CN207503441U - MBUS buses send signaling conversion circuit - Google Patents
MBUS buses send signaling conversion circuit Download PDFInfo
- Publication number
- CN207503441U CN207503441U CN201721777377.3U CN201721777377U CN207503441U CN 207503441 U CN207503441 U CN 207503441U CN 201721777377 U CN201721777377 U CN 201721777377U CN 207503441 U CN207503441 U CN 207503441U
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- mbus
- circuit
- conversion circuit
- controller
- serial interface
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Abstract
The utility model discloses a kind of MBUS buses to send signaling conversion circuit, including the controller, rs 232 serial interface signal conversion circuit and MBUS channel selection circuits being sequentially connected in series；The level conversion for the data that rs 232 serial interface signal conversion circuit sends controller is MBUS signal level and is sent to MBUS channel selection circuits；MBUS channel selection circuits receive the MBUS channel selecting signals that controller is sent out and select corresponding MBUS channels transmission data.The utility model realizes the communication between the signal transmitting line of the communication interface all the way of controller and the transmission signal line communications of two-way MBUS buses by reliable hardware circuit, the communication interface of controller has been saved, has greatly reduced the hardware consumption of controller；And the principle of the utility model circuit is simple, and circuit is simple and reliable, and of low cost.
Description
Technical field
The utility model sends signaling conversion circuit more particularly to a kind of MBUS buses.
Background technology
With the development and the improvement of people's living standards of national economy technology, bus communication technology has become industry
Essential means of communication in production and electric/electronic device.MBUS buses are widely used in the meterings such as water meter, ammeter or gas meter
In instrument, the important function of data communication carry.
At present, four table collection copy (ammeter, water meter, gas meter and hotlist) application it is more and more extensive.Currently, four table collection copy conversion
The external MBUS interfaces of device have two-way, i.e. two-way MBUS interfaces substantially.Two-way MBUS interfaces will be needed through serial ports and converter
CPU communication, i.e., two-way MUBS interfaces are connect respectively with the two-way communication interface of CPU.
But due to CPU at present on the market, communication interface is more rare, therefore current two-way MBUS communications connect
Mouth needs to occupy the two-way communication bus of CPU, very occupies the hardware resource of CPU.
Utility model content
The purpose of this utility model is to provide the signal transmissions in a kind of serial communication interface all the way that can realize CPU
The MBUS buses that circuit communicates with the transmission signal wire of two-way MBUS buses send signaling conversion circuit.
This MBUS buses provided by the utility model send signaling conversion circuit, including controller, further include serial ports letter
Number conversion circuit and MBUS channel selection circuits；Controller, rs 232 serial interface signal conversion circuit and MBUS channel selection circuits are gone here and there successively
It connects；The rs 232 serial interface signal of controller sends pin and sends data to rs 232 serial interface signal conversion circuit, and rs 232 serial interface signal conversion circuit will control
The level conversion for the data that device is sent is MBUS signal level and is sent to MBUS channel selection circuits；MBUS channel selection circuits
The MBUS channel selecting signals that controller is sent out are received, and corresponding MBUS are selected to lead to according to the MBUS channel selecting signals of reception
Road transmission data.
The rs 232 serial interface signal conversion circuit is the level signal conversion circuit being made of switching tube；Level signal conversion electricity
The rs 232 serial interface signal of controller is sent the level conversion of the serial data that pin is sent as the level of MBUS bus signals and defeated by road
Go out to MBUS channel selection circuits.
The rs 232 serial interface signal conversion circuit further includes isolation circuit；Isolation circuit is connected to controller and rs 232 serial interface signal turns
It changes between circuit；After the data that the rs 232 serial interface signal transmission pin of controller is sent carry out electrical isolation by isolation circuit, then it is defeated
Enter to rs 232 serial interface signal conversion circuit and carry out level conversion.
The isolation circuit is optical coupling isolation circuit.
