CN113645109A - M-Bus interface circuit for acquisition terminal - Google Patents
M-Bus interface circuit for acquisition terminal Download PDFInfo
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- CN113645109A CN113645109A CN202110004451.2A CN202110004451A CN113645109A CN 113645109 A CN113645109 A CN 113645109A CN 202110004451 A CN202110004451 A CN 202110004451A CN 113645109 A CN113645109 A CN 113645109A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40228—Modbus
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Abstract
The invention discloses an M-Bus interface circuit for an acquisition terminal, which comprises a switch type M-Bus transmitting circuit, a sampling circuit, a capacitive coupling type M-Bus receiving circuit and an M-Bus overload protection circuit. The switching type M-Bus sending circuit can select a proper voltage stabilizer according to the number of the nodes to meet the load requirements under different environments; the sampling resistor with smaller resistance value is used in the sampling circuit, so that the bus voltage drop is smaller when the load is heavy, the resistance loss is lower, and the condition that the communication fails due to the self parameter change caused by heating is avoided; in a capacitive coupling type M-Bus receiving circuit, a Bus signal is coupled, static current and interference signals on a Bus are eliminated, and only a current change signal specified by an M-Bus protocol is extracted to make a best-matched signal amplification circuit; in the M-Bus overload protection circuit, when the current of the interface node exceeds I3 milliampere, an overload protection signal is output, and the safety and the reliability of the circuit are ensured.
Description
Technical Field
The invention relates to the field of design of M-Bus interface circuits, in particular to an M-Bus interface circuit for an acquisition terminal.
Background
The M-Bus is one of wired methods commonly used in the field of meter reading, such as reading consumption measuring instruments of heat meters and water meters, and external devices can obtain power through the Bus. In the aspect of energy consumption, power is supplied to equipment only during meter reading, and power is not supplied during idle time. In the aspect of construction, the two-wire system construction is simple and convenient, the loading capacity is strong, the communication distance is long, and the method can adapt to the fluctuation of the power grid voltage fluctuation.
However, when the existing M-Bus collection equipment works, a load may be hung on more than 100 water meters, and some water meters do not meet the specification, the current drawn by the water meters is different, the load on the Bus is too heavy, the communication of the on-site M _ Bus fails, and the on-site M _ Bus communication fails, and the on-site M _ Bus collection equipment is expressed as insufficient on-load capacity. In a common M _ Bus receiving circuit, a large sampling resistor is often relied on, when a load current is large, a Bus voltage drop is large, heat generation is serious, resistance loss is high, and self parameters are easy to change, so that communication failure is caused. Secondly, the common receiving circuit processes the quiescent current on the Bus together with the current change signal carrying data specified by the M-Bus protocol, and the quiescent current and the existing interference under different load conditions on the Bus affect the reliability of the received signal. In addition, the receiving circuit is not provided with a reasonable interface overcurrent detection current value, and circuit devices are easily damaged.
Disclosure of Invention
In order to overcome the technical defects of the background, the invention provides an M-Bus interface circuit for an acquisition terminal, which comprises a switch type M-Bus transmitting circuit, a sampling circuit, a capacitive coupling type M-Bus receiving circuit and an M-Bus overload protection circuit, wherein:
the switching type M-Bus sending circuit can select proper linear voltage regulators according to the number of the slave nodes so as to meet the load requirements under different field environments. If the number of the slave nodes is less than X, the linear voltage regulator with the output current I1 is selected, and if the number of the slave nodes is more than X, the linear voltage regulator with the output current capability I2 is selected. The number of nodes is increased, the quiescent current on the bus is also increased, and overcurrent burnout is prevented by selecting a resistor with proper encapsulation and proper resistance;
the sampling resistor used by the sampling circuit is only R ohm, when the load current is larger, the bus voltage drop is not too large, the resistance loss is reduced, and the condition that the communication fails due to the change of the parameters of the device caused by heating is avoided;
the capacitive coupling type M-Bus receiving circuit has the advantages that due to the fact that the sampling resistor is small, in order to avoid the situation that a sampling signal cannot be accurately identified when the sampling signal is small, the receiving circuit conducts first-stage amplification on the sampling signal and then conducts coupling processing. In order to improve the reliability of received signals, under the condition of ensuring the communication speed required by the specification, coupling capacitors are adopted to couple the Bus signals after primary amplification, the influence of Bus quiescent current and existing interference on the received signals under different load conditions is eliminated, only current change signals which are specified by an M-Bus protocol and carry data are extracted, and a signal amplification circuit which is matched with the extracted signals is made;
the M-Bus overload protection circuit outputs an overload protection signal when the current of the loading node of the M-Bus interface exceeds I3 milliampere, so that the safety and reliability of circuit equipment are ensured;
the connection relationship is as follows: the input end of the switch type M-Bus transmitting circuit is connected with the MCU to transmit signals, and the output end of the switch type M-Bus transmitting circuit is connected with the M-Bus interface signals; the M-Bus interface is connected with the sampling circuit through signals; the acquisition signal of the sampling circuit is connected with a capacitive coupling M-Bus receiving circuit; the overload protection signal output by the capacitive coupling type M-Bus receiving circuit is connected with the M-Bus overload protection circuit; the M-Bus interface is connected with external measuring equipment through double leads.
