CN111862572A - RS485 terminal meter reading system and meter reading mode - Google Patents
RS485 terminal meter reading system and meter reading mode Download PDFInfo
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- CN111862572A CN111862572A CN202010840321.8A CN202010840321A CN111862572A CN 111862572 A CN111862572 A CN 111862572A CN 202010840321 A CN202010840321 A CN 202010840321A CN 111862572 A CN111862572 A CN 111862572A
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- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a meter reading system of an RS485 terminal and a meter reading mode, and the meter reading system comprises a core module, an RS485 driving circuit and an RS485 cable, wherein the core module comprises a processor, a Bluetooth/WiFi module, a 4G wireless module and a power management module, the RS485 driving circuit, the RS485 cable and the processor are electrically connected, the RS485 driving circuit is connected with a reserved 485 interface of an ammeter through the RS485 cable, the RS485 driving circuit adopts a non-polar 485 driving chip, the field meter reading is carried out by adopting the connection mode of the RS485 cable, the interference of operation and maintenance field environment on the meter reading is eliminated, and the non-polar RS485 driving circuit is adopted at the same time, so that the success rate and the accuracy of the field meter reading are improved.
Description
Technical Field
The invention relates to a meter reading system and a meter reading mode of an RS485 terminal.
Background
At present, the operation and maintenance site meter reading modes mainly include an infrared meter reading mode, a laser infrared meter reading mode and an RS485 meter reading mode. The infrared meter reading and the laser infrared meter reading are related to the operation and maintenance field environment, the infrared meter reading fault rate is high in the poor environment, the field environment is improved to meet the meter reading condition in the conventional method, but the field meter reading rate cannot be improved; meanwhile, the existing meter reading mode requires high meter reading skill, and an operator needs certain learning ability, so that the existing meter reading mode needs to be changed, and the accuracy and the convenience of meter reading are improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an RS485 terminal meter reading system and a meter reading mode which are convenient to use, simple to operate, capable of eliminating the interference of operation and maintenance site environment on meter reading by adopting an RS485 cable connection mode, capable of improving the success rate of on-site meter reading and reducing the learning cost of operation and maintenance personnel by adopting a non-polar RS485 driving circuit, and practical and widely applicable.
In order to solve the problems, the invention adopts the following technical scheme:
the utility model provides a RS485 terminal system of checking meter and mode of checking meter, includes core module, RS485 drive circuit and RS485 cable, and the core module includes treater, bluetooth wiFi module, 4G wireless module and power management module, and RS485 drive circuit, RS485 cable, treater pass through the electricity and connect, and RS485 drive circuit reserves 485 interface connection through RS485 cable and ammeter, RS485 drive circuit adopts nonpolarity 485 driver chip.
Preferably, the nonpolar 485 driver chip is provided with 8 pins, which are respectively an RO pin, an RE pin, a DE pin, a DI pin, a VCC pin, a B pin, an a pin, and a GND pin, the a pin and the B pin of the nonpolar 485 driver chip are respectively connected with an RS485A + terminal and an RS 485B-terminal, R124 and R125 are connected between the RS485A + terminal, the RS 485B-terminal, and the nonpolar 485 driver chip, the R124 is an input pull-up resistor, and the R125 is an input pull-down resistor.
According to the arrangement, the compatible meter reading of the polar electric meter and the nonpolar electric meter is realized.
Preferably, R126 is connected between R124 and R125, and R126 is an impedance matching resistor.
Preferably, a VCC pin of the non-polar 485 driver chip is connected with C25 and C27, C25 and C27 are input filter capacitors, and C25 and C27 are connected in parallel.
The arrangement filters out the AC component unnecessary for the non-polar 485 driver chip power supply, and smoothes the DC power supply.
Preferably, R105 is connected between a GND pin and a DI pin of the nonpolar 485 driver chip, and the R105 is a pull-down resistor.
The arrangement makes the drive input pin of the nonpolar 485 drive chip low.
Preferably, the RO pin and the DI pin of the nonpolar 485 drive chip are respectively connected with an RS485-RX wiring end and an RS485-TX wiring end, R122 is arranged between the RS485-RX wiring end and the RO pin of the nonpolar 485 drive chip, and R122 is a pull-up resistor.
The arrangement makes the receiver output pin of the non-polar 485 driver chip high.
Preferably, R140 is arranged between the RS485-TX terminal and the DI pin of the non-polar 485 driver chip.