The MBUS channel selection circuits include first passage selection circuit and second channel selection circuit；First passage
Selection circuit includes first switch pipe, the first pull-up resistor, the first current-limiting resistance and the first output resistance；Second channel selection electricity
Road includes second switch pipe, the second pull-up resistor, the second current-limiting resistance and the second output resistance；The MBUS channels of controller output
Selection signal connects the control terminal of first switch pipe by the first current-limiting resistance, and the control terminal of first switch pipe is also by first
Pull-up resistor connects the output terminal of rs 232 serial interface signal conversion circuit, and movable end one end of first switch pipe equally connects rs 232 serial interface signal conversion
The output terminal of circuit, the movable end other end of first switch pipe export the anode transmission of first via MBUS channels by output resistance
Signal, while the movable end other end of first switch pipe also sends signal directly as the cathode of first via MBUS channels；Control
The MBUS channel selecting signals of device output also connect the control terminal of second switch pipe by the second current-limiting resistance, second switch pipe
Control terminal also connects the output terminal of rs 232 serial interface signal conversion circuit by the second pull-up resistor, and two end of movable end of second switch pipe is same
Sample connects the output terminal of rs 232 serial interface signal conversion circuit, and the movable end other end of second switch pipe exports the second tunnel by output resistance
The anode of MBUS channels sends signal, while the movable end other end of second switch pipe is also directly as the second road MBUS channels
Cathode sends signal；The MBUS channel selecting signals of controller output are by controlling the conducting of first switch pipe and second switch pipe
And shutdown, realize the output terminal of rs 232 serial interface signal conversion circuit and the connection of first via MBUS channels or rs 232 serial interface signal conversion circuit
Output terminal and the second road MBUS channels connection.
The MBUS channel selection circuits further include isolation circuit；The MBUS that isolation circuit is connected to controller output leads to
In road selection signal, be used to implement controller output MBUS channel selecting signals and first passage selection circuit it is electrical every
From and realize controller output MBUS channel selecting signals and second channel selection circuit electrical isolation.
The MBUS channel selecting signals of the controller output are the opposite polarity MBUS channel selecting signals of two-way.
This MBUS buses provided by the utility model send signaling conversion circuit, are realized by reliable hardware circuit
Communication between the signal transmitting line of the communication interface all the way of controller and the transmission signal communication circuit of two-way MBUS buses,
The serial communication interface all the way that controller can be implemented separately carries out two-way MBUS buses the transmission of signal, has saved control
The serial communication interface of device greatly reduces the hardware consumption of controller；And the principle of the utility model circuit is simple, electricity
Road is simple and reliable, and of low cost.
Description of the drawings
Fig. 1 is that the MBUS buses of the utility model send the functional block diagram of signaling conversion circuit.
Fig. 2 is the circuit theory that the MBUS buses of the utility model send the rs 232 serial interface signal conversion circuit of signaling conversion circuit
Figure.
Fig. 3 is the circuit theory that the MBUS buses of the utility model send the MBUS channel selection circuits of signaling conversion circuit
Figure.
Specific embodiment
The functional block diagram of signaling conversion circuit is sent for the MBUS buses of the utility model as shown in Figure 1：This practicality is new
This MBUS buses that type provides send signaling conversion circuit, are selected including controller, rs 232 serial interface signal conversion circuit and MBUS channels
Select circuit；Controller, rs 232 serial interface signal conversion circuit and MBUS channel selection circuits are sequentially connected in series；The rs 232 serial interface signal of controller is sent
Pin sends data to rs 232 serial interface signal conversion circuit, and the level conversion for the data that rs 232 serial interface signal conversion circuit sends controller is
MBUS signal levels are simultaneously sent to MBUS channel selection circuits；MBUS channel selection circuits receive the MBUS channels that controller is sent out
Selection signal, and corresponding MBUS channels transmission data is selected according to the MBUS channel selecting signals of reception.
