CN103067239A - Temperature transmitter communication system based on control bus and meter bus (C-MBUS) - Google Patents
Temperature transmitter communication system based on control bus and meter bus (C-MBUS) Download PDFInfo
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- CN103067239A CN103067239A CN2012105843404A CN201210584340A CN103067239A CN 103067239 A CN103067239 A CN 103067239A CN 2012105843404 A CN2012105843404 A CN 2012105843404A CN 201210584340 A CN201210584340 A CN 201210584340A CN 103067239 A CN103067239 A CN 103067239A
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Abstract
The invention discloses a temperature transmitter communication system based on a control bus and a meter bus (C-MBUS). The temperature transmitter communication system based on the C-MBUS comprises a bus communication circuit based on the C-MBUS, a temperature sensor, a collector and a processor, wherein the bus communication circuit is used for providing supply voltage, enabling an electrical signal instruction to be demodulated to be a digital signal instruction, enabling temperature value to be demodulated to be an electrical signal, and transmitting the electrical signal. According to the temperature transmitter communication system based on the C-MBUS, modulation, demodulation and transmission of the signal are achieved through a CMT001 chip of the C-MBUS communication system, the C-MBUS communication circuit provides the supply voltage for the communication system, and the one piece of the chip is used for not only providing the supply voltage, but also achieving data transmission. Due to the fact that a proprietary protocol chip and a proprietary switching circuit are not required, the size and power consumption are reduced.
Description
Technical field
The present invention relates to temperature transmitter communication transfer field, particularly relating to a kind of is the temperature transmitter communication system of C-MBUS based on bus communication system.
Background technology
At present in the industrial automation application, temperature transmitter mainly adopts PROFIBUS(Process field bus, Process FieldbusROFIBUS), CAN(Controller Area Network, controller local area network), HART(Highway Addressable Remote Transducer, the open communication agreement of highway addressable remote transducer), FF(Foundation Fieldbus, foundation fieldbus), EPA(Ethernet for Plant Automation is based on the factory automation of Ethernet) etc. communication modes carry out many nodes, remote data communication.
PROFIBUS is Process FieldbusROFIBUS, is German standard, and it introduces the concept of functional module, and different application need to be used different modules, comes definition module according to the PROFIBUS standard in a definite application, and its design cost is high, and technical difficulty is large.
CAN is that automobile monitoring and control design by company of German Bosch, and its target is the fieldbus that progressively develops into for other industrial circle controls, support the few of CAN in present industrial system, and power consumption is larger.
HART uses at present wider bus, but cost is high, and certain technical difficulty is arranged, and is a kind of communication modes between analog-and digital-.
FF is that the International Standards Organization of the just non-commercialization of internationally recognized unique not attached certain enterprise formulates, and it is take IEC/ISA SP-50 standard as source, but its cost is higher, application technology is complicated.
EPA is based on a domestic agreement of network (TCP/IP), is difficult to application but also be that, application technology higher owing to its cost is complicated.
At present, above-mentioned agreement all needs proprietary protocol chip and change-over circuit, and these all need to take certain volume and power consumption, so adopt above-mentioned agreement will increase power consumption and volume.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of temperature transmitter communication system based on C-MBUS, to realize reducing cost and the power consumption of temperature transmitter communication system.
For achieving the above object, the embodiment of the invention provides following scheme:
A kind of temperature transmitter system based on C-MBUS comprises: based on the bus communication circuit of C-MBUS; Temperature sensor; Collector; Processor;
Described bus communication circuit, be used to described temperature transmitter system that supply voltage is provided, and will receive the signal of telecommunication instruction that start-up temperature is measured, described signal of telecommunication instruction is demodulated into corresponding digital signal instruction and output, receive the Temperature numerical of the measured object of described processor transmission, described Temperature numerical is modulated to the signal of telecommunication and output;
Described processor receives the digital signal instruction of bus communication circuit output, and to collector, temperature sensor sends instruction, receives digitized signal and the numerical value that calculates object temperature and output that described collector is exported;
Described temperature sensor receives the instruction through the processor transmission of collector transmission, measures object temperature, generates corresponding temperature analog signal;
Described collector, the instruction that receiving processor sends gathers described temperature analog signal, with temperature analog signal digitlization and the output that obtains;
Wherein, described bus communication circuit comprises: protective resistance; The pin circuit that links to each other with protective resistance; The storage capacitor that links to each other with pin circuit; The CMT001 chip that links to each other with protective resistance, pin circuit, storage capacitor respectively; The pull-up resistor that links to each other with the CMT001 chip; The output capacitance that links to each other with the CMT001 chip;
Wherein, protective resistance is used for reducing electric current, protective circuit; Pin circuit provides required pin bias voltage to the CMT001 chip; Storage capacitor is used for storing the electric energy of CMT001 chip; The CMT001 chip is used for described signal of telecommunication instruction is demodulated into the digital signal instruction, and the Temperature numerical of the measured object that processor is measured is modulated to the signal of telecommunication; Pull-up resistor is used for serial communication, signal transmission; Output capacitance is used for out-put supply energy storage and filtering.
