CN204244219U - A kind of telecommunication circuit detecting RS485 interface voltage - Google Patents
A kind of telecommunication circuit detecting RS485 interface voltage Download PDFInfo
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- CN204244219U CN204244219U CN201420741961.3U CN201420741961U CN204244219U CN 204244219 U CN204244219 U CN 204244219U CN 201420741961 U CN201420741961 U CN 201420741961U CN 204244219 U CN204244219 U CN 204244219U
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Abstract
The utility model provides a kind of telecommunication circuit detecting RS485 interface voltage, comprise the optical coupling isolation circuit for receiving external signal and the signal also outside change-over circuit exporting echo signal for receiving optical coupling isolation circuit output, wherein, telecommunication circuit comprises communication control circuit, digital voltage Acquisition Circuit and isolation power supply circuits, communication control circuit is used for exporting the first control signal to optical coupling isolation circuit and exporting the second control signal to digital voltage Acquisition Circuit, digital voltage Acquisition Circuit is for receiving external signal and exporting collection signal to communication control circuit, isolation power supply circuits are used for optical coupling isolation circuit, communication control circuit, change-over circuit and digital voltage Acquisition Circuit are powered.The voltage signal gathered by voltage collection circuit is sent to after communication control circuit processes, thus realize the interface fault automatically detecting RS485, after can learning ammeter communication interface fault timely, arrange maintenance personal to repair it in time, reply normal use that communicate in time.
Description
Technical field
The utility model relates to a kind of telecommunication circuit, particularly relates to a kind of telecommunication circuit with voltage detecting function.
Background technology
In power industry, Automatic meter reading becomes more and more popular in ammeter application, this technology provides communication port to read data for ammeter, and just can complete automatic data logging by remote reading mode in most cases, for ammeter application both safety in turn saved the time.The key realizing Automatic meter reading guarantees that communication link is safe and reliable, and RS485 interface is the two-wire half-duplex operation interface that electric power is conventional.It is generally that the voltage difference adopting universal meter to detect between A port and B port can know whether this interface exists fault quickly that existing RS485 interface fault detects, and whether normal carrys out comprehensive descision RS485 interface by communication trial simultaneously.But detecting voltage needs special universal instrument, and communication check needs again the instrument of other specialties, cannot accomplish to use a kind of equipment to carry out the state judging RS485 interface.In addition, traditional RS485 communication check instrument does not possess voltage detecting function, does not have other instruments can detect RS485 interface voltage under the state not having universal instrument, and the instrument detecting RS485 Interface status is especially lacked.
Summary of the invention
The purpose of this utility model is to provide a kind of telecommunication circuit detecting RS485 interface fault.
In order to realize the purpose of this utility model, the utility model provides a kind of telecommunication circuit detecting RS485 interface voltage, comprise the optical coupling isolation circuit for receiving external signal and the signal also outside change-over circuit exporting echo signal for receiving optical coupling isolation circuit output, wherein, telecommunication circuit comprises communication control circuit, digital voltage Acquisition Circuit and isolation power supply circuits, communication control circuit is used for exporting the first control signal to optical coupling isolation circuit and exporting the second control signal to digital voltage Acquisition Circuit, digital voltage Acquisition Circuit is for receiving external signal and exporting collection signal to communication control circuit, isolation power supply circuits are used for optical coupling isolation circuit, communication control circuit, change-over circuit and digital voltage Acquisition Circuit are powered.
From such scheme, the external signal exported by RS485 interface is received by digital voltage Acquisition Circuit, in order to improve acquisition precision, ensure the accuracy of its voltage measurement, optical coupling isolation circuit and digital voltage Acquisition Circuit is controlled by communication control circuit, namely control optical coupling isolation circuit to block, change-over circuit is made not affect the sampling of digital voltage Acquisition Circuit, a receiving terminal ground connection of control figure voltage collection circuit simultaneously, the voltage signal eventually passing the collection of digital voltage Acquisition Circuit is sent to after communication control circuit processes, exportable host computer or remote terminal computer etc. carry out Real-Time Monitoring, thus realize the interface fault automatically detecting RS485, after ammeter communication interface fault can being learnt in time and easily, maintenance personal is arranged to repair it in time, timely reply communication is normal to be used.
