CN103413412A - Portable wireless meter reading system with CH371-based USB interface - Google Patents
Portable wireless meter reading system with CH371-based USB interface Download PDFInfo
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- CN103413412A CN103413412A CN2013103174782A CN201310317478A CN103413412A CN 103413412 A CN103413412 A CN 103413412A CN 2013103174782 A CN2013103174782 A CN 2013103174782A CN 201310317478 A CN201310317478 A CN 201310317478A CN 103413412 A CN103413412 A CN 103413412A
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Abstract
The invention discloses a portable wireless meter reading system with a CH371-based USB interface. The system comprises a wireless information receiving, storing and displaying system device RX, a management level PC and a watt-hour meter electricity utilization information detecting and emitting system device TX, wherein a USB interface of the RX and a USB interface of the management level PC are connected through a data cable; the RX and the TX are in wireless connection; a USB interface of the RX adopts a CH371 interface chip and is connected with a singlechip MCU. As CH371 serves as the USB interface chip of the wireless information receiving, storing and displaying system device RX, the shortcoming that average hardware engineers are restricted from developing and applying USB interface products because the development of a conventional USB interface chip generally requires designers to comprehend the USB standards, Firmware programming, driver programming and the like more deeply is overcome.
Description
Technical field
The present invention relates to a kind of USB interface technical applications, specifically refer to the portable mobile wireless kilowatt meter reading-out system based on the USB interface of CH371.
Background technology
USB (Universal Serial Bus-USB (universal serial bus)) is by Intel, Compaq, Digital, IBM, Microsoft, NEC, the common bus interface standards of new generation of releasing of seven world-renowned computing machines of Northern Telecom and communication common carrier.As the high-speed communication interface between a kind of PC and peripheral hardware, USB has flexible, hot-swappable, a kind of interface of connection and is applicable to plurality of devices, high (the USB1.1 agreement support 12Mbps of speed, the USB2.0 agreement is supported 480Mbps), configuration automatically, without location and move installation procedure, can be peripheral hardware power supply, low-power consumption, low cost, high reliability are provided, thereby widespread use in the products such as digital camera, portable instrument, portable memory apparatus.But, the exploitation General Requirements designer of existing USB interface chip waits more deep understanding is arranged writing of the standard of USB, Firmware (firmware) programming and driver, so has limited the application of general Hardware Engineer to the USB interface product.
Summary of the invention
The object of the invention is to utilize the CH371 interface chip, use is simple, performance is remarkable, cheap characteristics, overcoming general USB interface developer need to have more deep understanding and be difficult to develop the shortcoming of product writing of the standard of USB, Firmware (firmware) programming and driver etc.
The present invention is achieved through the following technical solutions: a kind of portable mobile wireless kilowatt meter reading-out system of the USB interface based on CH371, described system comprises that wireless messages receives storage display system apparatus RX, management level PC, the watt-hour meter power information detects and emission coefficient device TX, the USB mouth of its described RX is connected by data line with the USB mouth of management level PC, its described RX and TX carry out wireless connections, the USB mouth of its described RX adopts the CH371 interface chip, and described USB mouth is connected with single-chip microprocessor MCU.
Further, described RX is comprised of wireless messages storer, liquid crystal display, described wireless messages storer connecting fluid crystal display.
Further, described TX comprises watt-hour meter, telecommunications breath pick-up unit, emission coefficient, and its described watt-hour meter is connected in telecommunications breath pick-up unit, and described telecommunications breath pick-up unit is connected with the emission coefficient device.
Further, described MCU adopts AT89C52.
In sum, the invention has the beneficial effects as follows:
1, at local side, CH371 has 8 bit data bus and reading and writing, sheet select control line and interrupt output, can be articulated on the system bus of the controllers such as single-chip microcomputer, DSP, MCU easily.
2, in computer system, the software kit of CH371 provides succinct easy-to-use operation-interface, with the single chip communication of local side just as the file in reading writing harddisk.
3, CH371 has shielded the institute's protocols having in the usb communication, and the opposite end, providing end is connected between computer utility layer and local side controller.
4,, based on CH371, do not need to understand even driver of any usb protocol or firmware program, just according to circumstances redevelopment application in real time like a cork.
The accompanying drawing explanation
Fig. 1 is the theory diagram of radio meter register and management system.
Fig. 2 is CH371 chip schematic diagram.
Fig. 3 is the hardware interface sketch of CH371 and MCU.
Has embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
As shown in Figure 1, watt-hour meter power information in the portable mobile wireless kilowatt meter reading-out system of described USB interface based on CH371 detects and emission coefficient device TX emits current information with electromagnetic form, and by wireless messages, receive storage display system apparatus RX and accept storage and show, carry out the data processing after then by the USB line, being connected in management level PC.
Preferably; in the present invention; the USB interface chip that described wireless messages receives storage display system RX adopts CH371; as shown in Figure 2; at local side; CH371 has 8 bit data bus and reading and writing, sheet select control line and interrupt output, can be articulated to easily on the system bus of the controllers such as single-chip microcomputer, DSP, MCU; In management level PC, the software kit of CH371 provides succinct easy-to-use operation-interface, with the single chip communication of local side just as the file in reading writing harddisk.CH371 has shielded the institute's protocols having in the usb communication, and the opposite end, providing end is connected between management level PC and local side controller.Based on CH371, do not need to understand even driver of any usb protocol or firmware program, just can be like a cork by the product up-gradation of parallel port, serial ports to USB interface.
