CN203786221U - Energy efficiency data acquisition terminal possessing two RS485 interfaces - Google Patents

Energy efficiency data acquisition terminal possessing two RS485 interfaces Download PDF

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Publication number
CN203786221U
CN203786221U CN201420132072.7U CN201420132072U CN203786221U CN 203786221 U CN203786221 U CN 203786221U CN 201420132072 U CN201420132072 U CN 201420132072U CN 203786221 U CN203786221 U CN 203786221U
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module
pin
interface
connects
data acquisition
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CN201420132072.7U
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Chinese (zh)
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张河林
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East Fujian Long-Range Instrument Co Ltd
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East Fujian Long-Range Instrument Co Ltd
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Abstract

Embodiments of the utility model disclose an energy efficiency data acquisition terminal possessing two RS485 interfaces. The terminal comprises a CPU module, a pressure sensing module, a flow sensing module, an analog-to-digital AD conversion module, an Ethernet interface, an RS232 interface, an infrared module, a USB interface, a button input module, a liquid crystal display screen and an electric quantity acquisition module. The CPU module adopts an embedded ARM microprocessor with a model of AT91RM9200, wherein the microprocessor is produced by an ATMEL company. Further, the two RS485 interfaces which are backups for each other are included. An output terminal of the AD conversion module is connected to an AT91RM9200 through a SPI bus. The terminal adopts the high-performance embedded ARM microprocessor and simultaneously adopts the RS485 interfaces of the double backups so that equipment carries out 485 communication and reliability of the 485 communication of the energy efficiency data acquisition terminal is ensured.

Description

A kind of energy-efficiency data acquisition terminal with two-way RS485 interface
Technical field
The utility model belongs to energy monitoring equipment technical field, relates to especially a kind of energy-efficiency data acquisition terminal with two-way RS485 interface.
Background technology
Efficiency refers to the actual ratio of exerting oneself with the energy of actual consumption of equipment.It and equipment self efficiency, the factors such as working point, transmission loss are relevant.Existing realization in technology, can be by measuring equipment power consumption and equipment are exerted oneself respectively, again equipment power consumption and equipment are exerted oneself and is concentrated to the processing that certain server is concentrated, such processing mode can make efficiency data acquisition real-time not, and for server, because process a large amount of data, there is the not high problem of efficiency and accuracy.For the Real-time Collection of realizing efficiency, difficult point is equipment energy Source Data Acquisition, comparatively ripe for the acquisition technique of electric weight.
Energy-efficiency data acquisition terminal is as data collection station time, need to there is the intelligent instrument of 485 data feedback channels with other by the similar energy source data acquisition terminal of cascade, therefore the necessary setting of carrying out 485 interfaces, but only arrange road 485 interfaces will be to equipment in interface operation troubles between digital received and sent impact, the therefore real backup setting that is necessary to carry out RS485 interface.
Utility model content
For addressing the above problem, the purpose of this utility model is to provide a kind of energy-efficiency data acquisition terminal with two-way RS485 interface, in order to pass through to adopt high performance embedded-type ARM microprocessor, make gathering electric weight and can in source data, can carry out obtaining of energy efficiency of equipment, adopt the RS485 interface of double copies to carry out 485 communications for equipment simultaneously, guaranteed the reliability of energy source data acquisition terminal 485 communications.
For achieving the above object, the technical solution of the utility model is:
A kind of energy-efficiency data acquisition terminal with two-way RS485 interface, comprise CPU module, pressure sensitive module, flow sensing module, modulus AD modular converter, Ethernet interface, RS232 interface, infrared module, USB interface, keyboard input module, LCDs, and electric quantity acquisition module, the embedded-type ARM microprocessor that the model that described CPU module adopts atmel corp to produce is AT91RM9200, further comprise mutually redundant two-way RS485 interface circuit, the output terminal of described pressure sensitive module connects AD modular converter Yi road input end, the output terminal of described flow sensing module connects another road input end of AD modular converter, the output terminal of AD modular converter is connected with AT91RM9200 by spi bus, the electric current that described electric quantity acquisition module gathers is connected with the input end of AT91RM9200 with voltage signal output end, described Ethernet interface, RS232 interface, infrared module, USB interface connects Ethernet interface corresponding to AT91RM9200, RS232 interface, infrared module, USB interface end, the output terminal of the described keyboard input module arranging for the parameter of energy source data acquisition terminal connects the input end of AT91RM9200 by universal serial bus, the output terminal of described AT91RM9200 is connected and is used for showing parameter, current pressure and the data on flows of setting, the described LCD MODULE of the value of energy source signal by universal serial bus.