Further scheme is, optical coupling isolation circuit comprises the first photoelectrical coupler and the second photoelectrical coupler, the emitter of the first photoelectrical coupler is electrically connected with the collector electrode of the second photoelectrical coupler, the emitter of the second photoelectrical coupler is electrically connected with the collector electrode of the first photoelectrical coupler, the emitter of the first fiber coupler receives external signal, and the emitter of the second fiber coupler outputs signal to change-over circuit.
Further scheme is, first control signal comprises the first photoelectrical coupler control signal and the second photoelectrical coupler control signal, the negative electrode of the first photoelectrical coupler receives the first photoelectrical coupler control signal, and the negative electrode of the second photoelectrical coupler receives the second photoelectrical coupler control signal.
Therefore, by the photoelectrical coupler in optical coupling isolation circuit, prevent the interference caused because there being the connection of electricity, its antijamming capability is strong, isolation performance between strong and weak electricity is good, and effectively can be controlled the blocking-up of photoelectrical coupler by communication control circuit, thus improves certainty of measurement.
Further scheme is, external signal comprises the first external signal and the second external signal, digital voltage Acquisition Circuit comprises the first receiving terminal, second receiving terminal, first resistance, second resistance, first triode and the first signal output part, first receiving terminal is for receiving the first external signal, second receiving terminal is for receiving the second external signal, first resistance and the second resistant series are between the first receiving terminal and the second receiving terminal, first signal output part is connected electrically between the first resistance and the second resistance, the grounded emitter of triode, the base stage of triode receives the second control signal, collector electrode is electrically connected with the second receiving terminal.
Further scheme is, first signal output part is connected with RC filter circuit, RC filter circuit comprises the 3rd resistance and the first electric capacity, the first end of the 3rd resistance is electrically connected with the first signal output part, the first end ground connection of the first electric capacity, second end of the 3rd resistance and the second end electrical connection of the first electric capacity, the second end of the 3rd resistance is connected electrically between the first resistance and the second resistance.
Therefore, controlled the base stage of triode by communication control circuit, make when measurement interface voltage, can by the second receiving terminal ground connection, thus the voltage accuracy improved on measurement first terminals, be also conducive to by RC filter circuit the acquisition precision improving Acquisition Circuit simultaneously.
Further scheme is, isolation power supply circuits comprise power supply chip, voltage stabilizing didoe, a LC filter circuit and the 2nd LC filter circuit, external power source is input to power supply chip through voltage stabilizing didoe and a LC filter circuit, and power supply chip is powered to optical coupling isolation circuit, communication control circuit, change-over circuit and digital voltage Acquisition Circuit through the 2nd LC filter circuit.
Further scheme is, one LC filter circuit comprises the first inductance and the second electric capacity, first end and the first end of the second electric capacity of the first inductance are electrically connected with the input anode of power supply chip, the first end of voltage stabilizing didoe is electrically connected with the second end of the first inductance, and the second end of voltage stabilizing didoe and the second end of the second electric capacity are electrically connected with the input cathode of power supply chip.
Further scheme is, 2nd LC filter circuit comprises the second inductance and the 3rd electric capacity, the first end of the second inductance is electrically connected with the output head anode of power supply chip, the first end of the 3rd electric capacity and the negative pole of output end ground connection of power supply chip, the second inductance second end and the 3rd electric capacity second end are electrically connected with the output port of power source of isolation power supply circuits.
Therefore, the voltage accuracy that isolation power supply circuits can improve measurement interface is effectively set.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the utility model telecommunication circuit embodiment.
