CN103761849A - CMC (control module on chip)-chip-based low-power-consumption wireless meter reading acquirer - Google Patents
CMC (control module on chip)-chip-based low-power-consumption wireless meter reading acquirer Download PDFInfo
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Abstract
The invention discloses a CMC (control module on chip)-chip-based low-power-consumption wireless meter reading acquirer, which comprises a CMC chip, a serial port circuit, an RS485 interface circuit and a radio frequency chip, wherein the CMC chip is connected with the radio frequency chip through an SPI (serial peripheral interface); the CMC chip is connected with the serial port circuit, and is also connected with the RS485 interface circuit; a crystal oscillation clock is arranged on the CMC chip; a crystal oscillation clock is arranged on the radio frequency chip; the radio frequency chip is used for transmitting data in a transmission cache of the chip to the air, or receiving wireless data in the air to a receiving cache of the chip; the crystal oscillation clock is used for generating crystal oscillation, and providing a clock tick for the work of the radio frequency chip. The multifunction, high network capacity, convenience in installation and maintenance, safety, high reliability, networkability and the like of the acquirer cannot be matched by those of other similar products.
Description
Technical field
The present invention relates to the civilian field of checking meter, be mainly used in the kilowatt meter reading-out system of ammeter, gas meter, flow meter, water meter, this collector uses CMC chip and radio frequency chip as hardware platform, by wireless communication protocol stack, sets up a short-range wireless network, makes can pass mutually data between collector.
Background technology
Along with the fast development of the development of electronics and the communication technology, wireless communication technology provides powerful technical support for Automatic meter reading system, make the automatic data logging in whole region become possibility, the up employing carrier communication of collector, descending pass through 485 and electric energy meter logical, this mode advantage is the jumping figure that has reduced communication route, saved the time of route, in order to improve the efficiency of intelligent meter data recording, safety and reliability, reduce the cost of kilowatt meter reading-out system, a kind of low power consumption wireless meter reading collector based on CMC chip of this statement.
Summary of the invention
In order to solve the problems such as high-level efficiency, reliability, security and the antijamming capability of low power consumption wireless meter reading systems face, the object of this invention is to provide a kind of low power consumption wireless meter reading collector based on CMC chip.
To achieve these goals, concrete technical scheme of the present invention is as follows:
A low power consumption wireless meter reading collector based on CMC chip, comprising: CMC chip, serial port circuit, RS485 interface circuit, radio frequency chip;
Described CMC chip is connected with radio frequency chip by SPI data-interface;
Described CMC chip is connected with serial port circuit, is also connected with RS485 interface circuit;
Described CMC chip is provided with crystal oscillator clock;
Described radio frequency chip is provided with crystal oscillator clock.
Described CMC chip is realized the management and running between routine processes and the program that realizes logic control and motion control in sheet, realizes the processing of controlling relevant analog quantity, digital quantity signal in sheet, Embedded and extraneous several data communication interface.By the configuration software of CMC, carry out the programming of logic control program and motion control program, by communication interface, download in CMC sheet and store, and directly operation; According to user's program, the signal of input is processed to computing, and carry out corresponding signal output, to complete control function.
Tool of the present invention has the following advantages:
1. be widely used: can be applied to the fields such as ammeter, water meter, gas meter, flow meter.
2. low-power consumption: CMC chip of the present invention has low-power consumption mode, can reach several microamperes of electrostatic currents under dormant state.
3. high reliability: module of the present invention is used channel hopping technology in wireless communication procedure, can adapt to various severe industrial environments.System bulk is reduced, weight saving, extension line and pad reduce, and the life-span increases, and reliability improves, and performance strengthens, and is convenient to large-scale production.Its packaging density can improve tens times even several thousand times than common fastener, and the stable work time of equipment also can improve greatly
4. low cost: the present invention uses radio communication, without wiring, has saved construction and wiring cost.
5. can networking: the present invention can be set up a short distance industry wireless network, is easy to scene to carry out network management and monitoring.
Accompanying drawing explanation
Fig. 1 is hardware block diagram of the present invention.
Fig. 2 is hardware platform CMC chip core circuit theory diagrams.
Fig. 3 is hardware platform radio circuit schematic diagram.
Fig. 4 is hardware platform CMC chip and radio frequency chip interface framework.
Fig. 5 is hardware platform serial port circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing Fig. 1-5, couple the present invention is described in further detail.
A kind of based on CMC(Control Module on Chip, CMC) the low power consumption wireless meter reading collector of chip, comprising: CMC chip, serial port circuit, RS485 interface circuit, radio frequency chip;
Described CMC chip is connected with radio frequency chip by SPI data-interface;
Described CMC chip is connected with serial port circuit, is also connected with RS485 interface circuit;
Described CMC chip is provided with crystal oscillator clock;
Described radio frequency chip is provided with crystal oscillator clock.
