CN103092801A - Bus power supply communication method - Google Patents
Bus power supply communication method Download PDFInfo
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- CN103092801A CN103092801A CN2013100334968A CN201310033496A CN103092801A CN 103092801 A CN103092801 A CN 103092801A CN 2013100334968 A CN2013100334968 A CN 2013100334968A CN 201310033496 A CN201310033496 A CN 201310033496A CN 103092801 A CN103092801 A CN 103092801A
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Abstract
The invention relates to a power supply communication scheme which is large in power, high in speed, simple and convenient to use, and provides a bus power supply communication method. The method comprises the step that power is supplied for a system through a host machine at a power supply voltage (VH), and further comprises the steps that firstly, the host machine modulates a pulse signal to send data to a secondary device, the time for sending a bit of data is T; secondly, the secondary device passes back the data to the host machine through a bus, the time for the secondary device to pass back a bit of data is T2, the T2 is smaller than the T; thirdly, the host machine receives the passed-back data from the secondary device at communication voltage (VM); and fourthly, after finishing receiving the passed-back data, the host machine turns the communication voltage (VM) to be the power supply voltage (VH) and supplies the power to the system.
Description
Technical field
The present invention relates to a kind of bus-powered means of communication, relate in particular to a kind of slave to the power supply communication method of main frame passback data.
Background technology
In remote large-scale complex network situation, need to arrange very complicated communication network, its wire laying mode of taking mostly is the bus mode wiring, as 485, the control buss such as CAN, but the communication cable that the bus requirements of this class routine separates and power devices cable be wiring separately, and cable has polarity, so, line layout is installed very complicated, the thing of misconnection circuit often has generation, serious situation meeting damage on-site parts, the difficulty of increasing construction maintenance.Particularly present floor area of building is large, and the complicacy of building is high, and the complexity of the communication network that makes is also high, and is also more and more higher to the requirement of cable quality, so greatly increased the cost of whole system cable.The market active demand is a kind of simple and convenient, to the lower solution of cable quality dependency degree.
The RS485 system of prior art adopts serial port protocol, adopts the mode of differential level on circuit, and often power supply capacity is more weak.As shown in Figure 1, be the sequential chart of main frame in prior art to the slave power supply communication.Main frame is from power devices when high level VH, when showing as high level VH, the communication of main frame sends binary data " 1 ", send binary data " 0 " during low level VM, when " 0 " that main frame need to send when data are more, system is owing to being in for a long time low level, just very low to the power supply capacity from equipment, can't satisfy some power consumption is required larger equipment.
Summary of the invention
In order to address the above problem, for the user provides a kind of high-power, two-forty and power supply communication scheme simply and easily, the present invention proposes a kind of bus-powered means of communication, comprises by main frame also comprising take supply voltage (VH) as system power supply:.
Step 01, main frame modulated pulse signal are to from equipment sending data, and the time that sends a Bit data is T.
Step 02 returns data by bus to main frame from equipment, and the time that returns a Bit data from equipment is T2, and T2 is less than T.
Step 03, main frame is with the passback data of communication voltage (VM) reception from equipment.
After step 04, main frame received the passback data, upset communication voltage (VM) was supply voltage (VH), is system power supply.
Further, in step 01 li, main frame sends to bus with communication voltage (VM) and detects data, and whether detect slave has the data passback, described detection sequential overall length is T4, if the data passback is arranged, enters step 03, if nothing, upset communication voltage (VM) is supply voltage (VH), until T4 finishes.
Further, in step 01 li, the time that main frame sends bit-binary data " 1 " is T1; The time that main frame sends bit-binary data " 0 " is T0, and in the time, main frame is T2 in time span of the upper modulation of supply voltage (VH) at T0, and voltage is the pulse signal of communication voltage (VM).
Especially, described bus compatible RS485 bus protocol, VH 〉=12V, 0V＜=VM＜=10V, T4 〉=10T, T1=T0, T2＜=40 μ s.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the instructions of writing, claims and accompanying drawing.