Fig. 2 is the circuit diagram of isolating power supply circuits in the utility model telecommunication circuit embodiment.
Fig. 3 is the circuit diagram of RS485 interface in the utility model telecommunication circuit embodiment.
Fig. 4 is the circuit diagram of optical coupling isolation circuit in the utility model telecommunication circuit embodiment.
Fig. 5 is the circuit diagram of communication control circuit in the utility model telecommunication circuit embodiment.
Fig. 6 is the circuit diagram of RS232 change-over circuit in the utility model telecommunication circuit embodiment.
Fig. 7 is the circuit diagram of digital voltage Acquisition Circuit in the utility model telecommunication circuit embodiment.
Fig. 8 is the circuit diagram of level shifting circuit in the utility model telecommunication circuit embodiment.
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment
With reference to the system block diagram that Fig. 1, Fig. 1 are telecommunication circuit 1, ammeter 2.Ammeter 2 is provided with the RS485 interface 21 for data interaction.Telecommunication circuit 1 comprises optical coupling isolation circuit 11, digital voltage Acquisition Circuit 12, communication control circuit 13, isolation power supply circuits 14 and change-over circuit 15.Digital voltage Acquisition Circuit 12 and isolation power supply circuits 14 receive the signal exported by RS485 interface 21, and change-over circuit 15 is for receiving the signal of optical coupling isolation circuit 14 output and exporting echo signal to host computer 3.Communication control circuit 13 is for exporting the first control signal to optical coupling isolation circuit 14, and communication control circuit 13 is also for exporting the second control signal to digital voltage Acquisition Circuit 12, and communication control circuit 13 is also for host computer 3 output feedback signal.Digital voltage Acquisition Circuit exports collection signal to communication control circuit 13 after receiving the signal of RS485 interface 21 output.Power to digital voltage Acquisition Circuit 12, communication control circuit 13, optical coupling isolation circuit 14 and change-over circuit 15 after voltage regulation filtering after isolation power supply circuits 11 receive external power source.
With reference to the circuit diagram that Fig. 2, Fig. 2 are isolation power supply circuits 11.Isolation power supply circuits 11 comprise external power source interface J1, voltage stabilizing didoe D1, inductance L 1, inductance L 2, electric capacity C1, electric capacity C2 and DC power supply chip U1.
One LC filter circuit comprises inductance L 1 and electric capacity C1, the first end of inductance L 1 and the first end of electric capacity C1 are electrically connected with the input anode of DC power supply chip U1, the first end of voltage stabilizing didoe D1 is electrically connected with the second end of inductance L 1, and second end of voltage stabilizing didoe D1 and second end of electric capacity C1 are electrically connected with the input cathode of DC power supply chip U1.
2nd LC filter circuit comprises inductance L 2 and electric capacity C2, the first end of inductance L 2 is electrically connected with the output head anode of DC power supply chip U1, the first end of electric capacity C2 and the negative pole of output end ground connection of DC power supply chip U1, inductance L 2 second end and electric capacity C2 second end are electrically connected with the output port of power source VCC of isolation power supply circuits, and isolation power supply circuits are powered to the modules in telecommunication circuit by port VCC.External power source is input to DC power supply chip U1 through interface J1, voltage stabilizing didoe D1 and a LC filter circuit, and DC power supply chip U1 outwards powers through the 2nd LC filter circuit.
