CN210719453U - Thermal resistance temperature measuring device based on RS485 bus - Google Patents
Thermal resistance temperature measuring device based on RS485 bus Download PDFInfo
- Publication number
- CN210719453U CN210719453U CN201921483888.3U CN201921483888U CN210719453U CN 210719453 U CN210719453 U CN 210719453U CN 201921483888 U CN201921483888 U CN 201921483888U CN 210719453 U CN210719453 U CN 210719453U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- amplifier
- main control
- control unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a thermal resistance temperature measuring device based on RS485 bus, which comprises an acquisition amplifying circuit, a temperature measuring circuit and a temperature measuring circuit, wherein the acquisition amplifying circuit is used for converting thermal resistance signals into analog voltage signals of 0-2V; the main control unit is used for transmitting and communicating data; the RS485 interface circuit is used for realizing the communication between the PC and the field bus module; the power supply circuit is used for providing a working power supply for the acquisition amplifying circuit, the main control unit and the RS485 interface circuit; the acquisition amplifying circuit and the RS485 interface circuit are connected with the main control unit, and the power circuit is connected with the acquisition amplifying circuit, the RS485 interface circuit and the main control unit. The utility model discloses can carry out real-time collection to the temperature, adopt the RS485 photoelectric isolation interface that supports MODBUS industrial field bus agreement to communicate with the PC.
Description
Technical Field
The utility model relates to a thermal resistance temperature measurement technical field, more specifically say, in particular to thermal resistance temperature measuring device based on RS485 bus.
Background
Temperature acquisition becomes an important parameter in industrial object control, most of the current temperature collectors adopt a single acquisition mode, and do not generally support an RS485 interface of an MODBUS industrial field bus protocol to communicate with the outside. Therefore, it is necessary to develop a thermal resistance temperature measuring device based on an RS485 bus.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thermal resistance temperature measuring device based on RS485 bus to overcome the defect that prior art exists.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a thermal resistance temperature measuring device based on an RS485 bus comprises an acquisition amplifying circuit, a temperature measuring circuit and a temperature measuring circuit, wherein the acquisition amplifying circuit is used for converting a thermal resistance signal into a 0-2V analog voltage signal; the main control unit is used for transmitting and communicating data; the RS485 interface circuit is used for realizing the communication between the PC and the field bus module; the power supply circuit is used for providing a working power supply for the acquisition amplifying circuit, the main control unit and the RS485 interface circuit; the acquisition amplifying circuit and the RS485 interface circuit are connected with the main control unit, and the power circuit is connected with the acquisition amplifying circuit, the RS485 interface circuit and the main control unit.
Further, the acquisition amplification circuit comprises a first amplifier U1A, a second amplifier U2B and a thermistor PT100, the anode of the input end of the first amplifier U1A is connected with a resistor R10 and a resistor R6, the other end of the resistor R10 is grounded through a capacitor C39, the cathode of the input end of the first amplifier U1A is connected with a resistor R14, a resistor R21 and a capacitor C28, the other end of the resistor RD14 is grounded, the other end of the resistor R21 is connected with the output end of the first amplifier U1A through a resistor R22, the other end of the capacitor C28 is connected with the output end of the first amplifier U1 28, the output end of the first amplifier U1 28 is connected with the other end of the resistor R28 through a resistor R28, the other end of the resistor R28 is further connected with a resistor R28 and a thermistor PT100, the other end of the thermistor PT100 is grounded and connected with a resistor R28, the other end of the resistor R28 is connected with the cathode of the input end of the second amplifier U1 4672 and the resistor R28, The rear end of the resistor R17 is connected with the output end of the second amplifier U2B, the other end of the resistor R12 is connected with the anode of the input end of the second amplifier U2B, the capacitor C21 and the resistor R7 after passing through the resistor R13, the other end of the capacitor C21 and the other end of the resistor R7 are grounded, and the output end of the second amplifier U2B is grounded through the capacitor C25 and the resistor R24.
Further, the main control unit adopts a singlechip with the model number of C8051F 410.
Compared with the prior art, the utility model has the advantages of: the utility model discloses can carry out real-time collection to the temperature, adopt the RS485 photoelectric isolation interface that supports MODBUS industrial field bus agreement to communicate with the PC.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the thermal resistance temperature measuring device based on the RS485 bus of the present invention.
Fig. 2 is a circuit diagram of the middle collecting and amplifying circuit of the present invention.
Fig. 3 is a circuit diagram of the main control unit of the present invention.
Fig. 4 is a circuit diagram of the RS485 interface circuit of the present invention.