Preferably, described CMT001 chip comprises: receive data interface RXD sends data-interface TXD, power input interface VCC, interface of the ground wire GND, IN interface, idle interface NC, and two output voltage interfaces;
Power input interface VCC is used for access pin bias voltage;
The IN interface is used for receiver voltage;
Wherein, described pin circuit comprises: diode, the resistance that links to each other with described diode.
Wherein, described output capacitance comprises: tantalum electric capacity, the conventional ceramic electric capacity that links to each other with tantalum electric capacity.
Wherein, described collector comprises: the analog-to-digital conversion circuit that the temperature analog signal that generates is converted into the temperature digital signal.
Preferably, described system also comprises: the memory that stores offset data;
Described offset data is used for described digital temperature signal is carried out linearisation, to improve the accuracy of test object temperature.
Preferably, described terminal process equipment also comprises:
Display, debugging interface, and watchdog circuit;
Described display is used for showing the numerical value of described measurement object temperature;
Described debugging interface is used for the debugging local signal;
Described watchdog circuit is used for preventing that program from entering endless loop, the normal operation of monitoring program.
Based on technique scheme, a kind of temperature transmitter communication system based on C-MBUS that the embodiment of the invention provides passes through to use the C-MBUS bus communication system, modulation /demodulation and transmission by the CMT001 chip settling signal in the C-MBUS bus communication system, and the C-MBUS bus communication circuit provides supply voltage to communication system, use a slice chip that supply voltage both was provided, finished again data transfer.Because the C-MBUS protocol circuit is communicating circuit also is power circuit simultaneously, do not need proprietary protocol chip and change-over circuit, therefore the temperature transmitter of using the C-MBUS bus communication system can not increase volume and power consumption, and C-MBUS is a kind of cheaply bus communication system, so use the temperature transmitter cost of C-MBUS bus communication system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structure chart of a kind of temperature transmitter system based on C-MBUS that Fig. 1 provides for the embodiment of the invention;
The CMT001 chip structure figure that Fig. 2 provides for the embodiment of the invention;
The structure chart based on the C-MBUS bus communication circuit that Fig. 3 provides for the embodiment of the invention;
Another structure chart of a kind of temperature transmitter system based on C-MBUS that Fig. 4 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The structure chart of a kind of temperature transmitter system based on C-MBUS that is illustrated in figure 1 as that the embodiment of the invention provides comprises: based on the bus communication circuit of C-MBUS; Temperature sensor; Collector; Processor;
Described bus communication circuit, be used to described temperature transmitter system that supply voltage is provided, and will receive the signal of telecommunication instruction that start-up temperature is measured, described signal of telecommunication instruction is demodulated into corresponding digital signal instruction and output, receive the Temperature numerical of the measured object of described processor transmission, described Temperature numerical is modulated to the signal of telecommunication and output;
Described processor receives the digital signal instruction of bus communication circuit output, and to collector, temperature sensor sends instruction, receives digitized signal and the numerical value that calculates object temperature and output that described collector is exported;
Described temperature sensor receives the instruction through the processor transmission of collector transmission, measures object temperature, generates corresponding temperature analog signal;
Described collector, the instruction that receiving processor sends gathers described temperature analog signal, with temperature analog signal digitlization and the output that obtains;
Respectively to collector, processor provides voltage based on the bus communication circuit of C-MBUS.
Based on technique scheme, a kind of temperature transmitter system based on C-MBUS that the embodiment of the invention provides passes through to use the C-MBUS bus communication system, modulation /demodulation and transmission by CMT001 chip settling signal in the C-MBUS bus communication system, and the C-MBUS bus communication circuit provides supply voltage to communication system, use a slice chip that supply voltage both was provided, finished again data transfer, because the C-MBUS protocol circuit is communicating circuit also is power circuit simultaneously, do not need proprietary protocol chip and change-over circuit, therefore the temperature transmitter of using the C-MBUS bus communication system can not increase volume and power consumption, has reduced cost.