Preferably, the structure of single channel RS485 interface circuit is as follows, adopt SN65LBC184D as master chip, 1 pin R0 receiving end connects the data receiver of CPU module by the first light-coupled isolation unit, 4 pin DI transmitting terminals connect the data sending terminal of CPU module by the second light-coupled isolation unit, enable module connects pin two and 3 automatically; 6 pins connect 485 bus A ends; 7 pins connect the B end of 485 buses.
Preferably, further comprise and the GPRS module of the separated setting of CPU module place mainboard, described GPRS module is connected with mainboard by row's pin.
Preferably, the M590 that the side of having of described GPRS module employing double frequency clear data wireless industrial module produces is as master chip.
Preferably, described pressure sensitive module further comprises pressure transducer, the first pull-up resistor and the first operational amplifier, described pressure transducer has the standard current signal output port of 4~20mA, the standard current signal output terminal of described pressure transducer inputs to the first operational amplifier after being connected in series the first pull-up resistor, the output terminal of the first operational amplifier connects AD modular converter Yi road input end
Preferably, described flow sensing module further comprises flowmeter, the second pull-up resistor and the second operational amplifier, described flowmeter has the standard current signal output port of 4-20mA, the standard current signal output terminal of flowmeter inputs to the second operational amplifier after being connected in series the second pull-up resistor, the output terminal of the second operational amplifier connects another road input end of AD modular converter
Preferably, described AD modular converter adopts the A/D converter AD73360 of 16, six passage.
Preferably, the 1st pin VINP2 of described AD73360 is connected the output terminal of the first operational amplifier as a road input end with the 2nd pin VINN1; The 3rd pin VINP1 is connected the output terminal of the second operational amplifier as another road input end with the 4th pin VINN1; The first capacitor C 1 of the 6th pin REFCAP serial connection one end ground connection; The 7th pin ADD2 connects 3.3V power supply simultaneously and connects the second capacitor C 2 of one end ground connection; The first resistance R 1 of the 8th pin AGND2 serial connection one end ground connection; The 9th pin DGND ground connection; The 10th pin DVDD also connects the 3rd capacitor C 3 of one end ground connection and the second resistance R 2 that the 4th capacitor C 4 is connected in series a termination 3.3V power supply simultaneously, the 3rd resistance and the 5th capacitances in series, the other end of the 3rd resistance connects 3.3V power supply, and the 5th electric capacity other end connects the earth terminal of the 3rd electric capacity and the 4th electric capacity; The 11st pin RESET connects the 4th resistance while of a termination 3.3V voltage and connects the 6th electric capacity of one end ground connection; The 13rd pin MCLK connects the 7th electric capacity of one end ground connection; The 14th pin connects the PA1 pin of AT91RM9200; The 17th pin connects the PA0 pin of AT91RM9200; The 18th pin SE is connected in series the 5th resistance of a termination 3.3V power supply; The 20th pin AVDD1 connects 3.3V power supply and is connected in series the 8th electric capacity and the 9th electric capacity of one end ground connection.
