CN1819522B - M-Bus host interface device - Google Patents
M-Bus host interface device Download PDFInfo
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- CN1819522B CN1819522B CN 200610043225 CN200610043225A CN1819522B CN 1819522 B CN1819522 B CN 1819522B CN 200610043225 CN200610043225 CN 200610043225 CN 200610043225 A CN200610043225 A CN 200610043225A CN 1819522 B CN1819522 B CN 1819522B
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Abstract
The invention consists of a transmission circuit and a receiving circuit used in M-Bus host machine. The said transmission circuit comprises an N-channel MOS tube and a P-channel MOS tube connected to said N-channel MOS tube. The said receiving circuit comprises an operational amplifier and an optical coupler connected to the said operational amplifier. The invention can use normal twisted pair, and its bus can supply power.
Description
Technical field
The present invention relates to a kind of interface arrangement, is a kind of M-Bus bus host interface arrangement specifically.
Background technology
M-Bus is the Dr.Horst Ziegler of Paderbom university and the Deutschland GmbH and the common proposition of TechemGmbH of TI company, is specifically designed to the bus structures of government utility instrument, claims Merer-Bus, is called for short M-Bus.The M-Bus meter bus belongs to local area network (LAN), is to be in same building, same university or to have an area of several kilometers far away dedicated networks in the region, is used to connect remote monitoring computer and equipment such as work station, measuring instrument, so that resource-sharing and transfer of data.The M-Bus meter bus has 3 essential characteristics of LAN: (1) scope, (2) transmission technology, (3) topological structure.LAN has star, annular and bus topology structure.The M-Bus meter bus can satisfy the specific (special) requirements of the measuring instrument of battery-powered or remote power feeding.Generally speaking the number that is connected on the measuring instrument on the meter bus can reach hundreds of, and the distance of transfer of data can reach thousands of rice.The M-Bus meter bus is a kind of family cheaply electronic system, can realize the networking and the remote meter-reading function of government utility instrument.The government utility instrument comprises measuring instruments such as electric supply meter, water meter, calorimeter.It is big that M-Bus has a communication apparatus capacity, the communication speed height, and cost is low, simplicity of design, it is easy to connect up, and antijamming capability is strong, and can adopt bus-powered mode.This communication system can be widely used in central three meter transcribing, wired home Control Network, fire protection warning and interlock network, the intelligent Control Network in sub-district, central air conditioning system etc.
The M-Bus meter bus has a extensive future, but on the present market, only has the slave interface chip to come out, and do not have host chip to use, and for this reason, we develop this M-Bus bus host interface arrangement, and are applied in a plurality of electronic systems, and are respond well.But utilize the present invention's design specialized M-Bus host interface chip, apply of the present invention having a extensive future.
Summary of the invention
Purpose of the present invention just provides and a kind ofly can satisfy the electronic application needs, and M-Bus bus host interface arrangement easy to use, can remote power feeding.
Of the present invention by following technical measures realization goal of the invention:
A kind of M-Bus bus host interface arrangement, comprise M-Bus bus host transtation mission circuit and receiving circuit, it is characterized in that, described transtation mission circuit comprises N-channel MOS pipe (15) and is attached thereto the P channel MOS tube (33) that connects, receiving circuit comprises operational amplifier (35) and is attached thereto the optocoupler (39) that connects, described operational amplifier first via amplifier and triode (36), to detect voltage amplification, constitute the voltage-tracing device by four tunnel general-purpose operation amplifiers (35) the second tunnel amplifiers, be used to stablize the voltage signal of four tunnel general-purpose operation amplifier (35) first via output, form substracting unit by four tunnel general-purpose operation amplifier (35) Third Road amplifiers and peripheral circuit, form voltage comparator by four tunnel general-purpose operation amplifiers (35) the four tunnel amplifier and peripheral circuit thereof.
As the further qualification to the technical program, described N-channel MOS pipe (15) uses 2N700, and described P channel MOS tube (33) uses 9530.
As the further qualification to the technical program, described operational amplifier (35) adopts LM348.
As the further qualification to the technical program, described optocoupler (39) adopts 6N139.
