CN206460302U - A kind of new device for detecting temperature being used in Distributed Environmental Monitoring System - Google Patents
A kind of new device for detecting temperature being used in Distributed Environmental Monitoring System Download PDFInfo
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- CN206460302U CN206460302U CN201720184650.5U CN201720184650U CN206460302U CN 206460302 U CN206460302 U CN 206460302U CN 201720184650 U CN201720184650 U CN 201720184650U CN 206460302 U CN206460302 U CN 206460302U
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- temperature
- chip microcomputer
- monitoring system
- new device
- environmental monitoring
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Abstract
The utility model discloses a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System, temperature acquisition terminal includes single-chip microcomputer, LCD display, keyboard, alarm, A/D change-over circuits, temperature sensing circuit, temperature sensing circuit includes integrated regulator, instrumentation amplifier, integrated regulator is connected with instrumentation amplifier, single-chip microcomputer is connected with LCD display respectively, keyboard, alarm, temperature sensing circuit is connected by A/D change-over circuits with single-chip microcomputer, single-chip microcomputer in temperature acquisition terminal is connected by the interfaces of RS 485 with temperature reception PC, the serial line interface of temperature reception PC is the interfaces of RS 232, level shifting circuit is connected between the interfaces of RS 232 and the interfaces of RS 485, temperature reception PC and LCD display, keyboard, alarm, printer is connected, the utility model is simple in construction, easily operation, monitoring temperature is accurately and reliably, cost is low, can collecting temperature in real time.
Description
Technical field
The utility model is related to environment temperature monitoring technical field, and specifically a kind of new distributed environment that is used for is supervised
Device for detecting temperature in examining system.
Background technology
Heating area in the winter time, the indoor actual temperature of each cell is related to each family.It is small in order to understand
Actual temperature in compartment is, it is necessary to which personal monitoring gathers each resident family's indoor temperature to detect heating quality, it is to avoid due to Indoor Temperature
Spend the high unnecessary waste caused, and uneven heating it is even the problem of, reduction heating failure, but Traditional Man detection temperature
It is inaccurate, it is impossible to monitoring in real time, operate more troublesome and need the time.
Therefore, to overcome the shortcomings of that above-mentioned technology designs a simple in construction, easily operation, monitoring temperature accurately may be used
Lean on, cost is low, can collecting temperature in real time a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System, exactly
Inventor's problem to be solved.
Utility model content
In view of the shortcomings of the prior art, the purpose of this utility model is to provide a kind of new for distributed environment monitoring system
Device for detecting temperature in system, its is simple in construction, easily operation, and accurately and reliably, cost is low for monitoring temperature, and temperature can be gathered in real time
Degree.
The utility model solves the technical scheme that its technical problem used：A kind of new distributed environment that is used for is monitored
Device for detecting temperature in system, it includes multiple temperature acquisition terminals, temperature reception PC, the temperature acquisition terminal bag
Single-chip microcomputer, LCD display, keyboard, alarm, A/D change-over circuits, temperature sensing circuit, the temperature sensing circuit bag are included
Integrated regulator, instrumentation amplifier are included, the integrated regulator is connected with instrumentation amplifier, and the single-chip microcomputer is connected with respectively
LCD display, keyboard, alarm, the temperature sensing circuit are connected by A/D change-over circuits with single-chip microcomputer, and the temperature is adopted
Single-chip microcomputer in collection terminal is connected by RS-485 interfaces with temperature reception PC, and the serial line interface of the temperature reception PC is
Level shifting circuit, the temperature reception PC are connected between RS-232 interface, RS-232 interface and the RS-485 interface
It is connected to LCD display, keyboard, alarm, printer.
Further, the integrated regulator uses LM317 chips.
Further, the instrumentation amplifier uses AD620.
Further, the A/D change-over circuits select MAX187 chips.
Further, the RS-485 interface devices use MAX485 chips, TXD ends, the RXD ends of the serial port of single chip computer
It is connected with MAX485 RE and DE ends, A, B of the MAX485 are terminated with one 100 Ω resistance.
The beneficial effects of the utility model are：
1st, the utility model system uses master slave and distributed structure, simple in construction, easily operation, and monitoring temperature accurately may be used
Lean on, cost is low, can collecting temperature in real time, temperature reception PC communicates total using RS-485 serial line interfaces with temperature acquisition terminal room
Line, has the advantages that transmission rate is high, can hanging node, many, error-detection mechanism is reliable, using RS-232 and RS-485 interface signals
Feature, dexterously designs the level shifting circuit with interference free performance, and system has favorable expandability, high resolution, measurement
Scope is wide, the features such as strong interference immunity.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model temperature sensing circuit schematic diagram.
Fig. 3 is the utility model A/D change-over circuit schematic diagrams.
Fig. 4 is the change-over circuit schematic diagram of the utility model RS-232 and RS-485 interface level.
Fig. 5 is the communication interface of the utility model temperature acquisition terminal.