In addition, based on the communication system of the temperature transmitter of C-MBUS be a kind of cheaply, a bit to bus communication system of multiple spot, has communication apparatus capacity large (400 point), communication speed (4800bps), cost is low, simplicity of design, easy (nonpolarity arbitrarily branch connects up, general twisted-pair power cable), antijamming capability is strong, and bus can provide the characteristics up to the 500mA power supply.System has Auto Login feature, but the two-way interruptable advanced persons' such as the automatic login of this function finishing equipment, node interruption warning communication function.Bus isolation equipment has the bus failure isolation performance, other parts normal communication when guaranteeing the partial bus fault.
Be illustrated in figure 2 as the CMT001 chip structure figure that the embodiment of the invention provides, the CMT001 chip comprises: receive data interface RXD7 sends data-interface TXD4, two output voltage interfaces 5 and 6, IN interface 2, idle interface NC1, power input interface VCC8 and interface of the ground wire GND3;
In the Software for Design of communication, because temperature transmitter is slave station, temperature transmitter is the module that the temperature signal that will gather is converted to the discernible signal of telecommunication of main website, so the signal of telecommunication after will transforming based on the bus communication circuit of C-MBUS can output to the main website of the other end.
CMT001 chip interface RXD, TXD can directly connect main website or be connected with main website by optocoupler, and interface RXD receives the signal of telecommunication instruction that main website sends, and interface TXD sends the signal of telecommunication corresponding to testee temperature to main website;
An output voltage interface output 4.4V voltage, another interface output 5V voltage;
The voltage of a wide region of IN interface input is 15V～24V;
Power input interface VCC input pin bias voltage;
Because there is bus anti-collision circuit CMT001 inside, therefore when bus voltage is transmission state (24V), even the TXD pin has level to change, chip can not carry out Data Modulation to bus yet, therefore, when the user need to send data to bus, must guarantee that bus has been in receive data state (7V).
Be illustrated in figure 3 as the structure chart based on the C-MBUS bus communication circuit that the embodiment of the invention provides, bus communication circuit comprises: protective resistance R1; The pin circuit that links to each other with protective resistance, pin circuit comprises: 1N4148 diode V6 and resistance R 2; The storage capacitor E1 that links to each other with pin circuit; The CMT001 chip that links to each other with protective resistance, pin circuit, storage capacitor respectively; The pull-up resistor R3 that links to each other with the CMT001 chip; The output capacitance E2 and the C4 that link to each other with the CMT001 chip;
Wherein, protective resistance R1 is 2 ohm power resistor, for preventing that electric current is excessive the back circuit is caused damage, and protective circuit is set;
1N4148 diode V6 and resistance R 2 form pin circuit, provide required pin bias voltage to the CMT001 chip;
Storage capacitor E1 is the 470UF-35V electrochemical capacitor, is used for storing the electric energy of CMT001 chip;
The CMT001 chip is used for described signal of telecommunication instruction is demodulated into the digital signal instruction, and the Temperature numerical of the measured object that processor is measured is modulated to the signal of telecommunication;
Pull-up resistor R3 is 100K, is used for serial communication, signal transmission;
Output capacitance E2 and C4, E2 are tantalum electric capacity, and C4 is conventional ceramic electric capacity, and output capacitance is used for out-put supply energy storage and filtering.
In the Software for Design of communication, because this product is slave station, therefore the main response modes that adopts in concrete Protocol Design process, determines that by C-MBUS self communication speed is 4800bps about the C-MBUS bus, and protocol contents and form are fully by oneself definition; CMBUS supports all to meet any to the RS485 communications protocol of multiple spot, but support equipment does not return yard time above the long Frame Protocol of 300ms to main frame, utilize node to return the hardware characteristics that code can send simultaneously, but utilize the Auto Login feature of low level interrupt function finishing equipment and interrupt warning function.
Another structure chart of a kind of temperature transmitter system based on C-MBUS that is illustrated in figure 4 as that the embodiment of the invention provides comprises: temperature sensor 21, collector 22, processor 23, CMT001 chip 24, EMC module 25, memory 26, house dog electricity 27, display 28 and debugging interface 29;
Described temperature sensor 21, collector 22, processor 23, CMT001 chip 24 is identical with the function of the invention described above embodiment Fig. 1, is not repeated;
Wherein, collector is an analog-to-digital conversion circuit that the temperature analog signal that generates is converted into the temperature digital signal;
Described system also comprises: the memory 26 that is used for storing offset data;
Described offset data is used for described digital temperature signal is carried out linearisation, to improve the accuracy of test object temperature;
Described system also comprises:
Display 28, debugging interface 29, and watchdog circuit 27;
Described display is used for showing the numerical value of described measurement object temperature;
Described debugging interface is used for the debugging local signal;
Described watchdog circuit is used for preventing that program from entering endless loop, the normal operation of monitoring program.