Compared with prior art, the utlity model has following beneficial effect:
(1) by the RS485 interface of double copies is set, for equipment, carry out 485 communications, guaranteed the reliability of energy source data acquisition terminal 485 communications;
(2) by adopting the clear data GSM/GPRS wireless module of the special double frequency for commercial Application, can provide the teledata upload function of high-accuracy stable;
(3) mode that GPRS module adopts contact pin to be connected with mainboard arranges, and makes dismounting and keeps in repair more convenient;
(4), by adopting high performance embedded-type ARM microprocessor AT91RM9200, by simple peripheral circuit, can realize the processing accuracy of multichannel data acquisition and raising energy source data;
(5) adopt the AD modular converter of modular design, when the energy source data that system is detected at need changes, only need corresponding interpretive model be set in CPU module can obtain corresponding energy signal, without the change of carrying out on hardware;
(6) collection that the similar AD modular converter of AD modular converter using in employing and energy data acquisition module obtains electric quantity data, makes the realization of circuit structure more simple;
(7) energy efficiency acquisition terminal can possess electric quantity acquisition simultaneously, can Source Data Acquisition and the multiple efficacies of efficiency data acquisition, greatly saved user's cost.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment;
Fig. 2 is the circuit pin block diagram of AT91RM9200PQFP embedded-type ARM microprocessor of CPU module of the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment;
Fig. 3 is the circuit structure diagram of RS485 interface of the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment;
Fig. 4 is the circuit diagram of GPRS module of the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment;
Fig. 5 is the circuit diagram of AD modular converter of the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
On the contrary, the utility model contain any by claim, defined in marrow of the present utility model and scope, make substitute, modification, equivalent method and scheme.Further, for the public is had a better understanding to the utility model, in below details of the present utility model being described, detailed some specific detail sections of having described.Do not have for a person skilled in the art the description of these detail sections can understand the utility model completely yet.
Referring to Fig. 1, be depicted as the structured flowchart of the energy source data acquisition terminal with two-way RS485 interface of the utility model embodiment, it comprises CPU module 101, pressure sensitive module 102, flow sensing module 103, modulus AD modular converter 111, Ethernet interface 104, RS232 interface 106, infrared module 107, usb 1 08, keyboard input module 109, LCDs 110, and electric quantity acquisition module 112, the embedded-type ARM microprocessor that the model that wherein CPU module 101 adopts atmel corp to produce is AT91RM9200, Fig. 2 is the circuit pin block diagram of AT91RM9200PQFP embedded-type ARM microprocessor, further comprise mutually redundant two-way RS485 interface circuit 112, the output terminal of pressure sensitive module 102 connects AD modular converter 111 mono-road input end, the output terminal of flow sensing module 103 connects another road input end of AD modular converter 111, the output terminal of AD modular converter 111 is connected with AT91RM9200 by spi bus, Ethernet interface 104, RS232 interface 106, infrared module 107, Ethernet interface corresponding to the two-way connection AT91RM9200 of usb 1 08, RS232 interface, infrared module, the interface end of USB interface, the output terminal of the keyboard input module 109 arranging for the parameter of energy source data acquisition terminal connects the input end of AT91RM9200 by universal serial bus, the electric current that electric quantity acquisition module 112 gathers is connected with the input end of AT91RM9200 with voltage signal output end, the output terminal of AT91RM9200 is connected and is used for showing parameter, current pressure and the data on flows of setting, the described LCD MODULE of the value of energy source signal by universal serial bus.Its course of work is as follows: wherein RS232 interface 106, infrared module 107, and usb 1 08 is for this locality debugging of energy source data acquisition terminal.Pressure sensitive module 102 is for source data signals comprising vapour, gas, the collection of the pressure criteria current signal of oil also converts thereof into the voltage signal that can input to AD modular converter, flow sensing module 103 is for source data packet drawing together vapour, gas, the collection of the flow standard current signal of oil also converts thereof into the voltage signal that can input to AD modular converter, AD modular converter 111 is for converting the current signal that characterizes pressure and flow to digital signal, CPU module is for processing digital signal, mainly that pressure signal and flow signal are carried out, after product, time integral is multiplied by a constant again, can source data signals thereby obtain.Electric quantity acquisition module collects the electricity consumption data of equipment, by CPU module, the energy source data signals of equipment and electricity consumption data is got along and can be obtained the efficiency data of equipment.Ethernet interface 104 is for adopting the mode of wire cable that the server to being placed on Internet network of the energy source data collecting is transmitted, and RS485 interface module can have the intelligent instrument of 485 data feedback channels with other by the similar energy source data acquisition terminal of cascade.