It is illustrated in figure 2 the electricity of the rs 232 serial interface signal conversion circuit of the MBUS buses transmission signaling conversion circuit of the utility model
Road schematic diagram：Rs 232 serial interface signal conversion circuit is the level signal conversion circuit being made of switching tube；Level signal conversion circuit will
The level conversion that the rs 232 serial interface signal of controller sends the serial data that pin is sent is the level of MBUS bus signals and exports extremely
MBUS channel selection circuits；And the also included isolation circuit of rs 232 serial interface signal conversion circuit；Isolation circuit be connected to controller and
Between rs 232 serial interface signal conversion circuit；The rs 232 serial interface signal of controller send data that pin sends by isolation circuit carry out electrically every
From rear, then it is input to rs 232 serial interface signal conversion circuit and carries out level conversion.
In figure, optical coupling isolation circuit includes communication pull-up resistor R199, driving pull-up resistor R205 and opto-coupler chip D20；
Level shifting circuit then includes switching tube V66, switching tube pull-up resistor R200, switching tube pull down resistor R209 and output terminal two
Pole pipe V67 and V68；The rs 232 serial interface signal of controller sends the hair that the data signals of serial (TXD) that pin is sent is directly connected to optocoupler
2 foot of pipe is penetrated, 2 foot of transmitting tube of optocoupler also believes the rs 232 serial interface signal positive pole of pull-up resistor R199 connection controllers (in figure all
Shown V3P3)；1 foot of transmitting tube of optocoupler is then by driving the rs 232 serial interface signal power supply of pull-up resistor R205 connection controllers just
Pole；3 foot of reception pipe of optocoupler is directly connected to the control of switching tube V66 by switching tube pull down resistor R209 connection earth signals
End processed, while also pass through the high-voltage power supply anode (MBUS_H_ shown in figure of switching tube pull-up resistor R200 connection MBUS buses
ISO)；4 feet of the reception pipe of optocoupler are then directly connected to the high-voltage power supply anode of MBUS buses；Movable end one end of switching tube is straight
The high-voltage power supply anode of MBUS buses is connect in succession, and the movable end other end of switching tube is then exported by output terminal diode V68
MBUS+ signals；In addition, the low voltage power supply anode (MBUS_L_ISO shown in figure) of MBUS buses then directly passes through output terminal two
Pole pipe V67 is directly connected to MBUS+ signals.
The course of work of foregoing circuit is：
If the serial ports transmitting terminal TXD outputs of controller are low level, TXD signal levels are low level, test optocoupler
Transmitting tube conducting (power supply V3P3 connect low level by resistance R205 with optocoupler transmitting tube), the reception pipe of optocoupler is connected, opens
The control terminal for closing pipe V66 is directly connect with MBUS_H_ISO signals, therefore the control terminal of switching tube V66 is high level, is opened at this time
Close the movable end conducting of pipe V66, therefore the conducting movable end and output diode that MBUS_H_ISO signals pass through switching tube V66
V68 output signals so that the level on MBUS+ signal wires is MBUS_H_ISO, is the height electricity for meeting the requirement of MBUS bus levels
Ordinary mail number；
If the serial ports transmitting terminal TXD outputs of controller are high level, TXD signal levels are high level, test optocoupler
Transmitting tube cut-off (1 foot of transmitting tube of optocoupler and the voltage of 2 feet are equal, light emitting diode cut-off), the reception pipe of optocoupler is similary
Cut-off, the control terminal of switching tube V66 is partitioned level signal of the MBUS_H_ISO voltages on resistance R209；Choose resistance R200
With the resistance value of R209 so that the level signal at switch controlled end is less than the Continuity signal of switching tube at this time so that switching tube V66
Movable end cut-off, MBUS+ signals are provided by MBUS_L_ISO voltage signals at this time, therefore are to meet on MBUS+ signal wires
The low level signal of MBUS bus levels requirement.