Claims (8)
1. the temperature transmitter system based on C-MBUS is characterized in that, comprising: based on the bus communication circuit of C-MBUS; Temperature sensor; Collector; Processor;
Described bus communication circuit, be used to described temperature transmitter system that supply voltage is provided, and will receive the signal of telecommunication instruction that start-up temperature is measured, described signal of telecommunication instruction is demodulated into corresponding digital signal instruction and output, receive the Temperature numerical of the measured object of described processor transmission, described Temperature numerical is modulated to the signal of telecommunication and output;
Described processor receives the digital signal instruction of bus communication circuit output, and to collector, temperature sensor sends instruction, receives digitized signal and the numerical value that calculates object temperature and output that described collector is exported;
Described temperature sensor receives the instruction through the processor transmission of collector transmission, measures object temperature, generates corresponding temperature analog signal;
Described collector, the instruction that receiving processor sends gathers described temperature analog signal, with temperature analog signal digitlization and the output that obtains.
2. system according to claim 1 is characterized in that, described bus communication circuit comprises: protective resistance; The pin circuit that links to each other with protective resistance; The storage capacitor that links to each other with pin circuit; The CMT001 chip that links to each other with protective resistance, pin circuit, storage capacitor respectively; The pull-up resistor that links to each other with the CMT001 chip; The output capacitance that links to each other with the CMT001 chip;
Wherein, protective resistance is used for reducing electric current, protective circuit; Pin circuit provides required pin bias voltage to the CMT001 chip; Storage capacitor is used for storing the electric energy of CMT001 chip; The CMT001 chip is used for described signal of telecommunication instruction is demodulated into the digital signal instruction, and the Temperature numerical of the measured object that processor is measured is modulated to the signal of telecommunication; Pull-up resistor is used for serial communication, signal transmission; Output capacitance is used for out-put supply energy storage and filtering.
3. system according to claim 2 is characterized in that, described CMT001 chip comprises: receive data interface RXD sends data-interface TXD, power input interface VCC, interface of the ground wire GND, IN interface, idle interface NC, and two output voltage interfaces;
Power input interface VCC is used for access pin bias voltage;
The IN interface is used for receiver voltage.
4. system according to claim 2 is characterized in that, described pin circuit comprises: diode, the resistance that links to each other with described diode.
5. system according to claim 2 is characterized in that, described output capacitance comprises: tantalum electric capacity, the conventional ceramic electric capacity that links to each other with tantalum electric capacity.
6. system according to claim 1 is characterized in that, described collector comprises: the analog-to-digital conversion circuit that the temperature analog signal that generates is converted into the temperature digital signal.
7. system according to claim 1 is characterized in that, described system also comprises: the memory that stores offset data;
Described offset data is used for described digital temperature signal is carried out linearisation, to improve the accuracy of test object temperature.
8. system according to claim 1 is characterized in that, described system also comprises:
Display, debugging interface, and watchdog circuit;
Described display is used for showing the numerical value of described measurement object temperature;
Described debugging interface is used for the debugging local signal;
Described watchdog circuit is used for preventing that program from entering endless loop, the normal operation of monitoring program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105843404A CN103067239A (en) | 2012-12-30 | 2012-12-30 | Temperature transmitter communication system based on control bus and meter bus (C-MBUS) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105843404A CN103067239A (en) | 2012-12-30 | 2012-12-30 | Temperature transmitter communication system based on control bus and meter bus (C-MBUS) |
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| Publication Number | Publication Date |
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| CN103067239A true CN103067239A (en) | 2013-04-24 |
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| CN2012105843404A Pending CN103067239A (en) | 2012-12-30 | 2012-12-30 | Temperature transmitter communication system based on control bus and meter bus (C-MBUS) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540222A (en) * | 2019-01-03 | 2019-03-29 | 浙江求是人工环境有限公司 | A kind of temperature and humidity sensing device based on unified communication interface |
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| JP2001283370A (en) * | 2000-03-30 | 2001-10-12 | Osaka Gas Co Ltd | Power-line carrier communication device for automatic meter reading |
| CN201429474Y (en) * | 2009-07-15 | 2010-03-24 | 安徽皖科电子工程有限公司 | Temperature transmitter based on PROFIBUS-PA bus communication protocol |
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Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109540222A (en) * | 2019-01-03 | 2019-03-29 | 浙江求是人工环境有限公司 | A kind of temperature and humidity sensing device based on unified communication interface |
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Application publication date: 20130424 |