The switch type M-Bus sending circuit comprises an MCU sending signal TXD _ MBUS, a power supply VCC1, a current limiting resistor R1, R4, a voltage dividing resistor R2, a voltage dividing resistor R3, a sending control triode VT1, a control MOS tube VT2, a linear voltage regulator D1, a voltage stabilizing tube VP1, an anti-reflection diode VD1, a VD2, a TVS tube VP2, a VP3, a VP4, a fuse RT1, a filter capacitor C1, an M-Bus interface signal MBUS +, MBUS-. The connection relation is that an MCU sending signal TXD _ MBUS is connected with a resistor R, the other end of R is connected with a VT base electrode, a VT sending electrode is connected with a reference ground, a VT collector electrode is connected with R, the other end of R is connected with an R grid electrode, a VT source electrode is connected with the other end of R and VCC, a pin 3 of D is connected with VCC and C, the other end of C is connected with the reference ground, a pin 2 of D is connected with a VP cathode and R, a VP anode is connected with a reference ground, a pin 1 of D is connected with the other end of R and a VD anode, the VD cathode is connected with a VD anode and a VT drain electrode, the VD cathode is connected with a VP cathode, a VP cathode and RT, the VP anode is connected with the reference ground, the other end of RT is connected with a bus signal MBUS +, the VP anode is connected with bus signals MBUS-, the VP cathode, and the VP anode is connected with the reference ground.
The sampling circuit comprises M-Bus interface signals MBUS +, MBUS-, sampling resistors R5 and R6 and a filter capacitor C3. The connection relationship is MBUS + connection R5, the other end of R5 is connected with R6, C3 and MBUS-, and the other ends of R6 and C3 are connected with a reference ground.
The capacitive coupling type M-Bus receiving circuit comprises a sampling signal input MBUS-, a power supply VCC2, a current limiting resistor R7, R13, a voltage dividing resistor R8, R9, R11, R12, R14, R15, a pull-up resistor R16, a pull-down resistor R10, a diode VD4, a filter capacitor C4, C6, C7, C8, a coupling capacitor C5, operational amplifiers N1, N2, a comparator N3, an M-Bus overload protection circuit input signal B3, and an MCU receiving signal RXD _ MBUS. The connection relation is MBUS-connection R7, the other end of R7 is connected with the same input end of N1, the input end of N1 inverse term is connected with R8 and R9, the other end of R9 is connected with reference ground, the output end of N9 is connected with the other end of R9, C9 and B9, C9 is connected with the negative electrode of VD 9, R9 and the same input end of N9, the positive electrode of VD 9 is connected with reference ground, the other end of R9 is connected with reference ground, the input end of N9 inverse term is connected with R9 and R9, the other end of R9 is connected with reference ground, R9 is connected with the output end of N9 and R9, R9 is connected with the input end of N9, VCC 9 is connected with C9 and R9, the same input end of N9, the R9 is connected with reference ground, the other end of N9 is connected with RXD _ MBUS-connection, VCC 9, C9 and N9 are connected with power supply ground, and the other ends of R9 and N9.
