with described in-line power module, described external power source module is also connected with described P channel MOS tube drain electrode with rectifier diode by pressurizer, and the drain electrode of described P channel MOS tube is the output of described Switching power module.
4. the RS485 Anti-jamming Communication system based on flow measurement device according to claim 3, it is characterized in that, described photoelectric isolating circuit module comprises the first photoelectric isolating device, the second photoelectric isolating device, the 3rd photoelectric isolating device, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
The pin 1 of described the first photoelectric isolating device is connected with power supply by the 5th resistance, the pin 2 of described the first photoelectric isolating device is connected with the receiving interface of described RS485 module, the pin 3 of described the first photoelectric isolating device is connected with power supply by the 6th resistance, simultaneously, the pin 3 of described the first photoelectric isolating device is also connected with the main control module of flow measurement device, and the pin 4 of described the first photoelectric isolating device is connected with ground wire;
The pin 1 of described the second photoelectric isolating device is connected with power supply by the 7th resistance, the pin 2 of described the second photoelectric isolating device is connected with the main control module of flow measurement device, the pin 3 of described the second photoelectric isolating device is connected with power supply, 4 whiles of pin of described the second photoelectric isolating device enable interface with the reception of described RS485 module and transmission and are connected, meanwhile, the pin 4 of described the second photoelectric isolating device is also connected with ground wire by the 8th resistance;
The pin 1 of described the 3rd photoelectric isolating device is connected with power supply by the 9th resistance, the pin 2 of described the 3rd photoelectric isolating device is connected with the main control module of flow measurement device, the pin 3 of described the 3rd photoelectric isolating device is connected with the transmission interface of described RS485 module, the pin 3 of described the 3rd photoelectric isolating device is also connected with power supply by the tenth resistance simultaneously, and the pin 4 of described the 3rd photoelectric isolating device is connected with ground wire.
5. the RS485 Anti-jamming Communication system based on flow measurement device according to claim 4, it is characterized in that, described RS485 communication module comprises RS485 chip and the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance and the 15 resistance;
The pin 7 of described RS485 chip is connected with ground wire by the 11 resistance, and meanwhile, the pin 7 of described RS485 chip is also connected with one end of the 15 resistance by the 13 resistance;
The pin 6 of described RS485 chip is connected with power supply by the 12 resistance, and meanwhile, the pin 6 of described RS485 chip is also connected with other one end of the 15 resistance by the 14 resistance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104374A (en) * | 2014-07-28 | 2014-10-15 | 成都千嘉科技有限公司 | RS485 anti-interference communication system based on flow metering device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104374A (en) * | 2014-07-28 | 2014-10-15 | 成都千嘉科技有限公司 | RS485 anti-interference communication system based on flow metering device |
| CN104104374B (en) * | 2014-07-28 | 2017-03-08 | 成都千嘉科技有限公司 | A kind of RS485 Anti-jamming Communication system based on flow measurement device |
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Address after: No. 536, Section 1, airport 1st Road, Shuangliu Southwest Airport, Chengdu, Sichuan 610211 Patentee after: Chengdu Qianjia Technology Co.,Ltd. Address before: No. 536, Section 1, airport 1st Road, Shuangliu Southwest Airport, Chengdu, Sichuan 610211 Patentee before: Chengdu Qianjia Technology Co.,Ltd. |