Preferably, the RE pin and the DE pin of the non-polar 485 driver chip are connected with R29, R30 and R31, and R123 is connected between R140 and R31.
The invention has the beneficial effects that: the on-site meter reading device is convenient to use and simple to operate, the interference of the operation and maintenance on-site environment to meter reading is eliminated by performing on-site meter reading in a connection mode of the RS485 cable, meanwhile, the non-polar RS485 driving circuit is adopted, the on-site meter reading success rate is improved, the learning cost of operation and maintenance personnel is reduced, and the on-site meter reading device has practicability and application universality.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, but the protection scope of the present invention is not limited.
FIG. 1 is an RS485 driver circuit of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention;
Detailed Description
Referring to fig. 1 to 2, the RS485 terminal meter reading system and the meter reading method are characterized in that: the intelligent meter reading device comprises a core module, an RS485 drive circuit and an RS485 cable, wherein the core module comprises a processor, a Bluetooth/WiFi module, a 4G wireless module and a power management module, the Bluetooth/WiFi module and the 4G wireless module are used for transmitting meter reading information, the power management module is used for providing power for the RS485 drive circuit, the RS485 cable and the processor are electrically connected, the RS485 drive circuit is connected with a reserved 485 interface of an electric meter through the RS485 cable, the RS485 drive circuit adopts a nonpolar 485 drive chip, the nonpolar 485 drive chip is provided with 8 pins which are respectively an RO pin, an RE pin, a DE pin, a DI pin, a VCC pin, a B pin, an A pin and a GND pin, the A pin and the B pin of the nonpolar drive chip are respectively connected with an RS A + wiring terminal and an RS 485B-wiring terminal, R124 and R125 are connected between the RS485 + wiring terminal, the RS B-wiring terminal and the nonpolar drive chip, r124 is an input pull-up resistor, R125 is an input pull-down resistor, R126 is connected between R124 and R125, and R126 is an impedance matching resistor.
The circuit comprises a nonpolar 485 drive chip and is characterized in that a VCC pin of the nonpolar 485 drive chip is connected with C25 and C27, C25 and C27 are input filter capacitors, C25 and C27 are connected in parallel, R105 is connected between a GND pin and a DI pin of the nonpolar 485 drive chip, R105 is a pull-down resistor, an RO pin and a DI pin of the nonpolar 485 drive chip are respectively connected with an RS485-RX wiring end and an RS485-TX wiring end, R122 is arranged between the RS485-RX wiring end and the RO pin of the nonpolar 485 drive chip, R122 is a pull-up resistor, R140 is arranged between the RS485-TX wiring end and the DI pin of the nonpolar drive chip, an RE pin and a DE pin of the nonpolar drive chip are connected with R29, R30 and R31, and R123 is connected between R140 and R31.
The RS485 driving circuit has the power supply voltage of 5V and the working voltage of 3.3V.
One end of R124 is connected with 5V power supply voltage.
One end of the R122 is connected with 3.3V working voltage.
The scheme of the invention is based on a terminal of a Union department MT8768A platform.
The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (8)
1. The utility model provides a RS485 terminal system and mode of checking meter which characterized in that: including core module, RS485 drive circuit and RS485 cable, the core module includes treater, bluetooth/wiFi module, 4G wireless module and power management module, and RS485 drive circuit, RS485 cable, treater pass through the electricity and connect, and RS485 drive circuit reserves 485 interface connection through RS485 cable and ammeter, RS485 drive circuit adopts nonpolarity 485 driver chip.
2. The RS485 terminal meter reading system and the meter reading mode according to claim 1, wherein: the nonpolar 485 driver chip is provided with 8 pins, including an RO pin, an RE pin, a DE pin, a DI pin, a VCC pin, a B pin, an A pin and a GND pin, wherein the A pin and the B pin of the nonpolar 485 driver chip are respectively connected with an RS485A + wiring end and an RS 485B-wiring end, R124 and R125 are connected between the RS485A + wiring end, the RS 485B-wiring end and the nonpolar 485 driver chip, the R124 is an input pull-up resistor, and the R125 is an input pull-down resistor.
3. The RS485 terminal meter reading system and the meter reading mode according to claim 2, wherein: and R126 is connected between the R124 and the R125, and the R126 is an impedance matching resistor.
4. The RS485 terminal meter reading system and the meter reading mode according to claim 2, wherein: the pin VCC of the non-polar 485 driver chip is connected with C25 and C27, C25 and C27 are input filter capacitors, and C25 and C27 are connected in parallel.