With reference to the circuit diagram that Fig. 3, Fig. 3 are RS485 interfaces.RS485 interface is outwards outputed signal by port TEST_A and port TEST_B.With reference to the circuit diagram that Fig. 4, Fig. 4 are optical coupling isolation circuits.Optical coupling isolation circuit comprises the first buffer circuit and the second buffer circuit, because the first isolation electricity is identical with the second buffer circuit structure, so be described by the first buffer circuit.First buffer circuit comprises the first photoelectrical coupler IOS1 and the second photoelectrical coupler IOS2, the emitter of the first photoelectrical coupler IOS1 is electrically connected with the collector electrode of the second photoelectrical coupler IOS2, and the emitter of the second photoelectrical coupler IOS2 is electrically connected with the collector electrode of the first photoelectrical coupler IOS1.The emitter of the first fiber coupler IOS1 receives and to be electrically connected with port TEST_A and to receive the signal that ammeter exports, and the emitter of the second fiber coupler IOS2 is electrically connected with port RS485_A and also outwards outputs signal.The emitter of the 3rd fiber coupler IOS3 of the second buffer circuit receives and to be electrically connected with port TEST_B and to receive the signal that ammeter exports, and the emitter of the 4th fiber coupler IOS4 is electrically connected with port RS485_B and also outwards outputs signal.
The first control signal that communication control circuit 13 exports comprises the first photoelectrical coupler control signal and the second photoelectrical coupler control signal, the negative electrode of the first photoelectrical coupler IOS1 and the negative electrode of the 3rd photoelectrical coupler IOS3 receive the first photoelectrical coupler control signal by port P1, and negative electrode and the 4th photoelectrical coupler IOS4 of the second photoelectrical coupler IOS2 receive the second photoelectrical coupler control signal by port P2.
With reference to the circuit diagram that Fig. 5, Fig. 5 are communication control circuits.Communication control circuit comprises singlechip chip U2 and clock circuit, singlechip chip U2 adopts model to be the single-chip microcomputer of STC12C5AC60S2, singlechip chip U2 arranges port P1 and the port P2 for exporting the first control signal at pin 35,36, singlechip chip U2 arranges the port P3 for exporting the second control signal at pin two 6, and singlechip chip U2 arranges the port TTL_T and port TTL_R that are used for output feedback signal at pin 6 and pin 8.Singlechip chip U2 arranges the port ADC for receiving collection signal at pin 44.
Clock circuit comprises crystal oscillator Y1, electric capacity C5 and electric capacity C6, the first end of crystal oscillator Y1 is electrically connected with the pin one 5 of the first end of electric capacity C5, singlechip chip U2, second end of crystal oscillator Y1 is electrically connected with the pin one 6 of the first end of electric capacity C6, singlechip chip U2, second end of electric capacity C5 and the second end ground connection of electric capacity C6.
Reference Fig. 6, Fig. 6 are RS232 change-over circuits.RS232 change-over circuit comprises interface chip U3, resistance R5, resistance R6, triode Q1.The interface chip of to be model the be MX485 that interface chip U3 adopts, the pin 6 of interface chip U3 is connected with port RS485_A, the pin 7 of interface chip U3 is connected with port RS485_B, the pin one of interface chip U3 is connected with port TTL_R and outwards exports the level signal after changing, and the pin 4 of interface chip U3 is connected with port TTL_T and outwards exports the level signal after changing.Resistance R5 has been connected in series between the base stage of triode Q1 and port TTL_T, resistance R6 has been connected in series between the collector electrode of triode Q1 and port VCC, the collector electrode of triode Q1 is electrically connected with the pin two of interface chip U3, pin 3, the grounded emitter of triode Q1.
With reference to the circuit diagram of Fig. 7, Fig. 7 digital voltage Acquisition Circuit.Digital voltage Acquisition Circuit comprises resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, electric capacity C7 and triode Q2, the first end of resistance R9 is electrically connected with port TEST_A and receives the signal that ammeter exports, second end of resistance R9 is electrically connected with the first end of the first end of resistance R10, resistance R11, the first end of electric capacity C7, second end of resistance R10 is electrically connected with port ADC and exports collection signal, the second end ground connection of electric capacity C7.The signal inputted by port TEST_A, after the RC filter circuit be made up of resistance R10 and electric capacity C7, outputs to singlechip chip U2 from port ADC.
