CN201796426U - IC card water meter provided with RS485 interface - Google Patents
IC card water meter provided with RS485 interface Download PDFInfo
- Publication number
- CN201796426U CN201796426U CN2010205264588U CN201020526458U CN201796426U CN 201796426 U CN201796426 U CN 201796426U CN 2010205264588 U CN2010205264588 U CN 2010205264588U CN 201020526458 U CN201020526458 U CN 201020526458U CN 201796426 U CN201796426 U CN 201796426U
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- processing unit
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Abstract
The utility model relates to an IC (Integrate Circuit) card water meter, and provides the IC card water meter provided with a RS485 (Recommended Standard 485) interface, which comprises a power supply circuit, a singlechip central processing unit and a water meter data input and output unit, wherein, the water meter data input and output unit is connected with the singlechip central processing unit; the singlechip central processing unit is connected with a RS485 interface unit and an IC card interface unit; and an output end of the power supply circuit is respectively connected with the singlechip central processing unit and the RS485 interface unit. The IC card water meter combines the advantages of a common IC card water meter and a RS485 water meter, can achieve prepaid control through an IC card and can also achieve the centralized meter reading through a RS485 communication interface so as to obtain real-time data of water utilization information of a user, is time-saving and labor-saving, and is convenient to manage.
Description
Technical field
The utility model relates to a kind of IC-card water meter, a kind of specifically IC-card water meter with the RS485 interface.
Background technology
The water meter that uses is not because there is external power supply at present, and electronic section is generally by the power supply of water meter internal battery, and communication consumption stream is bigger, therefore common IC-card water meter does not generally have communication interface, water supply company need be known user's water situation like this, just must add up by manual metering, takes time and effort.
Summary of the invention
The purpose of this utility model is exactly in order to overcome above-mentioned deficiency of the prior art, and a kind of IC-card water meter with the RS485 interface is provided, and can realize pre-payment control by IC-card, can pass through the RS485 centralized automatic meter-reading again.
The purpose of this utility model is achieved by the following technical solution: a kind of IC-card water meter with the RS485 interface, comprise power circuit, single-chip microcomputer CPU (central processing unit) and the data of water meter input-output unit that links to each other with the single-chip microcomputer CPU (central processing unit), its described single-chip microcomputer CPU (central processing unit) is connected with RS485 interface unit and IC-card interface unit; Power circuit output end links to each other with the RS485 interface unit with the single-chip microcomputer CPU (central processing unit) respectively.
In technique scheme, 1 pin of described IC-card interface unit J7 is by triode BG1, resistance R 11 connects the power switch interface of single-chip microcomputer CPU (central processing unit), 2 pin ground connection, 3 pin connect the card clock end of single-chip microcomputer CPU (central processing unit), 4 pin, 5 pin, 6 pin are respectively by resistance R 12, R13, R14 connects the card reset terminal of single-chip microcomputer CPU (central processing unit), plug-in card test side and card data terminal, 4 pin of IC-card interface unit J7 are by resistance R 18, capacitor C 11 ground connection, 6 pin of IC-card interface unit J7 are by resistance R 17, capacitor C 11 ground connection, 5 pin of IC-card interface unit J7 are by resistance R 15, the plug-in card that R16 connects the single-chip microcomputer CPU (central processing unit) detects power end.
In technique scheme, in the described RS485 interface unit, 1 pin of RS485 chip N1 connects the data output end of single-chip microcomputer CPU (central processing unit), 2 pin connect the reception Enable Pin of single-chip microcomputer CPU (central processing unit) and meet power supply VCC by resistance R 21,3 pin connect the transmission Enable Pin of single-chip microcomputer CPU (central processing unit) and pass through resistance R 22 ground connection, 4 pin connect the data input pin of single-chip microcomputer CPU (central processing unit), 8 pin of RS485 chip are supply pin VCC, by capacitor C 21 ground connection, two of resistance R 23 and transient suppressor D2 terminates at 6 of RS485 chip, between 7 pin, 6 of RS485 chip, 7 pin are respectively by thermistor RT1, RT2 meets delivery outlet J5, is connected to voltage stabilizing diode D5 between 6 pin of RS485 chip and the ground.
The beneficial effects of the utility model are: the advantage that combines common IC-card water meter and RS485 water meter, can realize pre-payment control by IC-card, can pass through RS485 communication interface centralized automatic meter-reading again, obtain the real time data of user's water information, time saving and energy saving, convenient management.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of IC-card water meter with the RS485 interface of the utility model.
Fig. 2 is a circuit connection diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of IC-card water meter of present embodiment with the RS485 interface, comprise power circuit, single-chip microcomputer CPU (central processing unit) and the data of water meter input-output unit that links to each other with the single-chip microcomputer CPU (central processing unit), its described single-chip microcomputer CPU (central processing unit) is connected with RS485 interface unit and IC-card interface unit; Power circuit output end links to each other with the RS485 interface unit with the single-chip microcomputer CPU (central processing unit) respectively.