The energy-efficiency data acquisition terminal with two-way RS485 interface of above embodiment, carries out 485 communications by the RS485 interface of double copies is set for equipment, has guaranteed the reliability of energy source data acquisition terminal 485 communications.
Referring to Fig. 3, be depicted as the structural drawing of single channel RS485 interface circuit in a concrete application example, adopt SN65LBC184D as master chip, 1 pin R0 receiving end connects the data receiver of CPU module by the first light-coupled isolation unit, 4 pin DI transmitting terminals connect the data sending terminal of CPU module by the second light-coupled isolation unit, enable module connects pin two and 3 automatically; 6 pins connect 485 bus A ends; 7 pins connect the B end of 485 buses.Light-coupled isolation unit is for electrical isolation, and protection CPU module, prevents the damage of CPU module.
In other application example, the energy source data acquisition terminal with two-way RS485 interface further comprises and the GPRS module 105 of the separated setting of CPU module place mainboard, and GPRS module 105 is connected with mainboard by row's pin.In a concrete Application Example, referring to Fig. 4, be the circuit diagram of GPRS module of the remote meter reading energy source data acquisition terminal based on GPRS of the utility model embodiment, known GPRS module adopts the side of the having M590 of double frequency clear data wireless industrial module as master chip.Wherein, 2,3 pin VCC_MAIN are module primary power input end; 5 pin LIGHT are duty indication pin, and the collector by a triode V6 on this pin connects a green LED, and the conducting of controlling LED by V6 is used to indicate GPRS module duty; 7 pin RXD are that module is accepted data terminal, by a triode V2, control conducting or the shutoff of a two-color diode, 8 pin TXD are that module transmission data are controlled conducting or the shutoff of a two-color diode by a triode V1, two-color diode flicker is used to indicate the data transmit-receive state of GPRS, 14 pin SIMVCC are SIM card power supply output pin, 1,1 ' pin and 4, the 4 ' pin of the SIM card module that connection model is LK-1016; 18 pin EMERGOFF are emergency cutoff pin, connect a triode V5 and control its emergency cutoff, and 19 pin ON/OFF are that pin is controlled in switching on and shutting down, and low level start, controls its switching on and shutting down by a triode V4.Meanwhile, M590 is connected with mainboard by 15X2 contact pin with sim card slot.By above GPRS module, can realize the remote meter reading of far-end server to energy source data acquisition terminal.
In a concrete Application Example, pressure sensitive module further comprises pressure transducer, the first pull-up resistor and the first operational amplifier, pressure transducer has the standard current signal output port of 4~20mA, the standard current signal output terminal of described pressure transducer inputs to the first operational amplifier after being connected in series the first pull-up resistor, the output terminal of the first operational amplifier connects AD modular converter Yi road input end, by the first pull-up resistor and operational amplifier, can convert the standard current signal of pressure transducer output to voltage signal.
In a concrete Application Example, flow sensing module further comprises flowmeter, the second pull-up resistor and the second operational amplifier, flowmeter has the standard current signal output port of 4-20mA, the standard current signal output terminal of flowmeter inputs to the second operational amplifier after being connected in series the second pull-up resistor, the output terminal of the second operational amplifier connects another road input end of AD modular converter, by the first pull-up resistor and operational amplifier, can convert the standard current signal of pressure transducer output to voltage signal.