By the description of the above-mentioned course of work for rs 232 serial interface signal conversion circuit, can clearly confirm：Rs 232 serial interface signal
The effect of conversion circuit is the rs 232 serial interface signal of controller being transmitted, while the rs 232 serial interface signal level of controller is horizontal
(high level 3.3V, the V3P3 power supplys in figure provide) is improved to the required signal level level of MBUS bus communications (in figure
MBUS_H_ISO and MBUS_L_ISO provide).
It is illustrated in figure 3 the electricity of the MBUS channel selection circuits of the MBUS buses transmission signaling conversion circuit of the utility model
Road schematic diagram：
MBUS channel selection circuits include first passage selection circuit and second channel selection circuit；First passage selection electricity
Road includes the first optocoupler D23, the first optocoupler pull-up resistor R212, the first signal pull-up resistor R213, first switch pipe V71, the
One pull-up resistor R211, the first current-limiting resistance R214 and the first output resistance R215；Second channel selection circuit includes the second light
Coupling D24, the second optocoupler pull-up resistor R218, second signal pull-up resistor R219, second switch pipe V73, the second pull-up resistor
R217, the second current-limiting resistance R220 and the second output resistance R221；The MBUS channel selecting signals MUBS1_CTL of controller output
2 foot of transmitting tube of the first optocoupler D23 is directly connected to, simultaneously also by the first signal pull-up resistor R213 connection 3.3V positive poles
V3P3；1 foot of transmitting tube of first optocoupler then passes through the first optocoupler pull-up resistor R212 connection 3.3V positive poles V3P3；First light
3 foot of reception pipe of coupling is directly grounded, and 4 foot of reception pipe then passes through the control of the first current-limiting resistance R214 connection first switch pipes V71
End, the control terminal of first switch pipe V71 also pass through the output terminal of the first pull-up resistor R211 connection rs 232 serial interface signal conversion circuits
Movable end one end (being 3 feet of first switch pipe V71 shown in figure) of MBUS+, first switch pipe V71 equally connect rs 232 serial interface signal
The movable end other end of the output terminal MBUS+ of conversion circuit, first switch pipe V71 (are the 2 of first switch pipe V71 shown in figure
Foot) by the anode transmission signal of output resistance R215 output first via MBUS channels, while the movable end of first switch pipe is another
The cathode that first via MBUS channels are also used as in one end by protection diode V80 sends signal；
Similar, the MBUS channel selecting signals MUBS2_CTL of controller output is directly connected to the transmitting of the second optocoupler D24
2 foot of pipe, simultaneously also by second signal pull-up resistor R219 connection 3.3V positive poles V3P3；1 foot of transmitting tube of second optocoupler
Then pass through the second optocoupler pull-up resistor R218 connection 3.3V positive poles V3P3；3 foot of reception pipe of second optocoupler is directly grounded, and is connect
4 foot of closed tube then passes through the control terminal of the second current-limiting resistance R220 connection second switch pipes V73, the control terminal of second switch pipe V73
Also pass through the output terminal MBUS+ of the second pull-up resistor R217 connection rs 232 serial interface signal conversion circuits, the movable end of second switch pipe V73
The output terminal MBUS+ of the similary connection rs 232 serial interface signal conversion circuit in one end 3 feet of second switch pipe V73 (shown in figure be), second
The movable end other end (being 2 feet of second switch pipe V73 shown in figure) of switching tube V73 exports second by output resistance R221
The anode of road MBUS channels sends signal, while the movable end other end of second switch pipe is also made by protection diode V79
Cathode for the second road MBUS channels sends signal.
The effect of above-mentioned opto-coupler chip is, by the effect of photoelectric coupling, the MBUS+ signal levels and controller for being
Control level signal (V3P3 signals) carry out electrical isolation, so as to ensure the safety of circuit.
MBUS the channel selecting signals MUBS1_CTL and MUBS2_CTL of above-mentioned controller output are opposite polarity control
Signal processed, i.e., when MUBS1_CTL be high level when MUBS2_CTL be necessary for low level, when MUBS2_CTL be high level when
MUBS1_CTL is necessary for low level.