Radio protocol stack software is stored in the storer of CMC chip, as bottom firmware.Application program runs on this firmware.By wireless radio frequency circuit, realize the transmission of information, complete the functions such as networking, data transmission, network monitor and maintenance that application program and protocol stack firmware realize.By various data acquisition circuits, realize the collection of industrial data, complete the functions such as data transmission, forwarding, demonstration and control that application program and protocol stack firmware realize.
Described CMC chip is realized the management and running between routine processes and the program that realizes logic control and motion control in sheet, realizes the processing of controlling relevant analog quantity, digital quantity signal in sheet, Embedded and extraneous several data communication interface.By the configuration software of CMC, carry out the programming of logic control program and motion control program, by communication interface, download in CMC sheet and store, and directly operation; According to user's program, the various signals (comprising the signal importing into from communication interface) of input are processed to computing, and carry out corresponding signal output, to complete control function.
Described wireless radio frequency circuit comprises:
Radio frequency chip, sends in the air for realizing the data that chip is sent to buffer memory, or receives aerial wireless data in the reception buffer memory in chip.
Crystal oscillator clock, produces crystal oscillation, for radio frequency chip work provides timeticks.
Between CMC chip and radio frequency chip, adopt spi bus to carry out data communication, CMC chip is configured to main frame by pin PA4, PA5, PA6, PA7, radio frequency chip is configured to slave by pin SI, SO, SCLK and CSn, pin CSn pin is set to high level and guarantees that unsteady variation can not occur in input when transformer cuts out, and pin SI and pin SLCK are set to fixed level in order to avoid the variation of floating occurs in input; CMC chip and radio frequency chip are by being used SPI data-interface to complete read-write cache data, and address and data transmission all on SPI data-interface are all that most significant digit significance bit first sends.
Between CMC chip and radio frequency chip, adopt 4 lines to carry out the state control of radio frequency chip, the SFD pin of CMC chip connection radio frequency chip is caught the arrival of rf data; The CCA pin that CMC chip connects radio frequency chip carries out the idle assessment of radio-frequency channel; FIFO pin and FIFOP pin that CMC chip connects radio frequency chip carry out reception and the transmission of rf data.
RS485 interface circuit mainly completes conversion and the driving between Transistor-Transistor Logic level and other level, to reach with equipment (as PC, handheld device etc.), carries out data communication.
CMC chip is connected with serial port circuit by UART control unit interface pin; By serial port circuit, carry out data interaction with PC or handheld device and communicate by letter, complete module and prepare to add some information and the parameter configuration before network, to make module can correctly add wireless network normal work.
CMC chip carries out data interaction by the RS485 interface of standard with instrumentation communicates by letter, and completes the data acquisition to instrumentation, the operations such as control.
CMC chip single-chip microcomputer includes 256K FLASH and 64K RAM storage space, C6, and C7, C8, C9, Y1, Y2 has formed single-chip microcomputer crystal oscillating circuit, makes normally starting of oscillation work of single-chip microcomputer.R13, C7, S1 have formed the reset circuit of single-chip microcomputer.Radio protocol stack software is kept at as bottom firmware in the FLASH of CMC chip, and application program runs on radio protocol stack, and it can do accordingly and write according to connected data acquisition circuit.
Referring to Fig. 3, radio circuit adopts CC2420 radio frequency chip, it be a truly meet IEEE802.15.4 protocol specification, be applied to the low-power consumption in wireless network, the rf chip of low-voltage.It comprises the baseband modem of digital direct sequence spread spectrum, and output gain amplifier is 9dB, and data transmission rate can reach 250bps.C32, C33 and Y4 form the crystal oscillating circuit of radio circuit work, and CC2420 can normally be worked.L61, L62, L81, C25, C26, C27, C30 and antenna ANT form the actual transmission circuit of radio circuit, by it, data transmission are arrived in the air, and receive the rf data coming in the air.Other electric capacity are mainly used in the filtering of CC2420, strengthen anti-interference.
Between CMC chip and radio frequency chip (CC2420), adopt spi bus to carry out data communication, CMC chip is configured to main frame by pin PA4, PA5, PA6, PA7, radio frequency chip is configured to slave by pin SI, SO, SCLK and CSn, CSn pin is set to high level and guarantees that unsteady variation can not occur in input when transformer cuts out, and SI and SLCK pin must be set to fixed level in order to avoid the variation of floating occurs in input.
Between CMC chip and radio frequency chip, adopt 4 lines to carry out the state control of radio frequency chip, the SFD pin of the PA3 pin connection radio frequency chip of CMC chip is caught the arrival of rf data; The CCA pin that the PA2 pin of CMC chip connects radio frequency chip carries out the idle assessment of radio-frequency channel; The PA of CMC chip is connected radio frequency chip FIFO and FIFOP pin with PA1 pin carry out reception and the transmission of rf data.