Introduce preferred embodiment below in conjunction with accompanying drawing, the technical scheme that the present invention is proposed is described in detail.Should be noted that, the purpose of accompanying drawing just is convenient to the explanation to the specific embodiment of the invention, is not a kind of unnecessary narration or limitation of the scope of the invention.
Description of drawings
Fig. 1 be in prior art main frame to the sequential chart of slave power supply communication.
Fig. 2 is bus-powered communication system.
Fig. 3 is the sequential chart that main frame sends data.
Fig. 4 is the embodiment that main frame sends data.
Fig. 5 is that main frame sends the sequential chart that detects data and slave passback data.
Embodiment
Power supply communication method of the present invention realizes by bus system shown in Figure 2, provide supply voltage (VH) and to from equipment sending data by main frame, return data by bus to main frame from equipment, data when passback arranged when main frame detecting from equipment, read the passback data on bus.Concrete workflow is following 4 steps.
Step 01, main frame modulated pulse signal are to from equipment sending data, and the time that sends 1 Bit data is T.
Step 02, with communication voltage (VM) passback data, the time of passback 1 Bit data is T3 from equipment, and T3 is less than T, and communication voltage (VM) is less than supply voltage (VH).
Step 03, main frame receives the passback data from equipment.
After step 04, main frame received the passback data, upset communication voltage (VM) was supply voltage (VH), is system power supply.
Usually, VH 〉=12V, 0V＜=VM＜=10V.
Because the speed 1/T3 from equipment passback data sends the speed 1/T of data higher than main frame, i.e. asymmetrical transfer rate like this can compatible serial port protocol, and guarantees the requirement of power supply and communication.
Be illustrated in figure 3 as in step 01, main frame sends the sequential chart of data.The time T that main frame sends 1 Bit data comprises: main frame sends binary data " 1 " with supply voltage (VH), and the time that sends a Bit data " 1 " is T1; The time that main frame sends bit-binary data " 0 " is T0, and in the time, main frame is T2 in time span of the upper modulation of supply voltage (VH) at T0, and voltage is the pulse signal of VM.The time T 1 that sends a Bit data " 0 " equated with the time that sends a Bit data " 1 ".
For example, it is " 00101 " that main frame sends a string data, the sequential chart of main frame as shown in Figure 4, when sending " 0 " data, supply voltage was in the VM higher than zero level before this, then draw high supply voltage VH, so just can guarantee to have higher communication efficiency and enough system power supply abilities at main frame.
System applies is on the RS485 bus time, and T1=T0=200us has better power supplying efficiency in order to make this system on the RS485 bus, experiment showed, that power supply capacity is higher when T2＜40us.
In step 01 li, main frame sends to bus with communication voltage (VM) and detects data, detect slave whether the data passback is arranged, described detection sequential overall length is T4, if the data passback is arranged, enters step 03, if nothing, upset communication voltage (VM) is supply voltage (VH), until the T4 end, as shown in Figure 5.
This mode that the passback data are monitored has changed VM and has accepted the time of data and the time of VH power supply, can guarantee in the situation that main frame does not have receive data that maximum power supplying efficiency is provided.
System applies is on the RS485 bus time, and T4 〉=10T is to guarantee higher power supply capacity.
The above is only the preferred embodiment of the present invention; but they are not the limitations of the scope of the invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, within some improvements and modifications of having done also should be considered as protection scope of the present invention.
Claims (8)
1. bus-powered means of communication comprise by main frame also comprising take supply voltage (VH) as system power supply:
Step 01, main frame modulated pulse signal are to from equipment sending data, and the time that sends a Bit data is T;
Step 02 returns data by bus to main frame from equipment, and the time that returns a Bit data from equipment is T2, and T2 is less than T;
Step 03, main frame is with the passback data of communication voltage (VM) reception from equipment;
After step 04, main frame received the passback data, upset communication voltage (VM) was supply voltage (VH), is system power supply.