The M-Bus overload protection circuit comprises a power supply VCC2, an input signal B3 of the M-Bus overload protection circuit, a current limiting resistor R17, voltage dividing resistors R18 and R19, filter capacitors C9 and C10, a comparator N4, a pull-up resistor R20 and an overvoltage monitoring signal V _ Detect. The connection relation is that B3 is connected with R17, the other end of R17 is connected with an N4 reverse input end, VCC2 is connected with R18, C9 and C10, the other ends of C9 and C10 are connected with a reference ground, R18 is connected with R19 and N4 homodromous input ends, the other end of R19 is connected with the reference ground, the output end of N4 is connected with R20 and V _ Detect, and the other end of R20 is connected with VCC 2.
The invention has the beneficial effects that: the invention provides an M-Bus interface circuit for an acquisition terminal, wherein a switching type M-Bus sending circuit can select a proper linear voltage stabilizer according to the number of slave nodes so as to meet the load requirements under different field environments; the sampling resistor in the sampling circuit is only R ohm, when the load current is larger, the bus voltage drop is not too large, the resistance loss is reduced, and the condition that the communication fails due to the change of the parameters of the device caused by heating is avoided; in a capacitive coupling type M-Bus receiving circuit, a coupling capacitor is adopted to couple a Bus signal after primary amplification, the influence of Bus quiescent current and existing interference on the received signal under different load conditions is eliminated, only a current change signal which is specified by an M-Bus protocol and carries data is extracted, and a signal amplification circuit which is matched with the extracted signal is made according to the extracted signal; in the M-Bus overload protection circuit, when the current of the loading node of the M-Bus interface exceeds I3 milliampere, an overload protection signal is output, and the safety and the reliability of circuit equipment are ensured.
Drawings
FIG. 1 is a diagram of an M-Bus interface circuit for an acquisition terminal according to the present invention;
FIG. 2 is a switching M-Bus transmitter circuit for an M-Bus interface circuit of an acquisition terminal according to the present invention;
FIG. 3 is a sampling circuit for the M-Bus interface circuit of the acquisition terminal of the present invention;
FIG. 4 is a capacitively coupled M-Bus receiving circuit for an M-Bus interface circuit of an acquisition terminal according to the present invention;
FIG. 5 is a M-Bus overload protection circuit for an M-Bus interface circuit of an acquisition terminal according to the present invention.
Detailed Description
So that those skilled in the art can better understand the present invention and can better understand the objects, features, and advantages of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description, which are provided for illustration purposes only and are not limiting.
Fig. 1 is a structural diagram of an M-Bus interface circuit for an acquisition terminal according to the present invention. As shown in the figure, the M-Bus interface circuit for the acquisition terminal comprises a switch type M-Bus transmitting circuit 1, a sampling circuit 2, a capacitive coupling type M-Bus receiving circuit 3 and an M-Bus overload protection circuit 4. The connection relationship is that the input end of the switch type M-Bus transmitting circuit 1 is connected with the MCU transmitting signal, and the output end is connected with the M-Bus interface signal; the M-Bus interface is connected with the sampling circuit 2 through signals; the acquisition signal of the sampling circuit 2 is connected with a capacitive coupling M-Bus receiving circuit 3; the overload protection signal output by the capacitive coupling type M-Bus receiving circuit 3 is connected with an M-Bus overload protection circuit 4; the M-Bus interface is connected with external measuring equipment through double leads.