Fig. 5 is a circuit diagram of the power supply circuit of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
Referring to fig. 1, the utility model provides a thermal resistance temperature measuring device based on RS485 bus, which comprises an acquisition amplifying circuit, a temperature measuring circuit and a temperature measuring circuit, wherein the acquisition amplifying circuit is used for converting thermal resistance signals into 0-2V analog voltage signals; the main control unit is used for transmitting and communicating data; the RS485 interface circuit is used for realizing the communication between the PC and the field bus module; the power supply circuit is used for providing a working power supply for the acquisition amplifying circuit, the main control unit and the RS485 interface circuit; the acquisition amplifying circuit and the RS485 interface circuit are connected with the main control unit, and the power circuit is connected with the acquisition amplifying circuit, the RS485 interface circuit and the main control unit.
Referring to fig. 2, the acquisition amplifying circuit adopts a three-wire wiring method to eliminate the measurement error introduced by the lead. Because the C8051F410 singlechip is provided with an A/D conversion interface, an A/D conversion circuit does not need to be designed separately. The acquisition amplifying circuit comprises a first amplifier U1A, a second amplifier U2B and a thermistor PT100, wherein the anode of the input end of the first amplifier U1A is connected with a resistor R10 and a resistor R6, the other end of the resistor R10 is grounded through a capacitor C39, the cathode of the input end of the first amplifier U1A is connected with a resistor R14, a resistor R21 and a capacitor C21, the other end of the resistor RD 21 is grounded, the other end of the resistor R21 is connected with the output end of the first amplifier U1 21 through a resistor R21, the other end of the capacitor C21 is connected with the output end of the first amplifier U1 21, the output end of the first amplifier U1 21 is connected with the other end of the resistor R21 through the resistor R21, the other end of the resistor R21 is also connected with the resistor R21 and the thermistor PT100, the other end of the thermistor PT100 is grounded and connected with the resistor R21, the other end of the resistor R21 is connected with the input end of the second amplifier U2 21 and the output end of the resistor R21 sequentially connected with the second amplifier U21 through the resistor R36, the other end of the resistor R12 is connected with the anode of the input end of the second amplifier U2B, the capacitor C21 and the resistor R7 through a resistor R13, the other end of the capacitor C21 and the other end of the resistor R7 are all grounded, and the output end of the second amplifier U2B is also grounded through the capacitor C25 and the resistor R24. The thermistor PT100 changes the resistance value according to the temperature signal, the change of the measured temperature is directly measured through the change of the resistance value of the thermal resistor, a constant current is added to an acquisition circuit formed by the thermistor PT100 to generate an analog voltage signal, the analog voltage signal is converted into a digital signal which can be identified by a singlechip through A/D (analog/digital) conversion, and the digital signal is input into the singlechip for processing.
Referring to fig. 3, the main control unit is a single chip microcomputer with a model number of C8051F 410. In the pins of the C8051F410 singlechip, VDD is a core power supply, VIO is an I/O power supply, and GND is ground. VRTC-BACKUP is a smart Clock BACKUP power supply, P1.0-P1.5 are receiving ends of 6 paths of analog signals, R (P0.5) and T (P0.4) are receiving and transmitting ends of digital serial ports, and C2D and C2CK are JTAG download debugging interfaces. VCC is a 5.0V power interface. GND is the ground interface. XTAL3 port is smart Clock oscillator crystal input, XTAL4 port is smart Clock oscillator crystal output.
Referring to fig. 4, the RS485 interface circuit can realize communication between the PC and the fieldbus module.
Referring to fig. 5, the power circuit outputs +5V and-5V voltages from 220VAC through the switching power regulator circuit to provide operating power to various circuits in the module.
Through the utility model discloses a design, this temperature acquisition device can carry out real-time collection to the temperature, adopts the RS485 optoelectronic isolation interface that supports MODBUS industrial field bus agreement to communicate with the PC simultaneously.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.
Claims (3)
1. The utility model provides a thermal resistance temperature measuring device based on RS485 bus which characterized in that: the circuit comprises an acquisition amplifying circuit, a control circuit and a control circuit, wherein the acquisition amplifying circuit is used for converting a thermal resistance signal into a 0-2V analog voltage signal; the main control unit is used for transmitting and communicating data; the RS485 interface circuit is used for realizing the communication between the PC and the field bus module; the power supply circuit is used for providing a working power supply for the acquisition amplifying circuit, the main control unit and the RS485 interface circuit; the acquisition amplifying circuit and the RS485 interface circuit are connected with the main control unit, and the power circuit is connected with the acquisition amplifying circuit, the RS485 interface circuit and the main control unit.