Compared with prior art, advantage of the present utility model and good effect are: it is big that the M-Bus communication apparatus has a capacity, the communication speed height, and cost is low, simplicity of design, wiring is simple, nonpolarity branch arbitrarily, can use general twisted-pair power cable, antijamming capability is strong, and bus can provide the characteristics of power supply.
Description of drawings
Fig. 1 is the electrical block diagram of the preferred embodiment of the present invention.
Fig. 2 receives the internal circuit that sends chip TSS721 with the matching used M-Bus bus slave computer of the present invention.
Embodiment
M-Bus communication protocol regulation: M-Bus bus host transtation mission circuit by control bus voltage (when sending logical one, output HIGH voltage; When sending logical zero, output LOW voltage.) change to slave transmission information, the slave receiving circuit of supporting application need have the ability of testbus change in voltage with it.Send difference that chip TSS721A requires the high low-voltage of bus greater than 6V because of receiving with the matching used M-bus bus slave computer of the present invention, therefore, the high voltage of this device output is selected 24V, and the low-voltage of output is selected 16V, and pressure difference is 8V.
By shown in Figure 1, when the M-Bus bus host sent logical one, the TXD end shown in Fig. 1 was high level, one 15 conductings of N-channel MOS pipe, thus make 33 conductings of P channel MOS tube, and then to make the output voltage of P channel MOS tube 33 be 24V.When the M-Bus bus host sent logical zero, 8V voltage stabilizing didoe 12 decisions shown in Fig. 1 were because the negative pole place voltage of voltage stabilizing didoe is 24V, so the voltage of output this moment is 16V.Since during high-low level changes, the capacity effect that long cable produces, and therefore becoming low level in output by high level has the regular hour to postpone, and in order to produce steeper trailing edge, the voltage on the cable is bled off as early as possible when low level arrives.So in M-Bus bus host transtation mission circuit, increased metal-oxide-semiconductor 14 and two 8V voltage stabilizing didoes 37 and 38 and diode 28.When the TXD end is for low level among Fig. 1 when the M-Bus bus host sends logical zero, metal-oxide-semiconductor 15 ends, but moment metal-oxide-semiconductor 14 just conductings, voltage on the cable just can bleed off voltage by metal-oxide-semiconductor 14, because the drain electrode of metal-oxide-semiconductor 14 has connected two 8V voltage stabilizing didoes, so the voltage on the cable can only be reduced to 16V, promptly this installs desired low level.When the M-bus bus host sends data,,, therefore in device, all selected voltage-controlled metal-oxide-semiconductor for use to reduce line drop in order to make the electric current on the bus as far as possible little.Owing to have current detection circuit to be used to receive the data (slave changes to main frame transmission information by the control bus electric current) that the M-bus bus slave computer sends in the M-bus bus interface devices, therefore require the current constant on the bus when the M-bus bus host sends data.So with the M-bus bus slave computer receiving chip of the supporting application of the present invention should adopt TI company TSS721A or with the chip that identical electrical characteristic is arranged, to guarantee M-Bus main frame transtation mission circuit when sending data, the current constant on the bus.