Fig. 2 shows a switching type M-Bus transmission circuit of the present invention. The switch type M-Bus sending circuit comprises an MCU sending signal TXD _ MBUS, a power supply VCC1, a current limiting resistor R1, R4, a voltage dividing resistor R2, a voltage dividing resistor R3, a sending control triode VT1, a control MOS tube VT2, a linear voltage stabilizer D1, a voltage stabilizing tube VP1, an anti-reflection diode VD1, a VD2, a TVS tube VP2, a VP3, a VP4, a fuse RT1, a filter capacitor C1, an M-Bus interface signal MBUS +, MBUS-. The connection relation is that an MCU sending signal TXD _ MBUS is connected with a resistor R, the other end of R is connected with a VT base electrode, a VT sending electrode is connected with a reference ground, a VT collector electrode is connected with R, the other end of R is connected with an R grid electrode, a VT source electrode is connected with the other end of R and VCC, a pin 3 of D is connected with VCC and C, the other end of C is connected with the reference ground, a pin 2 of D is connected with a VP cathode and R, a VP anode is connected with a reference ground, a pin 1 of D is connected with the other end of R and a VD anode, the VD cathode is connected with a VD anode and a VT drain electrode, the VD cathode is connected with a VP cathode, a VP cathode and RT, the VP anode is connected with the reference ground, the other end of RT is connected with a bus signal MBUS +, the VP anode is connected with bus signals MBUS-, the VP cathode, and the VP anode is connected with the reference ground.
For example, the linear voltage regulator can be selected according to the number of the slave nodes so as to meet the on-load requirements in different field environments. If the number of the slave nodes is less than 60, the linear voltage regulator KIA78L05F with the output current of 150mA is selected, and if the number of the slave nodes is more than 60, the linear voltage regulator L7805 with the output current capability of 1.5A is selected. The number of nodes is increased, so that the quiescent current on the bus is also increased, and overcurrent burnout is prevented by selecting a resistor RT1 with proper packaging and proper resistance.
Fig. 3 shows a sampling circuit of the present invention. The sampling circuit comprises M-Bus interface signals MBUS +, MBUS-, sampling resistors R5 and R6 and a filter capacitor C3. The connection relationship is MBUS + connection R5, the other end of R5 is connected with R6, C3 and MBUS-, and the other ends of R6 and C3 are connected with a reference ground.
Fig. 4 shows a capacitively coupled M-Bus receiver circuit according to the present invention. The capacitive coupling type M-Bus receiving circuit comprises a sampling signal input MBUS-, a power supply VCC2, a current limiting resistor R7, R13, a voltage dividing resistor R8, R9, R11, R12, R14, R15, a pull-up resistor R16, a pull-down resistor R10, a diode VD4, a filter capacitor C4, C6, C7, C8, a coupling capacitor C5, operational amplifiers N1, N2, a comparator N3, an M-Bus overload protection circuit input signal B3, and an MCU receiving signal RXD _ MBUS. The connection relation is MBUS-connection R7, the other end of R7 is connected with the same input end of N1, the input end of N1 inverse term is connected with R8 and R9, the other end of R9 is connected with reference ground, the output end of N9 is connected with the other end of R9, C9 and B9, C9 is connected with the negative electrode of VD 9, R9 and the same input end of N9, the positive electrode of VD 9 is connected with reference ground, the other end of R9 is connected with reference ground, the input end of N9 inverse term is connected with R9 and R9, the other end of R9 is connected with reference ground, R9 is connected with the output end of N9 and R9, R9 is connected with the input end of N9, VCC 9 is connected with C9 and R9, the same input end of N9, the R9 is connected with reference ground, the other end of N9 is connected with RXD _ MBUS-connection, VCC 9, C9 and N9 are connected with power supply ground, and the other ends of R9 and N9.
For example, a high-precision sampling resistor of only 0.15 ohm is selected in the sampling circuit, and on the premise of ensuring the maximum receiving power, the resistance value of the sampling resistor and the ratio of R8 to R9 in the capacitive coupling type M-Bus receiving circuit are adjusted, so that the amplitude of the Bus signal after primary amplification can be adjusted.