2. The thermal resistance temperature measuring device based on the RS485 bus as claimed in claim 1, wherein: the acquisition amplification circuit comprises a first amplifier U1A, a second amplifier U2B and a thermistor PT100, wherein the anode of the input end of the first amplifier U1A is connected with a resistor R10 and a resistor R6, the other end of the resistor R10 is grounded through a capacitor C39, the cathode of the input end of the first amplifier U1A is connected with a resistor R14, a resistor R21 and a capacitor C21, the other end of the resistor RD 21 is grounded, the other end of the resistor R21 is connected with the output end of the first amplifier U1 21 through a resistor R21, the other end of the capacitor C21 is connected with the output end of the first amplifier U1 21, the output end of the first amplifier U1 21 is connected with the other end of the resistor R21 through a resistor R21, the other end of the resistor R21 is also connected with the resistor R21 and the thermistor PT100, the other end of the thermistor PT100 is grounded and connected with the resistor R21, the other end of the resistor R21 is connected with the input end of the second amplifier U2 21 and the output end of the resistor R21 sequentially through the resistor R21 and the second amplifier U36, the other end of the resistor R12 is connected with the anode of the input end of the second amplifier U2B, the capacitor C21 and the resistor R7 through a resistor R13, the other end of the capacitor C21 and the other end of the resistor R7 are all grounded, and the output end of the second amplifier U2B is also grounded through the capacitor C25 and the resistor R24.
3. The thermal resistance temperature measuring device based on the RS485 bus as claimed in claim 1, wherein: the main control unit adopts a singlechip with the model number of C8051F 410.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921483888.3U CN210719453U (en) | 2019-09-08 | 2019-09-08 | Thermal resistance temperature measuring device based on RS485 bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921483888.3U CN210719453U (en) | 2019-09-08 | 2019-09-08 | Thermal resistance temperature measuring device based on RS485 bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210719453U true CN210719453U (en) | 2020-06-09 |
Family
ID=70934423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921483888.3U Expired - Fee Related CN210719453U (en) | 2019-09-08 | 2019-09-08 | Thermal resistance temperature measuring device based on RS485 bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210719453U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985759A (en) * | 2021-09-29 | 2022-01-28 | 山东爱通工业机器人科技有限公司 | Data acquisition and conversion module for robot polishing workstation |
-
2019
- 2019-09-08 CN CN201921483888.3U patent/CN210719453U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985759A (en) * | 2021-09-29 | 2022-01-28 | 山东爱通工业机器人科技有限公司 | Data acquisition and conversion module for robot polishing workstation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101343104B (en) | Intelligent transmission apparatus for pH value of water | |
| CN203241165U (en) | Thermal resistor temperature measurement circuit based on three-wire system | |
| CN203177993U (en) | Temperature measuring circuit | |
| CN210719453U (en) | Thermal resistance temperature measuring device based on RS485 bus | |
| CN209961315U (en) | Dynamic and static railroad track scale weighing instrument | |
| CN203573477U (en) | Effective wireless monitoring data receiving/transmitting device for grain drying equipment | |
| CN114624517B (en) | Universal resistor, voltage and frequency signal acquisition module | |
| CN207976224U (en) | A kind of temperature transmitter | |
| CN204988567U (en) | Monocrystalline silicon formula pressure transmitter | |
| CN201247271Y (en) | Electronic single-phase power electric energy meter | |
| CN211554775U (en) | High-precision converter for converting current into voltage | |
| CN105277292A (en) | Temperature measurement device | |
| CN203587243U (en) | Temperature acquiring and processing circuit for electric-bag composite dust collector | |
| CN201255731Y (en) | Road tunnel carbon monoxide concentration detection device having network interface | |
| CN111735553A (en) | PT100 temperature collector with Modbus485 communication | |
| CN204206279U (en) | A kind of standby power consumption of mobile phone test circuit | |
| CN205102964U (en) | Portable soft organizational interface force measuring system of multichannel | |
| CN207036332U (en) | A kind of signal processing system of high pressure flow auto-controlling apparatus | |
| CN204988565U (en) | Capacitanc pressure transmitter | |
| CN103616086A (en) | Thermal resistance temperature transmitter | |
| CN205958139U (en) | Temperature transmitter that accuracy is high | |
| CN212458700U (en) | PT100 temperature collector with Modbus485 communication | |
| CN216207098U (en) | Novel digital temperature sensor with variable resolution | |
| CN217953554U (en) | High-precision industrial temperature and humidity transmitter | |
| CN113810789B (en) | Multi-parameter distributed intelligent sensing node for working condition of power equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200609 Termination date: 20210908 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |