CN203249938U - Communication circuit of electrical measuring meters - Google Patents
Communication circuit of electrical measuring meters Download PDFInfo
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- CN203249938U CN203249938U CN 201320148591 CN201320148591U CN203249938U CN 203249938 U CN203249938 U CN 203249938U CN 201320148591 CN201320148591 CN 201320148591 CN 201320148591 U CN201320148591 U CN 201320148591U CN 203249938 U CN203249938 U CN 203249938U
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- communication
- output terminal
- serial ports
- circuit
- primary processor
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Abstract
Provided is a communication circuit of electrical measuring meters, and the communication circuit is used for transmitting data between a main processor of an electrical measuring meter and an external acquisition apparatus. The communication circuit includes a 485 communication chip which is electrically connected with a control end of the main processor, and the 485 communication chip is provided with an A serial port output terminal and a B serial port output terminal which are led out to connect with a communication interface. The 485 communication circuit provided by the embodiment of the utility model is mature and reliable, and is well compatible with the original 485 circuit needing polarity determination; and the operation process is simple and convenient, and production cost is reduced.
Description
Technical field
The utility model relates to a kind of simple and easy reliably nonpolarity 485 communication schemes, is mainly used in Electrical Measuring Instrument instrument field.
Background technology
RS-232/485 is most widely used a kind of serial line interface in PC and the communication industry, is defined as a kind of single-ended standard that increases communication distance in the low rate serial communication.In the application of electrical measurement instrument, must guarantee the correct of polarity during RS-232/485 communication line installation wiring, could proper communication, understand lessly to 485 because the site operation personnel are common, often wiring error occurs and cause the ammeter can't communication.
Construction along with intelligent grid, requirement to intelligent electric energy is also more and more higher, the collection of intelligent electric energy meter is copied function also among all-round construction, and in the communication of intelligent electric energy meter, 485 communication type electric energy meters have occupied mainstream market, the communication failure that causes for solving error line mistake, there is producer to design nonpolarity 485, but in actual applications, because the nonpolarity realization technology of each producer is different, cause different chips to be difficult to connect together, can not be connected with the polarity 485 that has of original table meter, limited nonpolarity 485 use, and nonpolarity 485 cost is higher, poor reliability still is difficult to spread at present.
The utility model content
The utility model embodiment is mainly used in solving expensive, the complex process of conventional communicating circuit scheme and can't effectively judges the problem of serial ports output polarity.
Technical solutions of the utility model comprise following preferred embodiment:
Technical scheme 1: the communicating circuit of electrical measuring instrument, be used for the primary processor of electrical measuring instrument and the data transmission of outside collecting device, it comprises 485 communication chips that are electrically connected with described primary processor control end, described 485 communication chips are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface, and it improves design and is further to comprise:
Be connected in the detecting circuit between described 485 communication chips and the primary processor, for the height of the output level of judging described A serial ports output terminal and B serial ports output terminal;
With the on-off circuit of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor.
This programme has polarity 485 circuit as the basis take original, utilize 485 circuit A level greater than B level serial ports output high level, the A level is less than the principle of B level serial ports output low level, only needs a CPU that the serial ports level is detected, can judge A Wire/B Wire have or not connect anti-, do not connect anti-the time, serial communication arranges by normal, if A Wire/B Wire connects instead, utilizes the serial ports inverter functionality of CPU, serial communication is set to level inversion and enables, and can normally receive the transmission data.
Technical scheme 2: the communicating circuit of electrical measuring instrument, be used for the primary processor of electrical measuring instrument and the data transmission of outside collecting device, it comprises 485 communication chips that are electrically connected with described primary processor control end, described 485 communication chips are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface, it improves design and is: described 485 communication chips comprise the one 485 communication chip and the 2 485 communication chip, they by and connect a comparator circuit and access described primary processor.
In one embodiment, described comparator circuit further comprises:
A detecting circuit, be used for selecting described the one 485 communication chip and the 2 485 communication chip separately A serial ports output terminal and B serial ports output terminal output level just;
With the on-off circuit of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor.
The 485 communicating circuit mature and reliable of the utility model embodiment can reach effective compatibility with original 485 circuit that need polarity to judge, the implementation procedure simple and convenient, and reduced production cost.
Description of drawings
Fig. 1 is the structural principle block diagram of the utility model preferred embodiment.