In a concrete application example, AD modular converter adopts the A/D converter AD73360 of 16, six passage, shown in Figure 5 is the circuit diagram of AD modular converter, and the 1st pin VINP2 of AD73360 is connected the output terminal of the first operational amplifier as a road input end with the 2nd pin VINN1; The 3rd pin VINP1 is connected the output terminal of the second operational amplifier as another road input end with the 4th pin VINN1; The first capacitor C 1 of the 6th pin REFCAP serial connection one end ground connection; The 7th pin ADD2 connects 3.3V power supply simultaneously and connects the second capacitor C 2 of one end ground connection; The first resistance R 1 of the 8th pin AGND2 serial connection one end ground connection; The 9th pin DGND ground connection; The 10th pin DVDD also connects the 3rd capacitor C 3 of one end ground connection and the second resistance R 2 that the 4th capacitor C 4 is connected in series a termination 3.3V power supply simultaneously, the 3rd resistance R 3 is connected with the 5th capacitor C 5, the other end of the 3rd resistance R 3 connects 3.3V power supply, and the 5th capacitor C 5 other ends connect the earth terminal of the 3rd capacitor C 3 and the 4th capacitor C 4; The 11st pin RESET connects the 4th 4 whiles of resistance R of a termination 3.3V voltage and connects the 6th capacitor C 6 of one end ground connection; The 13rd pin MCLK connects the 7th capacitor C 7 of one end ground connection; The 14th pin connects the PA1 pin of AT91RM9200; The 17th pin connects the PA0 pin of AT91RM9200; The 18th pin SE is connected in series the 5th resistance R 5 of a termination 3.3V power supply; The 20th pin AVDD1 connects 3.3V power supply and is connected in series the 8th capacitor C 8 and the 9th capacitor C 9 of one end ground connection.AD73360 has six passage A/D converters, the equal synchronized sampling of each passage with guarantee interchannel hardly life period (phase place) postpone, therefore applicable multichannel analog input.By the AD modular converter of above setting, can convert pressure signal and flow signal to CPU module accessible signal.
The technology of electric quantity acquisition is comparatively ripe, so the utility model embodiment does not repeat them here.In specific implementation process, the AD modular converter of its use also can be referring to implementation described above, make the AD modular converter of the utility model embodiment can modularization, both applicable to the AD conversion in electric quantity acquisition, also applicable to the AD conversion in energy Source Data Acquisition, realize, line voltage, electric current on power panel are passed through respectively to resistance pressure-dividing network, current transformer (TA) and resistance sampling network and carry out signal condition, then complete three-phase voltage, the sampling of current signal real-time synchronization through 6 Channel Synchronous ADC converter AD73360L.The conditioning of voltage, current analog signal is realized by resistance pressure-dividing network and TA resistance sampling network respectively, obtains moderate conditioned signal, according to A/D input requirements, adjusts signal and answers 800mV.For effectively suppressing the impact of high-frequency electromagnetic undesired signal on data sampling, identical RC low-pass filter (the cutoff frequency 1591Hz of rear class access parameter of voltage, current regulating passage, meet 21 subharmonic samplings), keep the phase differential between sampling front and back voltage, electric current consistent.Sampled data is delivered to embedded microprocessor data processing unit, electric current, voltage waveform data are carried out to spectrum analysis, isolate fundametal compoment and each harmonic component, its high speed processing ability of relying on completes the tasks such as electric parameter metering, frequency analysis, harmonic electric energy metering.
The energy source data acquisition terminal more than arranging, by adopting the AT91RM9200 of the system building around ARM920T ARM Thumb processor completely, there is abundant system and the interface of applying peripheral hardware and standard, thereby the solution of a kind of low-power consumption, low cost, high-performance monolithic energy source data acquisition terminal is provided.AT91RM9200 is integrated many standard interfaces, comprise USB2.0 at full speed main frame and device port and with most peripheral hardwares with in the widely used 10/100Base-T Ethernet of network layer MAC controller (MAC), in addition, it also provides a series of peripheral hardwares that meet industrial standard, can in audio frequency, telecommunications, the outside line of Flash carminum and smart card, use, make conveniently to add RS232 interface 106 as above, infrared module 107, usb 1 08, GPRS module 105 and Ethernet interface 104.The energy source data acquisition terminal arranging by above employing AT91RM9200, circuit structure is simple, and data processing function is powerful.