Embodiment
With reference to specific embodiment, the utility model is expanded on further, it should be appreciated that these embodiments are merely to illustrate this
Utility model rather than limitation scope of the present utility model.In addition, it is to be understood that reading the content of the utility model instruction
Afterwards, those skilled in the art can make various changes or modifications to the utility model, and these equivalent form of values also fall within application
Appended claims limited range.
It is the utility model structural representation referring to Fig. 1, the structure is a kind of new in Distributed Environmental Monitoring System
Device for detecting temperature, include multiple temperature acquisition terminals, temperature reception PC, temperature acquisition terminal include single-chip microcomputer,
LCD display, keyboard, alarm, A/D change-over circuits, temperature sensing circuit, temperature sensing circuit include integrated regulator,
Instrumentation amplifier, integrated regulator is connected with instrumentation amplifier, and single-chip microcomputer is connected with LCD display, keyboard, alarm respectively, temperature
Degree detection circuit is connected by A/D change-over circuits with single-chip microcomputer, the single-chip microcomputer in temperature acquisition terminal by RS-485 interfaces and
Temperature reception PC is connected, and the serial line interface of temperature reception PC is RS-232 interface, RS-232 interface and RS-485 interfaces it
Between be connected with level shifting circuit, temperature reception PC is connected to LCD display, keyboard, alarm, printer.
Multi-point remote system for detecting temperature uses Distributed Detection structure, is adopted by a temperature reception PC and multiple temperature
Collect terminal to constitute.Temperature acquisition terminal carries out real-time or timing acquiring according to the instruction of temperature reception PC to each point temperature, surveys
Amount result can not only be locally stored, show, and gathered data can be sent into temperature reception PC by universal serial bus；
Temperature reception PC sends control instruction, controls each temperature acquisition terminal to carry out temperature acquisition, collects temperature acquisition terminal and surveys
Data are measured, and measurement result is analyzed, handle, show and printed.Temperature reception PC part uses personal computer, temperature
The microprocessor for spending acquisition terminal uses AT89C55 single-chip microcomputers.
System can detect N roads temperature simultaneously, be carried out data transmission using RS-485 universal serial bus, transmission range is more than
1200m, strong antijamming capability；The temperature alarming upper limit value and lower limit value of each temperature acquisition terminal can be respectively set by temperature reception PC,
Temperature reception PC, temperature acquisition terminal are respectively provided with warning function；Can in real time, the data of each temperature acquisition terminal of timed collection.
It is the utility model temperature sensing circuit schematic diagram referring to Fig. 2, the temperature detection range of system is 0 DEG C~400 DEG C,
Select RTD PT100 as sensor, the measurement accuracy of RTD is higher, and the principle of RTD measurement temperature is by temperature
Change transitions are the change of resistance value, and dut temperature value can be conversed as long as measuring the resistance of RTD.Temperature sensing circuit
Using amplifier of electrical bridge, mainly it is made up of stabilized voltage device integrated LM317, electric bridge and instrumentation amplifier AD620.LM317 is used for electricity
Bridge circuit provides dc source, and Rt is the RTD PT100 being connected in electric bridge.
Temperature is divided to two grades to measure by the utility model, can improve measurement accuracy, when temperature is in 0 DEG C~210 DEG C
When, arm resistance where relay J1 is R32, the feedback resistance that relay J2 selections R5 is AD620；Temperature be in 195 DEG C~
At 400 DEG C, arm resistance where relay J1 is R31 connects with R32, the feedback resistance that relay J2 selections R6 is AD620.
System synchronous change multiplication factor when switching arm resistance, reaches the automatic purpose for changing range, improving measurement accuracy.
It is the utility model A/D change-over circuit schematic diagrams referring to Fig. 3, systematic survey is temperature signal, from 12 bit strings
Row A/D converter MAX187.MAX187 has the resolution ratio of 12.
It is the change-over circuit schematic diagram of the utility model RS-232 and RS-485 interface level referring to Fig. 4, RS-485's connects
Mouthpart part is more, and system uses MAX485 chips.The serial line interface that system temperature receives PC is RS-232, and RS-232 interface is adopted
With negative logic, wherein logic 1,0 is represented with -12 ,+12V level respectively, and RS-485 uses positive logic（Transistor-Transistor Logic level）, therefore must
RS-232 and RS-485 level conversion must be carried out.The resistance at RS-485 interface A, B ends is electric for the impedance matching of line end
Resistance.