Fig. 5 shows an M-Bus overload protection circuit of the present invention. The M-Bus overload protection circuit comprises a power supply VCC2, an input signal B3 of the M-Bus overload protection circuit, a current limiting resistor R17, voltage dividing resistors R18 and R19, filter capacitors C9 and C10, a comparator N4, a pull-up resistor R20 and an overvoltage monitoring signal V _ Detect. The connection relation is that B3 is connected with R17, the other end of R17 is connected with an N4 reverse input end, VCC2 is connected with R18, C9 and C10, the other ends of C9 and C10 are connected with a reference ground, R18 is connected with R19 and N4 homodromous input ends, the other end of R19 is connected with the reference ground, the output end of N4 is connected with R20 and V _ Detect, and the other end of R20 is connected with VCC 2.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. An M-Bus interface circuit for an acquisition terminal, comprising a switch type M-Bus transmitting circuit, a sampling circuit, a capacitance coupling type M-Bus receiving circuit and an M-Bus overload protection circuit, wherein:
the switching type M-Bus transmitting circuit can select proper linear voltage regulators according to the number of slave nodes so as to meet load requirements under different field environments, if the number of the slave nodes is less than X, the linear voltage regulators with output current I1 are selected, if the number of the slave nodes is more than X, the linear voltage regulators with output current capability I2 are selected, the number of the nodes is increased, static current on a Bus is also increased, and overcurrent burnout is prevented by selecting proper packaging and resistors with proper resistance values;
the sampling resistor used by the sampling circuit is only R ohm, when the load current is larger, the bus voltage drop is not too large, the resistance loss is reduced, and the condition that the communication fails due to the change of the parameters of the device caused by heating is avoided;
the capacitive coupling type M-Bus receiving circuit has the advantages that due to the fact that sampling resistance is small, accurate identification cannot be achieved when a sampling signal is small, the receiving circuit conducts primary amplification on the sampling signal and then conducts coupling processing, in order to improve reliability of the receiving signal, under the condition that communication speed required by specifications is guaranteed, a Bus signal after the primary amplification is coupled through the coupling capacitor, influences of Bus quiescent current and existing interference on the receiving signal under different load conditions are eliminated, only a current change signal which is provided with data and is specified by an M-Bus protocol is extracted, and a signal amplification circuit which is matched with the extracted signal is made;
the M-Bus overload protection circuit outputs an overload protection signal when the current of the loading node of the M-Bus interface exceeds I3 milliampere, so that the safety and reliability of circuit equipment are ensured;
the connection relationship is as follows: the input end of the switch type M-Bus transmitting circuit is connected with the MCU to transmit signals, and the output end of the switch type M-Bus transmitting circuit is connected with the M-Bus interface signals; the M-Bus interface is connected with the sampling circuit through signals; the acquisition signal of the sampling circuit is connected with a capacitive coupling M-Bus receiving circuit; the overload protection signal output by the capacitive coupling type M-Bus receiving circuit is connected with the M-Bus overload protection circuit; the M-Bus interface is connected with external measuring equipment through double leads.
2. The M-Bus interface circuit for the acquisition terminal as claimed in claim 1, wherein the switching type M-Bus transmission circuit comprises an MCU (microprogrammed control Unit) transmission signal TXD _ MBUS, a power supply VCC1, a current limiting resistor R1, R4, a voltage dividing resistor R2, R3, a transmission control triode VT1, a control MOS tube VT2, a linear voltage regulator D1, a voltage regulator tube VP1, anti-reflection diodes VD1, VD2, TVS tubes VP2, VP3, VP4, a fuse RT1, a filter capacitor C1, an M-Bus interface signal MBUS +, MBUS-;
the connection relation is that an MCU sending signal TXD _ MBUS is connected with a resistor R, the other end of R is connected with a VT base electrode, a VT sending electrode is connected with a reference ground, a VT collector electrode is connected with R, the other end of R is connected with an R grid electrode, a VT source electrode is connected with the other end of R and VCC, a pin 3 of D is connected with VCC and C, the other end of C is connected with the reference ground, a pin 2 of D is connected with a VP cathode and R, a VP anode is connected with a reference ground, a pin 1 of D is connected with the other end of R and a VD anode, the VD cathode is connected with a VD anode and a VT drain electrode, the VD cathode is connected with a VP cathode, a VP cathode and RT, the VP anode is connected with the reference ground, the other end of RT is connected with a bus signal MBUS +, the VP anode is connected with bus signals MBUS-, the VP cathode, and the VP anode is connected with the reference ground.
3. The M-Bus interface circuit for the acquisition terminal as claimed in claim 1, wherein the sampling circuit comprises M-Bus interface signals MBUS +, MBUS-, sampling resistors R5, R6, a filter capacitor C3;
the connection relationship is MBUS + connection R5, the other end of R5 is connected with R6, C3 and MBUS-, and the other ends of R6 and C3 are connected with a reference ground.