2. the bus-powered means of communication according to claim 1, it is characterized in that, in step 01 li, main frame sends to bus with communication voltage (VM) and detects data, and whether detect slave has the data passback, described detection sequential overall length is T4, if the data passback is arranged, enters step 03, if nothing, upset communication voltage (VM) is supply voltage (VH), until T4 finishes.
3. the bus-powered means of communication according to claim 1, is characterized in that, in step 01 li, the time that main frame sends bit-binary data " 1 " is T1; The time that main frame sends bit-binary data " 0 " is T0, and in the time, main frame is T2 in time span of the upper modulation of supply voltage (VH) at T0, and voltage is the pulse signal of communication voltage (VM).
4. the according to claim 1 and 2 or 3 described bus-powered means of communication, is characterized in that, described bus compatible RS485 bus protocol.
5. the according to claim 1 and 2 or 3 described bus-powered means of communication, is characterized in that, VH 〉=12V, 0V＜=VM＜=10V.
6. the bus-powered means of communication according to claim 4, is characterized in that T4 〉=10T.
7. the bus-powered means of communication according to claim 3, is characterized in that T1=T0.
8. the bus-powered means of communication according to claim 4, is characterized in that, T2＜=40 μ s.
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| CN2013100334968A CN103092801A (en) | 2013-01-29 | 2013-01-29 | Bus power supply communication method |
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| CN2013100334968A CN103092801A (en) | 2013-01-29 | 2013-01-29 | Bus power supply communication method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016107378A1 (en) * | 2014-12-30 | 2016-07-07 | 王玮冰 | Power supply device and control method therefor |
| CN106130857A (en) * | 2016-08-26 | 2016-11-16 | 深圳市嘉泰智能股份有限公司 | Two-wire power supply and communication system and method |
| CN106201972A (en) * | 2016-07-01 | 2016-12-07 | 西安交大能源电子技术开发公司 | A kind of high speed serial communication method being applicable to low cost child node |
| CN109714236A (en) * | 2019-02-26 | 2019-05-03 | 北京强联通讯技术有限公司 | The bus-powered and means of communication, device and storage medium |
| CN109889419A (en) * | 2019-02-26 | 2019-06-14 | 北京强联通讯技术有限公司 | The bus-powered and means of communication, device and storage medium |
| CN112542037A (en) * | 2020-12-23 | 2021-03-23 | 深圳市骏普科技开发有限公司 | Digital meter reading communication system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016107378A1 (en) * | 2014-12-30 | 2016-07-07 | 王玮冰 | Power supply device and control method therefor |
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| CN106201972A (en) * | 2016-07-01 | 2016-12-07 | 西安交大能源电子技术开发公司 | A kind of high speed serial communication method being applicable to low cost child node |
| CN106201972B (en) * | 2016-07-01 | 2019-02-26 | 西安交大能源电子技术开发公司 | A kind of high speed serial communication method suitable for inexpensive child node |
| CN106130857A (en) * | 2016-08-26 | 2016-11-16 | 深圳市嘉泰智能股份有限公司 | Two-wire power supply and communication system and method |
| CN109714236A (en) * | 2019-02-26 | 2019-05-03 | 北京强联通讯技术有限公司 | The bus-powered and means of communication, device and storage medium |
| CN109889419A (en) * | 2019-02-26 | 2019-06-14 | 北京强联通讯技术有限公司 | The bus-powered and means of communication, device and storage medium |
| CN109889419B (en) * | 2019-02-26 | 2021-06-15 | 北京强联通讯技术有限公司 | Bus power supply and communication method, device and storage medium |
| CN109714236B (en) * | 2019-02-26 | 2021-12-14 | 北京强联通讯技术有限公司 | Bus power supply and communication method, device and storage medium |
| CN112542037A (en) * | 2020-12-23 | 2021-03-23 | 深圳市骏普科技开发有限公司 | Digital meter reading communication system |
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Application publication date: 20130508 |