One specifically should example in, the energy-efficiency data acquisition terminal with two-way RS485 interface of the utility model embodiment is for gathering the efficiency of water pump.It gathers the flow AI1 of water pump simultaneously, top hole pressure AI2, intake pressure AI3, in the CPU of acquisition terminal inside, water delivery side of pump is multiplied by flow AI1 to the pressure differential of import (AI2-AI3), again to time integral, be exactly exerting oneself of water pump: P=∫ (AI2-AI3) * AI1*dt, water pump electricity consumption data Q, the efficiency of water pump is η=P/Q.It has RS485 interface can have the intelligent instrument of 485 data feedback channels with other by the similar energy source data acquisition terminal of cascade, simultaneously by GPRS interface, the electricity consumption data Q of equipment, energy source data P, and efficiency η is uploaded to the data server of far-end with wireless mode.
In another concrete application example, be applied to the energy-efficiency data acquisition terminal with two-way RS485 interface that blower fan is exerted oneself, flowmeter adopts the vortex precession flowmeter with the output of 4-20mA standard current signal to carry out the detection of air mass flow, those skilled in that art it should be understood that, in addition, as adopt orifice plate to add differential flow converter, vortex shedding flow meter, Annular Round Model PFB, thermal gas flowmeter, the flowmeter that is applicable to air mass flow detection that mass flowmeter has the output of 4-20mA standard current signal can be used in the utility model embodiment.Pressure transducer is used for measuring the air pressure of blower fan, AD modular converter one tunnel gathers the flow signal of flowmeter, one tunnel is used for gathering pressure signal, embedded untreated device inside modules is carried out time integral and is multiplied by efficiency constant by flow and pressure, can obtain the energy signal that blower fan is exerted oneself, by electric quantity acquisition module, obtain again again the power consumption of blower fan simultaneously, can the real-time efficiency data that calculate blower fan.It has RS485 interface can have the intelligent instrument of 485 data feedback channels with other by the similar energy source data acquisition terminal of cascade, simultaneously by GPRS interface, the electricity consumption data of equipment, energy source data, and efficiency can be uploaded to by GPRS interface the data server of far-end with wireless mode.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (8)

1. an energy-efficiency data acquisition terminal with two-way RS485 interface, it is characterized in that, comprise CPU module, pressure sensitive module, flow sensing module, modulus AD modular converter, Ethernet interface, RS232 interface, infrared module, USB interface, keyboard input module, LCDs, and electric quantity acquisition module, the embedded-type ARM microprocessor that the model that described CPU module adopts atmel corp to produce is AT91RM9200, further comprise mutually redundant two-way RS485 interface circuit, the output terminal of described pressure sensitive module connects AD modular converter Yi road input end, the output terminal of described flow sensing module connects another road input end of AD modular converter, the output terminal of AD modular converter is connected with AT91RM9200 by spi bus, the electric current that described electric quantity acquisition module gathers is connected with the input end of AT91RM9200 with voltage signal output end, described Ethernet interface, RS232 interface, infrared module, USB interface connects Ethernet interface corresponding to AT91RM9200, RS232 interface, infrared module, USB interface end, the output terminal of the described keyboard input module arranging for the parameter of energy source data acquisition terminal connects the input end of AT91RM9200 by universal serial bus, the output terminal of described AT91RM9200 is connected and is used for showing parameter, current pressure and the data on flows of setting, the described LCD MODULE of the value of energy source signal by universal serial bus.
2. the energy-efficiency data acquisition terminal with two-way RS485 interface according to claim 1, it is characterized in that, the structure of single channel RS485 interface circuit is as follows, adopt SN65LBC184D as master chip, 1 pin R0 receiving end connects the data receiver of CPU module by the first light-coupled isolation unit, 4 pin DI transmitting terminals connect the data sending terminal of CPU module by the second light-coupled isolation unit, enable module connects pin two and 3 automatically; 6 pins connect 485 bus A ends; 7 pins connect the B end of 485 buses.