4. The M-Bus interface circuit for the acquisition terminal as claimed in claim 1, wherein the capacitively coupled M-Bus receiving circuit comprises a sampling signal input MBUS-, a power supply VCC2, current limiting resistors R7, R13, voltage dividing resistors R8, R9, R11, R12, R14, R15, a pull-up resistor R16, a pull-down resistor R10, a diode VD4, filter capacitors C4, C6, C7, C8, a coupling capacitor C5, operational amplifiers N1, N2, a comparator N3, an M-Bus overload protection circuit input signal B3, and an MCU receiving signal RXD _ MBUS;
the connection relation is MBUS-connection R7, the other end of R7 is connected with the same input end of N1, the input end of N1 inverse term is connected with R8 and R9, the other end of R9 is connected with reference ground, the output end of N9 is connected with the other end of R9, C9 and B9, C9 is connected with the negative electrode of VD 9, R9 and the same input end of N9, the positive electrode of VD 9 is connected with reference ground, the other end of R9 is connected with reference ground, the input end of N9 inverse term is connected with R9 and R9, the other end of R9 is connected with reference ground, R9 is connected with the output end of N9 and R9, R9 is connected with the input end of N9, VCC 9 is connected with C9 and R9, the same input end of N9, the R9 is connected with reference ground, the other end of N9 is connected with RXD _ MBUS-connection, VCC 9, C9 and N9 are connected with power supply ground, and the other ends of R9 and N9.
5. The M-Bus interface circuit for the acquisition terminal as claimed in claim 1, wherein the M-Bus overload protection circuit comprises a power supply VCC2, an M-Bus overload protection circuit input signal B3, a current limiting resistor R17, voltage dividing resistors R18 and R19, filter capacitors C9 and C10, a comparator N4, a pull-up resistor R20, and an overvoltage monitoring signal V _ Detect;
the connection relation is that B3 is connected with R17, the other end of R17 is connected with an N4 reverse input end, VCC2 is connected with R18, C9 and C10, the other ends of C9 and C10 are connected with a reference ground, R18 is connected with R19 and N4 homodromous input ends, the other end of R19 is connected with the reference ground, the output end of N4 is connected with R20 and V _ Detect, and the other end of R20 is connected with VCC 2.
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| CN202110004451.2A CN113645109A (en) | 2021-01-04 | 2021-01-04 | M-Bus interface circuit for acquisition terminal |
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| CN202110004451.2A CN113645109A (en) | 2021-01-04 | 2021-01-04 | M-Bus interface circuit for acquisition terminal |
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| CN103728903A (en) * | 2013-12-26 | 2014-04-16 | 华立仪表集团股份有限公司 | User terminal |
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| CN108417002A (en) * | 2018-04-09 | 2018-08-17 | 南通德高环境监测技术有限公司 | A kind of high-performance MBUS collectors for water meter |
| CN208208079U (en) * | 2018-04-09 | 2018-12-07 | 南通德高环境监测技术有限公司 | A kind of high-performance MBUS collector for water meter |
| CN110784235A (en) * | 2019-12-04 | 2020-02-11 | 青岛东软载波科技股份有限公司 | M-BUS host transceiver circuit |
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- 2021-01-04 CN CN202110004451.2A patent/CN113645109A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010007079A1 (en) * | 2010-02-06 | 2011-08-11 | Qundis GmbH, 99974 | Device for reading consumption values and communication methods |
| CN103728903A (en) * | 2013-12-26 | 2014-04-16 | 华立仪表集团股份有限公司 | User terminal |
| CN107464411A (en) * | 2017-09-25 | 2017-12-12 | 河南卓正电子科技有限公司 | A kind of MBUS circuits being used in automatic meter reading system |
| CN108417002A (en) * | 2018-04-09 | 2018-08-17 | 南通德高环境监测技术有限公司 | A kind of high-performance MBUS collectors for water meter |
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| CN110784235A (en) * | 2019-12-04 | 2020-02-11 | 青岛东软载波科技股份有限公司 | M-BUS host transceiver circuit |
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Application publication date: 20211112 |