Change-over circuit has used three photoelectrical couplers to be isolated, and can improve functional reliability.When RS-232 request
When sending signal RTS for negative logic 1, the light emitting diode of photoelectrical coupler is not lighted, and phototriode is not turned on, be output as+
5V (positive logic 1), now RS-485 DE ends effectively, the DI ends that RS-232 TXD ends just can be through photoelectrical coupler, RS-485
Send data；When RS-232 RTS ends are negative logic 0 (+12V), the lumination of light emitting diode of photoelectrical coupler, photosensitive three pole
Pipe is turned on, and is output as 0V (positive logic 0), now RS-485 RE is effective.When RS-485 RO ends are (the high electricity of TTL of positive logic 1
It is flat) when, photoelectrical coupler light emitting diode does not light, phototriode cut-off, because when RS-232, which is sent, to be stopped, TXD ends are electric
Put down as -12V, therefore electric capacity is charged to -12V, RXD ends are negative logic 1；When RS-485 RO ends are (the low electricity of TTL of positive logic 0
It is flat) when, photoelectrical coupler lumination of light emitting diode, phototriode conducting, the level for being sent to RXD ends is+5V, also in RS-232
In the level range of negative logic 0, as logical zero.Therefore, when negative logic 0 is in RS-232 RTS ends, a RS-485RO is realized
End data delivers to RS-232 RXD ends by photoelectrical coupler.
The utility model temperature reception PC is communicated with temperature acquisition terminal room using RS-485 serial interface bus, is had
Transmission rate is high, can hang the advantages of node is more, error-detection mechanism is reliable, the characteristics of using RS-232 with RS-485 interface signals, ingeniously
Level shifting circuit between the two is have devised wonderfully, and circuit anti-interference is good and is easily achieved.
It is the communication interface of the utility model temperature acquisition terminal referring to Fig. 5, because the signal of single-chip microcomputer is Transistor-Transistor Logic level,
MAX485 receiver output end RO, driver input end DI and Enable Pin RE, DE is Transistor-Transistor Logic level, therefore can be direct
The TXD ends of serial port of single chip computer, RXD ends are directly connected with MAX485 DI, RO end, and with a bit port line traffic control of single-chip microcomputer
MAX485 processed RE and DE ends, it is possible to realize the transmission and reception of temperature acquisition terminal.In order to realize the resistance of line end
Anti- matching, it is also desirable to terminate 100 Ω resistance in MAX485 A, B.
Claims (5)
1. a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System, it is characterised in that：It includes multiple
Temperature acquisition terminal, temperature reception PC, the temperature acquisition terminal include single-chip microcomputer, LCD display, keyboard, alarm,
A/D change-over circuits, temperature sensing circuit, the temperature sensing circuit include integrated regulator, instrumentation amplifier, described integrated
Voltage-stablizer is connected with instrumentation amplifier, and the single-chip microcomputer is connected with LCD display, keyboard, alarm, the temperature detection electricity respectively
Road is connected by A/D change-over circuits with single-chip microcomputer, and the single-chip microcomputer in the temperature acquisition terminal passes through RS-485 interfaces and temperature
PC connection is received, the serial line interface of the temperature reception PC is RS-232 interface, and the RS-232 interface connects with RS-485
Level shifting circuit is connected between mouthful, the temperature reception PC is connected to LCD display, keyboard, alarm, printing
Machine.
2. a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System according to claim 1, it is special
Levy and be：The integrated regulator uses LM317 chips.
3. a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System according to claim 1, it is special
Levy and be：The instrumentation amplifier uses AD620.
4. a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System according to claim 1, it is special
Levy and be：The A/D change-over circuits select MAX187 chips.
5. a kind of new device for detecting temperature being used in Distributed Environmental Monitoring System according to claim 1, it is special
Levy and be：The RS-485 interface devices use MAX485 chips, TXD ends, RXD ends and the MAX485 of the serial port of single chip computer
RE and DE ends connection, A, B of the MAX485 are terminated with one 100 Ω resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720184650.5U CN206460302U (en) | 2017-02-28 | 2017-02-28 | A kind of new device for detecting temperature being used in Distributed Environmental Monitoring System |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720184650.5U CN206460302U (en) | 2017-02-28 | 2017-02-28 | A kind of new device for detecting temperature being used in Distributed Environmental Monitoring System |
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| Publication Number | Publication Date |
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| CN206460302U true CN206460302U (en) | 2017-09-01 |
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| CN201720184650.5U Expired - Fee Related CN206460302U (en) | 2017-02-28 | 2017-02-28 | A kind of new device for detecting temperature being used in Distributed Environmental Monitoring System |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506005A (en) * | 2020-05-28 | 2020-08-07 | 西南交通大学 | Monitoring system based on PIC singlechip |
-
2017
- 2017-02-28 CN CN201720184650.5U patent/CN206460302U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506005A (en) * | 2020-05-28 | 2020-08-07 | 西南交通大学 | Monitoring system based on PIC singlechip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190717 Address after: 276000 Room 303, Building 3A, Famous Residence of Golden Monkey Beicheng, Lanshan District, Linyi City, Shandong Province, at the junction of Tianjin Road and Yimeng Road Patentee after: Elcoteq Shandong environmental monitoring Co. Ltd. Address before: 276000 Room 303, Building 3A, Famous Residence of Golden Monkey Beicheng, Lanshan District, Linyi City, Shandong Province, at the junction of Tianjin Road and Yimeng Road Patentee before: Pan Xiaochun |
|
| 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: 20170901 Termination date: 20210228 |