Embodiment
Embodiment 1: with reference to accompanying drawing, 485 communicating circuits of electrical measuring instrument, the data transmission that is used for primary processor 1 with the outside collecting device (for example collector or concentrator) of electrical measuring instrument, it comprises 485 communication chips 3 that are electrically connected with described primary processor 1 control end TXD, described 485 communication chips 3 are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface 2, and it improves design and is further to comprise:
Be connected in the detecting circuit 4 between described 485 communication chips 3 and the primary processor 1, for the height comparison of the output level of judging described A serial ports output terminal and B serial ports output terminal;
With the on-off circuit 5 of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor 1 control end EN.
The present embodiment has polarity 485 communicating circuits as the basis take original, utilize 485 circuit A serial ports output terminal level greater than B serial ports output terminal level serial ports output high level, A serial ports output terminal level is less than the principle of B serial ports output terminal level serial ports output low level, only need primary processor 1 to detect by 4 pairs of serial ports output levels of detecting circuit, can judge A Wire/B Wire have or not connect anti-, do not connect anti-the time, serial communication arranges by normal, if A Wire/B Wire connects instead, utilize the serial ports inverter functionality of CPU, serial communication is set to level inversion and enables, and can normally receive the transmission data.
Embodiment 2: another embodiment of 485 communicating circuits of electrical measuring instrument, be used for the primary processor of electrical measuring instrument and the data transmission of outside collecting device, it comprises 485 communication chips that are electrically connected with described primary processor control end, described 485 communication chips are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface, it improves design and is: described 485 communication chips comprise the one 485 communication chip and the 2 485 communication chip, they by and connect a comparator circuit and access described primary processor.
In one embodiment, described comparator circuit further comprises:
A detecting circuit, be used for selecting described the one 485 communication chip and the 2 485 communication chip separately A serial ports output terminal and B serial ports output terminal output level just;
With the on-off circuit of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor.
The principle of the present embodiment is, under normal circumstances, which kind of connected mode no matter, at first the A/B output level of the one 485 communication chip and the 2 485 communication chip being carried out idol connects and judges, if be output as high level, then export to primary processor to reflect the signal of normal connection status, if wherein one is output as low level, then by the anti-phase output low level of being ended of on-off circuit, then realized normal communication by 485 communication chips of selecting the output high level.
Claims (3)
1. the communicating circuit of electrical measuring instrument, be used for the primary processor of electrical measuring instrument and the data transmission of outside collecting device, it comprises 485 communication chips that are electrically connected with described primary processor control end, described 485 communication chips are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface, it is characterized in that further comprising:
Be connected in the detecting circuit between described 485 communication chips and the primary processor, for the height of the output level of judging described A serial ports output terminal and B serial ports output terminal;
With the on-off circuit of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor.
2. the communicating circuit of electrical measuring instrument, be used for the primary processor of electrical measuring instrument and the data transmission of outside collecting device, it comprises 485 communication chips that are electrically connected with described primary processor control end, described 485 communication chips are provided with A serial ports output terminal and the B serial ports output terminal that picks out to communication interface, it is characterized in that: described 485 communication chips comprise the one 485 communication chip and the 2 485 communication chip, they by and connect a comparator circuit and access described primary processor.
3. the communicating circuit of electrical measuring instrument according to claim 2 is characterized in that, described comparator circuit further comprises:
A detecting circuit, be used for selecting described the one 485 communication chip and the 2 485 communication chip separately A serial ports output terminal and B serial ports output terminal output level just;
With the on-off circuit of described detecting circuit electric coupling, its height according to described output level is in addition anti-phase, and it further accesses described primary processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148591 CN203249938U (en) | 2013-03-29 | 2013-03-29 | Communication circuit of electrical measuring meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148591 CN203249938U (en) | 2013-03-29 | 2013-03-29 | Communication circuit of electrical measuring meters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203249938U true CN203249938U (en) | 2013-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320148591 Expired - Fee Related CN203249938U (en) | 2013-03-29 | 2013-03-29 | Communication circuit of electrical measuring meters |
Country Status (1)
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| CN (1) | CN203249938U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111862572A (en) * | 2020-08-20 | 2020-10-30 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system and meter reading mode |
-
2013
- 2013-03-29 CN CN 201320148591 patent/CN203249938U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111862572A (en) * | 2020-08-20 | 2020-10-30 | 杭州华罡智能科技有限公司 | RS485 terminal meter reading system and meter reading mode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 Termination date: 20200329 |
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| CF01 | Termination of patent right due to non-payment of annual fee |