M-bus communication protocol regulation: (when sending logical one, it is constant to keep bus current by the control bus electric current for the M-bus bus slave computer; When sending logical zero, make bus current increase a fixed amount) change to main frame transmission information.Therefore the M-bus bus host receiving circuit among the present invention has the ability that the testbus electric current changes, and can detect the variation of 5mA electric current.The current sense function of M-bus bus host receiving circuit is realized by four tunnel general-purpose operation amplifiers 35 and peripheral circuit among Fig. 1.In order to convert the electric current new signal to voltage signal, the bus interface receiving end is connected in series a resistance 24.In M-bus bus host receiving circuit, adopt four tunnel general-purpose operation amplifiers, 35 first via amplifier and triodes, will detect voltage amplification.By the short characteristic of the void of amplifier as can be known the voltage at resistance 22 and resistance 24 two ends equate.Because triode 36 conductings, again by the empty disconnected characteristic of amplifier, the electric current that flows through the electric current of resistance 17 as can be known and flow through on the resistance 22 equates that therefore the voltage (the forward input voltages of four tunnel general-purpose operation amplifiers, 35 the second tunnel amplifiers) that can calculate on the resistance 17 is U=(resistance 24* bus current/resistance 22) * resistance 17.In this device, selecting resistance 24 for use is 10 Ω, and resistance 22 resistances are 400 Ω, and resistance 17 resistances are 10k Ω.Bus current is 5mA when requiring the M-bus bus slave computer to send logical zero in the present invention according to the needs of practical application, and bus current is 1.3mA when sending logical one.So when the M-bus bus slave computer sends logical one, the detected voltage U of M-bus bus host=0.325, when the M-bus bus slave computer sends logical zero, the detected voltage U of M-bus bus host=1.25.Constitute the voltage-tracing device by four tunnel general-purpose operation amplifiers, 35 the second tunnel amplifiers, be used to stablize the voltage signal of four tunnel general-purpose operation amplifiers, 35 first via output.The logical zero of the data that the M-bus slave sends behind the preceding two-way operational amplifier of process is corresponding to 1.25V voltage, logical one is corresponding to 0.325V voltage, some array apparatus change into the standard Transistor-Transistor Logic level with this signal so that single-chip microcomputer receives for the ease of designing, and form substracting unit by four tunnel general-purpose operation amplifiers, 35 Third Road amplifiers and peripheral circuit.Through behind this substracting unit, the logical zero of the data that the M-bus slave sends is corresponding to voltage U=22.75V, and logical one is corresponding to U=23.675V.Will be far longer than 5V through the result who obtains behind the subtraction circuit, single-chip microcomputer can't receive, will be when the Transistor-Transistor Logic level that we need convert it to single-chip microcomputer needs is subtracter output 23.675V corresponding to high level+5V, export 22.75 o'clock will be corresponding to low level 0V.Therefore in M-bus bus receiving circuit, form voltage comparator by four tunnel general-purpose operation amplifiers 35 the four tunnel amplifier and peripheral circuit thereof.As shown in Figure 1, when input 23.675V voltage, diode 31 and diode 32 conductings, electric capacity 34 charges rapidly, this moment, the voltage of amplifier positive input was higher than negative input voltage, so amplifier output high level, thereby diode 30 is ended, therefore through behind the photoelectric isolating circuit, obtain high level+5V that single-chip microcomputer can detect.When input 22.75V voltage, electric capacity 34 begins by resistance 8 discharges, in capacitor discharge time T0, amplifier positive input voltage is lower than negative input voltage, so amplifier output low level, thereby make diode 30 conductings, therefore, will obtain the low level 0V that single-chip microcomputer can detect through behind optocoupler 39 spacer assemblys.According to the needs of circuit design, in this patent, to choose electric capacity 34 and be 10uF, resistance 18 is 510K Ω.When the M-bus main frame sends data,, can cause the minor fluctuations of electric current in the bus because slave sends the problem of the inner constant-current source of chip TSS721A.By current sensing means, can turn back to the device output, though fluctuation voltage is very little, in this device, has still carried out suitable protection and handled, promptly among Fig. 1, a series of circuit that are connected with four tunnel general-purpose operation amplifiers 35 the 2nd pin.When sending low level, metal-oxide-semiconductor 13 ends, thereby makes four tunnel general-purpose operation amplifiers, 35 output high level, and when sending high level, but owing to have electric capacity 29 and resistance 7, metal-oxide-semiconductor 13 could conducting behind the elapsed time T1.In time T 1, it is stable that slave sends the inner constant-current source of chip TSS721A, the output high level that four tunnel general-purpose operation amplifiers 35 can be stable.So just can the assurance device steady operation.
Claims (4)
1. M-Bus bus host interface arrangement, comprise M-Bus bus host transtation mission circuit and receiving circuit, it is characterized in that, described transtation mission circuit comprises N-channel MOS pipe (15) and is attached thereto the P channel MOS tube (33) that connects, receiving circuit comprises operational amplifier (35) and is attached thereto the optocoupler (39) that connects, described operational amplifier first via amplifier and triode (36), to detect voltage amplification, constitute the voltage-tracing device by four tunnel general-purpose operation amplifiers (35) the second tunnel amplifiers, be used to stablize the voltage signal of four tunnel general-purpose operation amplifier (35) first via output, form substracting unit by four tunnel general-purpose operation amplifier (35) Third Road amplifiers and peripheral circuit, form voltage comparator by four tunnel general-purpose operation amplifiers (35) the four tunnel amplifier and peripheral circuit thereof.