5. The RS485 terminal meter reading system and the meter reading mode according to claim 2, wherein: and R105 is connected between a GND pin and a DI pin of the nonpolar 485 driving chip, and the R105 is a pull-down resistor.
6. The RS485 terminal meter reading system and the meter reading mode according to claim 2, wherein: the RO pin and the DI pin of the nonpolar 485 drive chip are respectively connected with an RS485-RX wiring end and an RS485-TX wiring end, R122 is arranged between the RS485-RX wiring end and the RO pin of the nonpolar 485 drive chip, and the R122 is a pull-up resistor.
7. The RS485 terminal meter reading system and the meter reading mode according to claim 6, wherein: and R140 is arranged between the RS485-TX terminal and a DI pin of the non-polar 485 driving chip.
8. The RS485 terminal meter reading system and the meter reading mode according to claim 7, wherein: the RE pin and the DE pin of the non-polar 485 driving chip are connected with R29, R30 and R31, and R123 is connected between R140 and R31.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010840321.8A CN111862572A (en) | 2020-08-20 | 2020-08-20 | RS485 terminal meter reading system and meter reading mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010840321.8A CN111862572A (en) | 2020-08-20 | 2020-08-20 | RS485 terminal meter reading system and meter reading mode |
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| Publication Number | Publication Date |
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| CN111862572A true CN111862572A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010840321.8A Pending CN111862572A (en) | 2020-08-20 | 2020-08-20 | RS485 terminal meter reading system and meter reading mode |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323737A (en) * | 2013-06-13 | 2013-09-25 | 国家电网公司 | RS-485 interface polarity detecting method and system based on electric energy meter communication protocol |
| CN203249938U (en) * | 2013-03-29 | 2013-10-23 | 华立仪表集团股份有限公司 | Communication circuit of electrical measuring meters |
| CN205068599U (en) * | 2015-10-14 | 2016-03-02 | 哈尔滨电工仪表研究所 | One -phase fee -controlling intelligent electric energy meter |
| CN205582255U (en) * | 2016-04-18 | 2016-09-14 | 江苏润圣电气有限公司 | A intelligent adapter for power consumption information acquisition |
| CN205749617U (en) * | 2016-06-16 | 2016-11-30 | 深圳市江机实业有限公司 | Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit |
| CN106546833A (en) * | 2015-09-16 | 2017-03-29 | 中国电力科学研究院 | A kind of electric energy meter RS-485 communication chip networking test systems |
| JP2018082227A (en) * | 2016-11-14 | 2018-05-24 | 株式会社東光高岳 | Meter reading system |
| CN210442445U (en) * | 2018-11-13 | 2020-05-01 | 广州耐奇电气科技有限公司 | Electric information acquisition unit |
| CN212322421U (en) * | 2020-08-20 | 2021-01-08 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system |
-
2020
- 2020-08-20 CN CN202010840321.8A patent/CN111862572A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203249938U (en) * | 2013-03-29 | 2013-10-23 | 华立仪表集团股份有限公司 | Communication circuit of electrical measuring meters |
| CN103323737A (en) * | 2013-06-13 | 2013-09-25 | 国家电网公司 | RS-485 interface polarity detecting method and system based on electric energy meter communication protocol |
| CN106546833A (en) * | 2015-09-16 | 2017-03-29 | 中国电力科学研究院 | A kind of electric energy meter RS-485 communication chip networking test systems |
| CN205068599U (en) * | 2015-10-14 | 2016-03-02 | 哈尔滨电工仪表研究所 | One -phase fee -controlling intelligent electric energy meter |
| CN205582255U (en) * | 2016-04-18 | 2016-09-14 | 江苏润圣电气有限公司 | A intelligent adapter for power consumption information acquisition |
| CN205749617U (en) * | 2016-06-16 | 2016-11-30 | 深圳市江机实业有限公司 | Intelligent electric energy meter polarized RS485 and nonpolarity RS485 compatibility interface circuit |
| JP2018082227A (en) * | 2016-11-14 | 2018-05-24 | 株式会社東光高岳 | Meter reading system |
| CN210442445U (en) * | 2018-11-13 | 2020-05-01 | 广州耐奇电气科技有限公司 | Electric information acquisition unit |
| CN212322421U (en) * | 2020-08-20 | 2021-01-08 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system |
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Application publication date: 20201030 |