After rf data arrives, radio frequency chip is caught rising edge triggering for generating physical data frame and is arrived (SFD) interruption after receiving, in this interruption, carry out Address Recognition and CRC check, if failed abandon this frame, if successfully receive after a complete Frame, FIFP pin produces high level, trigger data receives (FIFOP) and interrupts, the data that CMC receives radio frequency chip in buffer memory (RXFIFO) by spi bus are read in local cache, CMC chip is processed and is received data, forward or pass through network, 232 buses, other forms such as 485 buses are delivered to monitoring client and are shown, monitoring.
When CMC chip need to send data to when aerial, its first by data buffer storage in this locality, then use spi bus interface that data are read in radio frequency chip and sent in buffer memory (TXFIFO), the transmission order that use detects with CCA sends data, if channel busy, send order and ignore, again etc. to be sent, otherwise represent to send successfully.The upper all addresses of SPI and data transmission are all that most significant digit significance bit first sends.
Referring to Fig. 5, serial port circuit chip drives, what serial port circuit chip was used is this RS232 driver of MAX3221, its operating voltage is 3.3V, has low standby current (representative value is 1uA).The peripheral drive circuit of C19, C20, C21, C22 composition serial port circuit, use DB9 female is carried out the physical connection with external unit.After collector powers on, use the parameter configuration before PC or handheld device are moved to collector by serial port circuit.
Claims (8)
1. the low power consumption wireless meter reading collector based on CMC chip, is characterized in that:
Comprise: CMC chip, serial port circuit, RS485 interface circuit, radio frequency chip;
Described CMC chip is connected with radio frequency chip by SPI data-interface;
Described CMC chip is connected with serial port circuit, is also connected with RS485 interface circuit;
Described CMC chip is provided with crystal oscillator clock;
Described radio frequency chip is provided with crystal oscillator clock.
2. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
Described CMC chip is realized the management and running between routine processes and the program that realizes logic control and motion control in sheet, realizes the processing of controlling relevant analog quantity, digital quantity signal in sheet, Embedded and extraneous several data communication interface; By the configuration software of CMC, carry out the programming of logic control program and motion control program, by communication interface, download in CMC sheet and store, and directly operation; According to user's program, the signal of input is processed to computing, and carry out corresponding signal output, to complete control function.
3. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that: described wireless radio frequency circuit comprises:
Radio frequency chip, sends in the air for realizing the data that chip is sent to buffer memory, or receives aerial wireless data in the reception buffer memory in chip;
Crystal oscillator clock, produces crystal oscillation, for radio frequency chip work provides timeticks.
4. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
Between CMC chip and radio frequency chip, adopt spi bus to carry out data communication, CMC chip is configured to main frame by pin PA4, PA5, PA6, PA7, radio frequency chip is configured to slave by pin SI, SO, SCLK and CSn, pin CSn pin is set to high level and guarantees that unsteady variation can not occur in input when transformer cuts out, and pin SI and pin SLCK are set to fixed level in order to avoid the variation of floating occurs in input; CMC chip and radio frequency chip are by being used SPI data-interface to complete read-write cache data, and address and data transmission all on SPI data-interface are all that most significant digit significance bit first sends.
5. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
Between CMC chip and radio frequency chip, adopt 4 lines to carry out the state control of radio frequency chip, the SFD pin of CMC chip connection radio frequency chip is caught the arrival of rf data; The CCA pin that CMC chip connects radio frequency chip carries out the idle assessment of radio-frequency channel; FIFO pin and FIFOP pin that CMC chip connects radio frequency chip carry out reception and the transmission of rf data.
6. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
RS485 interface circuit mainly completes conversion and the driving between Transistor-Transistor Logic level and other level, to reach with equipment, carries out data communication.
7. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
CMC chip is connected with serial port circuit by UART control unit interface pin; By serial port circuit, carry out data interaction with PC or handheld device and communicate by letter, complete module and prepare to add some information and the parameter configuration before network, to make module can correctly add wireless network normal work.
8. according to the low power consumption wireless meter reading collector based on CMC chip claimed in claim 1, it is characterized in that:
CMC chip carries out data interaction by the RS485 interface of standard with instrumentation communicates by letter, and completes the data acquisition to instrumentation, the operations such as control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410006110.9A CN103761849A (en) | 2014-01-03 | 2014-01-03 | CMC (control module on chip)-chip-based low-power-consumption wireless meter reading acquirer |
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| CN201410006110.9A CN103761849A (en) | 2014-01-03 | 2014-01-03 | CMC (control module on chip)-chip-based low-power-consumption wireless meter reading acquirer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105357822A (en) * | 2015-11-11 | 2016-02-24 | 浙江中控研究院有限公司 | Intelligent home control system and control method thereof |
| CN105373038A (en) * | 2015-11-11 | 2016-03-02 | 浙江中控研究院有限公司 | Programmable analog input module |
| CN105891620A (en) * | 2014-11-17 | 2016-08-24 | 机械工业仪器仪表综合技术经济研究所 | Test system used for testing CMC chip electromagnetic compatibility radiation characteristic |
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Cited By (3)
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Application publication date: 20140430 |