2. according to the described M-Bus bus host of claim 1 interface arrangement, it is characterized in that described N-channel MOS pipe (15) uses 2N700, described P channel MOS tube (33) uses 9530.
3. according to the described M-Bus bus host of claim 1 interface arrangement, it is characterized in that described operational amplifier (35) adopts LM348.
4. according to the described M-Bus bus host of claim 1 interface arrangement, it is characterized in that described optocoupler (39) adopts 6N139.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610043225 CN1819522B (en) | 2006-03-16 | 2006-03-16 | M-Bus host interface device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610043225 CN1819522B (en) | 2006-03-16 | 2006-03-16 | M-Bus host interface device |
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| CN1819522A CN1819522A (en) | 2006-08-16 |
| CN1819522B true CN1819522B (en) | 2011-11-16 |
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| CN 200610043225 Expired - Fee Related CN1819522B (en) | 2006-03-16 | 2006-03-16 | M-Bus host interface device |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143506A (en) * | 2010-10-20 | 2011-08-03 | 华为终端有限公司 | Management processing method, management processing device and management processing system for wireless repeater |
| CN102143509B (en) * | 2010-12-16 | 2014-04-02 | 华为终端有限公司 | Method, device and system for managing wireless repeater by using access point (AP) |
| CN101995876B (en) * | 2010-12-18 | 2012-08-15 | 重庆市智能水表有限责任公司 | M-BUS controller |
| CN102306444B (en) * | 2011-05-13 | 2013-03-13 | 浙江正泰中自控制工程有限公司 | Receiving circuit of meter-BUS (M-BUS) master station and data receiving method for receiving circuit |
| CN103728951B (en) * | 2014-01-06 | 2017-10-20 | 深圳市兴源智能仪表科技有限公司 | A kind of current regulator diode circuit of meter bus slave unit interface |
| CN105490905B (en) * | 2015-12-30 | 2018-11-27 | 无锡华润矽科微电子有限公司 | bus communication receiving end decoding circuit |
| CN106209543B (en) * | 2016-07-14 | 2019-07-12 | 珠海优特物联科技有限公司 | A kind of bidirectional bus telecommunication circuit and communication means |
| CN106558213A (en) * | 2016-12-09 | 2017-04-05 | 杭州西力智能科技股份有限公司 | A kind of four table integrated information acquisition converters |
| CN107797957B (en) * | 2017-11-17 | 2024-01-23 | 华立科技股份有限公司 | Low-cost M-BUS host communication circuit |
| CN108919360A (en) * | 2018-07-12 | 2018-11-30 | 山东科技大学 | A kind of conveyance conduit apparatus for detecting human body based on capacitance detecting |
Citations (3)
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|---|---|---|---|---|
| CN1529134A (en) * | 2003-10-10 | 2004-09-15 | ��������˹�����տ����� | Inductive temperature-humidity-pressure detecting method and apparatus |
| CN1588472A (en) * | 2004-07-19 | 2005-03-02 | 杭州利尔达单片机技术有限公司 | Remote data meter recording system |
| CN2741121Y (en) * | 2004-07-19 | 2005-11-16 | 杭州利尔达单片机技术有限公司 | Remote electric charging system |
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2006
- 2006-03-16 CN CN 200610043225 patent/CN1819522B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529134A (en) * | 2003-10-10 | 2004-09-15 | ��������˹�����տ����� | Inductive temperature-humidity-pressure detecting method and apparatus |
| CN1588472A (en) * | 2004-07-19 | 2005-03-02 | 杭州利尔达单片机技术有限公司 | Remote data meter recording system |
| CN2741121Y (en) * | 2004-07-19 | 2005-11-16 | 杭州利尔达单片机技术有限公司 | Remote electric charging system |
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Granted publication date: 20111116 Termination date: 20120316 |