As shown in Figure 2,1 pin of described IC-card interface unit J7 is by triode BG1, resistance R 11 connects the power switch interface of single-chip microcomputer CPU (central processing unit), 2 pin ground connection, 3 pin connect the card clock end of single-chip microcomputer CPU (central processing unit), 4 pin, 5 pin, 6 pin are respectively by resistance R 12, R13, R14 connects the card reset terminal of single-chip microcomputer CPU (central processing unit), plug-in card test side and card data terminal, 4 pin of IC-card interface unit J7 are by resistance R 18, capacitor C 11 ground connection, 6 pin of IC-card interface unit J7 are by resistance R 17, capacitor C 11 ground connection, 5 pin of IC-card interface unit J7 are by resistance R 15, the plug-in card that R16 connects the single-chip microcomputer CPU (central processing unit) detects power end.
In the described RS485 interface unit, 1 pin of RS485 chip N1 connects the data output end of single-chip microcomputer CPU (central processing unit), 2 pin connect the reception Enable Pin of single-chip microcomputer CPU (central processing unit) and meet power supply VCC by resistance R 21,3 pin connect the transmission Enable Pin of single-chip microcomputer CPU (central processing unit) and pass through resistance R 22 ground connection, 4 pin connect the data input pin of single-chip microcomputer CPU (central processing unit), 8 pin of RS485 chip are supply pin VCC, by capacitor C 21 ground connection, two of resistance R 23 and transient suppressor D2 terminates at 6 of RS485 chip, between 7 pin, 6 of RS485 chip, 7 pin are respectively by thermistor RT1, RT2 meets delivery outlet J5, is connected to voltage stabilizing diode D5 between 6 pin of RS485 chip and the ground.
Claims (3)
1. IC-card water meter with the RS485 interface, comprise power circuit, single-chip microcomputer CPU (central processing unit) and the data of water meter input-output unit that links to each other with the single-chip microcomputer CPU (central processing unit), it is characterized in that: described single-chip microcomputer CPU (central processing unit) is connected with RS485 interface unit and IC-card interface unit; Power circuit output end links to each other with the RS485 interface unit with the single-chip microcomputer CPU (central processing unit) respectively.
2. the IC-card water meter of band RS485 interface according to claim 1, it is characterized in that: 1 pin of described IC-card interface unit J7 is by triode BG1, resistance R 11 connects the power switch interface of single-chip microcomputer CPU (central processing unit), 2 pin ground connection, 3 pin connect the card clock end of single-chip microcomputer CPU (central processing unit), 4 pin, 5 pin, 6 pin are respectively by resistance R 12, R13, R14 connects the card reset terminal of single-chip microcomputer CPU (central processing unit), plug-in card test side and card data terminal, 4 pin of IC-card interface unit J7 are by resistance R 18, capacitor C 11 ground connection, 6 pin of IC-card interface unit J7 are by resistance R 17, capacitor C 11 ground connection, 5 pin of IC-card interface unit J7 are by resistance R 15, the plug-in card that R16 connects the single-chip microcomputer CPU (central processing unit) detects power end.
3. the IC-card water meter of band RS485 interface according to claim 1, it is characterized in that: in the described RS485 interface unit, 1 pin of RS485 chip N1 connects the data output end of single-chip microcomputer CPU (central processing unit), 2 pin connect the reception Enable Pin of single-chip microcomputer CPU (central processing unit) and meet power supply VCC by resistance R 21,3 pin connect the transmission Enable Pin of single-chip microcomputer CPU (central processing unit) and pass through resistance R 22 ground connection, 4 pin connect the data input pin of single-chip microcomputer CPU (central processing unit), 8 pin of RS485 chip are supply pin VCC, by capacitor C 21 ground connection, two of resistance R 23 and transient suppressor D2 terminates at 6 of RS485 chip, between 7 pin, 6 of RS485 chip, 7 pin are respectively by thermistor RT1, RT2 meets delivery outlet J5, is connected to voltage stabilizing diode D5 between 6 pin of RS485 chip and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205264588U CN201796426U (en) | 2010-09-13 | 2010-09-13 | IC card water meter provided with RS485 interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205264588U CN201796426U (en) | 2010-09-13 | 2010-09-13 | IC card water meter provided with RS485 interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201796426U true CN201796426U (en) | 2011-04-13 |
Family
ID=43851326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205264588U Expired - Fee Related CN201796426U (en) | 2010-09-13 | 2010-09-13 | IC card water meter provided with RS485 interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201796426U (en) |
-
2010
- 2010-09-13 CN CN2010205264588U patent/CN201796426U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20180913 |