3. the energy-efficiency data acquisition terminal with two-way RS485 interface according to claim 1, is characterized in that, further comprises and the GPRS module of the separated setting of CPU module place mainboard, and described GPRS module is connected with mainboard by row's pin.
4. the energy-efficiency data acquisition terminal with two-way RS485 interface according to claim 3, is characterized in that, the M590 that the side of having of described GPRS module employing double frequency clear data wireless industrial module produces is as master chip.
5. the energy-efficiency data acquisition terminal with two-way RS485 interface according to claim 1, it is characterized in that, described pressure sensitive module further comprises pressure transducer, the first pull-up resistor and the first operational amplifier, described pressure transducer has the standard current signal output port of 4~20mA, the standard current signal output terminal of described pressure transducer inputs to the first operational amplifier after being connected in series the first pull-up resistor, and the output terminal of the first operational amplifier connects AD modular converter Yi road input end.
6. according to the arbitrary described energy-efficiency data acquisition terminal with two-way RS485 interface of claim 1 to 5, it is characterized in that, described flow sensing module further comprises flowmeter, the second pull-up resistor and the second operational amplifier, described flowmeter has the standard current signal output port of 4-20mA, the standard current signal output terminal of flowmeter inputs to the second operational amplifier after being connected in series the second pull-up resistor, and the output terminal of the second operational amplifier connects another road input end of AD modular converter.
7. according to the arbitrary described energy-efficiency data acquisition terminal with two-way RS485 interface of claim 1 to 5, it is characterized in that, described AD modular converter adopts the A/D converter AD73360 of 16, six passage.
8. the energy-efficiency data acquisition terminal with two-way RS485 interface according to claim 7, is characterized in that, the 1st pin VINP2 of described AD73360 is connected the output terminal of the first operational amplifier as a road input end with the 2nd pin VINN1; The 3rd pin VINP1 is connected the output terminal of the second operational amplifier as another road input end with the 4th pin VINN1; The first capacitor C 1 of the 6th pin REFCAP serial connection one end ground connection; The 7th pin ADD2 connects 3.3V power supply simultaneously and connects the second capacitor C 2 of one end ground connection; The first resistance R 1 of the 8th pin AGND2 serial connection one end ground connection; The 9th pin DGND ground connection; The 10th pin DVDD also connects the 3rd capacitor C 3 of one end ground connection and the second resistance R 2 that the 4th capacitor C 4 is connected in series a termination 3.3V power supply simultaneously, the 3rd resistance and the 5th capacitances in series, the other end of the 3rd resistance connects 3.3V power supply, and the 5th electric capacity other end connects the earth terminal of the 3rd electric capacity and the 4th electric capacity; The 11st pin RESET connects the 4th resistance while of a termination 3.3V voltage and connects the 6th electric capacity of one end ground connection; The 13rd pin MCLK connects the 7th electric capacity of one end ground connection; The 14th pin connects the PA1 pin of AT91RM9200; The 17th pin connects the PA0 pin of AT91RM9200; The 18th pin SE is connected in series the 5th resistance of a termination 3.3V power supply; The 20th pin AVDD1 connects 3.3V power supply and is connected in series the 8th electric capacity and the 9th electric capacity of one end ground connection.
CN201420132072.7U 2014-03-24 2014-03-24 Energy efficiency data acquisition terminal possessing two RS485 interfaces Expired - Fee Related CN203786221U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105404257A (en) * 2015-12-01 2016-03-16 苏州新宏博智能科技股份有限公司 Modularized data acquisition apparatus
CN111262173A (en) * 2020-03-11 2020-06-09 重庆西威电气有限公司 Multifunctional display control instrument and power distribution cabinet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105404257A (en) * 2015-12-01 2016-03-16 苏州新宏博智能科技股份有限公司 Modularized data acquisition apparatus
CN111262173A (en) * 2020-03-11 2020-06-09 重庆西威电气有限公司 Multifunctional display control instrument and power distribution cabinet

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