Below by taking MUBS1_CTL is high level, MUBS2_CTL is low level as an example, illustrate above-mentioned MBUS channel selectings electricity
The course of work on road：
When MUBS1_CTL is high level, then 1 foot of transmitting tube of optocoupler D23 and 2 feet are high level, at this time optocoupler D23
Transmitting tube does not shine, and 3 feet and 4 feet of reception pipe are also not turned on, and 1 foot of control terminal of switching tube V71 is pulled up by resistance R211 at this time
To MBUS+ signal levels, and 3 feet of switching tube V71 are similarly MBUS+ signal levels, therefore switching tube V71 ends, and opens at this time
The 2 foot no signals output of pipe V71 is closed, therefore no signal between MBUS1+ and MBUS-, road MBUS are deactivated；At this point, due to
MUBS2_CTL is low level, then 2 foot of transmitting tube of optocoupler D24 is low level, and 1 foot of transmitting tube is high level, then optocoupler D24
Transmitting tube lumination of light emitting diode, at this time 3 foot of reception pipe of optocoupler and 4 feet will connect, 1 foot of control terminal of switching tube V73 at this time
Voltage be partial pressure of the MBUS+ bus levels signal voltage on resistance R220；And the level signal of 3 feet of switching tube V73 is
MBUS+ bus level signals, therefore will be there are one voltage difference between 1 foot and 3 feet of switching tube V73, this voltage difference to cause out
2 foot of control terminal of pipe V73 and the conducting of 3 feet are closed, so as to which MUBS+ signals are transferred on MBUS2+ signals, realizes MBUS+ signals
Transmission.
And when MUBS2_CTL is high level, MUBS1_CTL is low level, by above-mentioned similar analysis it is found that MBUS
+ signal will be transmitted on MBUS1+ signals, equally realize the transmission of MBUS+ signals.
Two-way MBUS (MBUS1 and MBUS2) public MBUS- signals all the way in figure；MBUS- signals are passed through into sampling resistor
Ground connection can then realize that MBUS is extracted by way of resistance sampling with MBUS signals all the way receives signal.
By above-mentioned MBUS buses transmission signaling conversion circuit, in the serial communication interface all the way that can realize CPU
Signal transmitting line and the transmission signal line communications of two-way MBUS buses, i.e., above-mentioned MBUS buses provided herein send letter
Number conversion circuit, the serial communication interface all the way that CPU can be implemented separately carry out two-way MBUS buses the transmission of signal.
And MBUS signal receiving circuits corresponding with the application, then it may be used that application No. is CN201120345875.7
Circuit carry out signal reception.
Claims (7)
1. a kind of MBUS buses send signaling conversion circuit, including controller, it is characterised in that further include rs 232 serial interface signal conversion electricity
Road and MBUS channel selection circuits；Controller, rs 232 serial interface signal conversion circuit and MBUS channel selection circuits are sequentially connected in series；Controller
Rs 232 serial interface signal send pin send data to rs 232 serial interface signal conversion circuit, the number that rs 232 serial interface signal conversion circuit sends controller
According to level conversion for MBUS signal levels and be sent to MBUS channel selection circuits；MBUS channel selection circuits receive controller
The MBUS channel selecting signals sent out, and corresponding MBUS channels is selected to send number according to the MBUS channel selecting signals of reception
According to.
2. MBUS buses according to claim 1 send signaling conversion circuit, it is characterised in that the rs 232 serial interface signal turns
It is the level signal conversion circuit being made of switching tube to change circuit；Level signal conversion circuit sends the rs 232 serial interface signal of controller
The level conversion for the serial data that pin is sent is the level of MBUS bus signals and exports to MBUS channel selection circuits.
3. MBUS buses according to claim 1 send signaling conversion circuit, it is characterised in that the rs 232 serial interface signal turns
It changes circuit and further includes isolation circuit；Isolation circuit is connected between controller and rs 232 serial interface signal conversion circuit；The serial ports of controller
After the data that signal transmission pin is sent carry out electrical isolation by isolation circuit, then it is input to the progress of rs 232 serial interface signal conversion circuit
Level conversion.