Preferably, in the present invention, the USB interface chip that described wireless messages receives storage display system apparatus RX adopts CH371, as shown in Figure 3 be the hardware interface sketch of CH371 and MCU, therefore to the hardware of MCU AT89C52, connect simpler, be mainly in the design of this system, there is no what special requirement as the selection connection of crystal oscillator and reset circuit etc., and the reset signal that resets and can adopt reset circuit of SCM to produce fully of CH371.With the effect of the serial EEPROM 24C01 of I2C interface, be the information such as VID, PID, equipment Serial Number for storage products, as long as the not identical peripheral chip that just can articulate multi-disc band I2C interface in address, the user can utilize the function of the dynamic link libraries provided to complete easily serial EEPROM read and write corresponding information.Certainly in system, also can there is no EEPROM, CH371 will be used VID, PID, product descriptor and the power supply descriptor of acquiescence, and there is no the sequence number of equipment.And for better effects if can be between USB connector 1 and 4 100 μ F electrochemical capacitors of cross-over connection and only stone of 0.1 μ F or ceramic disc capacitor; The best ground connection of the shell of the crystal oscillator of 12MHz; Impedance matching resistance gets final product between 80 Ω ~ 150 Ω.
Preferably, in the present invention, the USB interface chip that described wireless messages receives storage, display system apparatus RX adopts CH371, after the processing mode of the program of the computer utility layer universal driver for the CH371 that loads on computers WINCHIPHEAD and provide, we by wireless messages receive in storage display system apparatus RX the storage information copy out or carry out the real-time function redevelopment.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, equivalent variations that every foundation technical spirit of the present invention is done above embodiment, within all falling into protection scope of the present invention.
Claims (4)
1. kilowatt meter reading-out system of the portable mobile wireless based on the USB interface of CH371, it is characterized in that: described system comprises that wireless messages receives storage display system apparatus RX, management level PC, the watt-hour meter power information detects and emission coefficient device TX, the USB mouth of its described RX is connected by data line with the USB mouth of management level PC, its described RX and TX carry out wireless connections, the USB mouth of its described RX adopts the CH371 interface chip, and described USB mouth is connected with single-chip microprocessor MCU.
2. the portable mobile wireless kilowatt meter reading-out system of the USB interface based on CH371 according to claim 1, it is characterized in that: described RX is comprised of wireless messages storer, liquid crystal display, described wireless messages storer connecting fluid crystal display.
3. the portable mobile wireless kilowatt meter reading-out system of the USB interface based on CH371 according to claim 1, it is characterized in that: described TX comprises watt-hour meter, telecommunications breath pick-up unit, emission coefficient, its described watt-hour meter is connected in telecommunications breath pick-up unit, and described telecommunications breath pick-up unit is connected with the emission coefficient device.
4. the portable mobile wireless kilowatt meter reading-out system of the USB interface based on CH371 according to claim 1, is characterized in that: described MCU employing AT89C52.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103174782A CN103413412A (en) | 2013-07-26 | 2013-07-26 | Portable wireless meter reading system with CH371-based USB interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103174782A CN103413412A (en) | 2013-07-26 | 2013-07-26 | Portable wireless meter reading system with CH371-based USB interface |
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| CN103413412A true CN103413412A (en) | 2013-11-27 |
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| CN2013103174782A Pending CN103413412A (en) | 2013-07-26 | 2013-07-26 | Portable wireless meter reading system with CH371-based USB interface |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303248A (en) * | 2008-06-25 | 2008-11-12 | 上海桑锐电子科技有限公司 | Rapid meter reading on-site printing system |
| CN201322987Y (en) * | 2008-12-29 | 2009-10-07 | 福建网能科技开发有限责任公司 | Intelligent meter reading system based on Wi-Fi wireless communication technology |
| CN101853564A (en) * | 2010-04-28 | 2010-10-06 | 日照市阳光电器有限公司 | Wireless remote meter reading and electrical energy management system |
| CN203433660U (en) * | 2013-07-26 | 2014-02-12 | 国家电网公司 | Portable wireless meter reading system of USB (universal serial bus) interface based on CH371 |
-
2013
- 2013-07-26 CN CN2013103174782A patent/CN103413412A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303248A (en) * | 2008-06-25 | 2008-11-12 | 上海桑锐电子科技有限公司 | Rapid meter reading on-site printing system |
| CN201322987Y (en) * | 2008-12-29 | 2009-10-07 | 福建网能科技开发有限责任公司 | Intelligent meter reading system based on Wi-Fi wireless communication technology |
| CN101853564A (en) * | 2010-04-28 | 2010-10-06 | 日照市阳光电器有限公司 | Wireless remote meter reading and electrical energy management system |
| CN203433660U (en) * | 2013-07-26 | 2014-02-12 | 国家电网公司 | Portable wireless meter reading system of USB (universal serial bus) interface based on CH371 |
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Application publication date: 20131127 |