4. MBUS buses according to claim 3 send signaling conversion circuit, it is characterised in that the isolation circuit is
Optical coupling isolation circuit.
5. the MBUS buses according to one of Claims 1 to 4 send signaling conversion circuit, it is characterised in that the MBUS
Channel selection circuit includes first passage selection circuit and second channel selection circuit；First passage selection circuit is opened including first
Guan Guan, the first pull-up resistor, the first current-limiting resistance and the first output resistance；Second channel selection circuit include second switch pipe,
Second pull-up resistor, the second current-limiting resistance and the second output resistance；The MBUS channel selecting signals of controller output pass through first
Current-limiting resistance connects the control terminal of first switch pipe, and the control terminal of first switch pipe also connects serial ports by the first pull-up resistor and believes
The output terminal of number conversion circuit, movable end one end of first switch pipe equally connect the output terminal of rs 232 serial interface signal conversion circuit, and
The anode that the movable end other end of one switching tube exports first via MBUS channels by output resistance sends signal, while first opens
The movable end other end for closing pipe also sends signal directly as the cathode of first via MBUS channels；The MBUS channels of controller output
Selection signal also connects the control terminal of second switch pipe by the second current-limiting resistance, and the control terminal of second switch pipe also passes through second
Pull-up resistor connects the output terminal of rs 232 serial interface signal conversion circuit, and two end of movable end of second switch pipe equally connects rs 232 serial interface signal and turns
The output terminal of circuit is changed, the movable end other end of second switch pipe exports the anode hair of the second road MBUS channels by output resistance
The number of delivering letters, while the movable end other end of second switch pipe also sends signal directly as the cathode of the second road MBUS channels；Control
The MBUS channel selecting signals of device processed output realize serial ports by controlling the turn-on and turn-off of first switch pipe and second switch pipe
The output terminal of signaling conversion circuit and the connection of first via MBUS channels or the output terminal and second of rs 232 serial interface signal conversion circuit
The connection of road MBUS channels.
6. MBUS buses according to claim 5 send signaling conversion circuit, it is characterised in that the MBUS channels choosing
It selects circuit and further includes isolation circuit；Isolation circuit is connected on the MBUS channel selecting signals of controller output, is used to implement control
The MBUS channel selecting signals of device output processed are exported with the electrical isolation of first passage selection circuit and realization controller
The electrical isolation of MBUS channel selecting signals and second channel selection circuit.
7. MBUS buses according to claim 6 send signaling conversion circuit, it is characterised in that the controller output
MBUS channel selecting signals be the opposite polarity MBUS channel selecting signals of two-way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721777377.3U CN207503441U (en) | 2017-12-14 | 2017-12-14 | MBUS buses send signaling conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721777377.3U CN207503441U (en) | 2017-12-14 | 2017-12-14 | MBUS buses send signaling conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207503441U true CN207503441U (en) | 2018-06-15 |
Family
ID=62509146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721777377.3U Withdrawn - After Issue CN207503441U (en) | 2017-12-14 | 2017-12-14 | MBUS buses send signaling conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207503441U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107862851A (en) * | 2017-12-14 | 2018-03-30 | 威胜信息技术股份有限公司 | MBUS buses send signaling conversion circuit and its conversion method |
-
2017
- 2017-12-14 CN CN201721777377.3U patent/CN207503441U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107862851A (en) * | 2017-12-14 | 2018-03-30 | 威胜信息技术股份有限公司 | MBUS buses send signaling conversion circuit and its conversion method |
| CN107862851B (en) * | 2017-12-14 | 2023-08-15 | 威胜信息技术股份有限公司 | MBUS bus transmission signal conversion circuit and conversion method thereof |
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Granted publication date: 20180615 Effective date of abandoning: 20230815 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180615 Effective date of abandoning: 20230815 |