Second end of resistance R11 is electrically connected with the collector electrode of triode Q2, the collector electrode of triode Q2 is also electrically connected with port TEST_B and receives the signal that ammeter exports, the grounded emitter of triode Q2, the base stage of triode Q2 is electrically connected with the first end of resistance R13, second end of resistance R13 and the first end of resistance R12, second end of resistance R13 is also electrically connected with port P3 and receives the second control signal, and second end of resistance R12 is electrically connected with port VCC.
With reference to the circuit diagram that Fig. 8, Fig. 8 are level shifting circuits.Level shifting circuit comprises level transferring chip U4 and interface J3, level transferring chip U4 adopt signal to be the chip of MAX232.Level transferring chip U4 is electrically connected with port TTL_T and port TTL_R and Received signal strength respectively by pin 9 and pin one 0.Level transferring chip U4 is electrically connected with interface J3 by pin 7 and pin 8, and to be electrically connected with host computer or faraway terminals computer by interface J3 and to carry out data interaction.
Communicating circuit 1 is when carrying out voltage acquisition to RS485 interface, communication control circuit 13 is by control port P1 and port P2, port TEST_A in optical coupling isolation circuit 14 and port RS485_A is blocked, and port TEST_B and port RS485_B is blocked, the signal ground that port TEST_B is inputted by control port P3 by simultaneous communications control circuit 13.Then the signal inputted from port TEST_A is input to communication control circuit 13 through port ADC and processes, if the magnitude of voltage of port TEST_A is lower than preset value, then can judge that RS485 interface 21 breaks down, communication control circuit 13 exports the feedback signal with fault message to host computer 3 by port TTL_T and port TTL_R subsequently.
Communicating circuit 1 is when carrying out signal of communication conversion to RS485 interface, RS232 place is outputted to after being processed by the signal that RS485 exports by control port P1 and P2, output to host computer 3 after change-over circuit 15 again by being made up of RS232 change-over circuit and level shifting circuit processes, host computer receives the signal with ammeter information can complete automatic data logging.
Therefore, the external signal exported by RS485 interface is received by digital voltage Acquisition Circuit, in order to improve acquisition precision, ensure the accuracy of its voltage measurement, optical coupling isolation circuit and digital voltage Acquisition Circuit is controlled by communication control circuit, namely control optical coupling isolation circuit to block, change-over circuit is made not affect the sampling of digital voltage Acquisition Circuit, a receiving terminal ground connection of control figure voltage collection circuit simultaneously, the voltage signal eventually passing the collection of digital voltage Acquisition Circuit is sent to after communication control circuit processes, exportable host computer or remote terminal computer etc. carry out Real-Time Monitoring, thus realize the interface fault automatically detecting RS485, after ammeter communication interface fault can be learnt timely, maintenance personal is arranged to repair it in time, timely reply communication is normal to be used.
Claims (8)
1. detect a telecommunication circuit for RS485 interface voltage, comprise
Optical coupling isolation circuit, for receiving external signal;
Change-over circuit, the signal exported for receiving described optical coupling isolation circuit also outwards exports echo signal;
It is characterized in that:
Described telecommunication circuit comprises communication control circuit, digital voltage Acquisition Circuit and isolation power supply circuits, described communication control circuit is used for exporting the first control signal to described optical coupling isolation circuit and exporting the second control signal to described digital voltage Acquisition Circuit, described digital voltage Acquisition Circuit is for receiving described external signal and exporting collection signal to described communication control circuit, and described isolation power supply circuits are used for powering to described optical coupling isolation circuit, described communication control circuit, described change-over circuit and described digital voltage Acquisition Circuit.
2. telecommunication circuit according to claim 1, is characterized in that:
Described optical coupling isolation circuit comprises the first photoelectrical coupler and the second photoelectrical coupler, the emitter of described first photoelectrical coupler is electrically connected with the collector electrode of described second photoelectrical coupler, the emitter of described second photoelectrical coupler is electrically connected with the collector electrode of described first photoelectrical coupler, the emitter of described first fiber coupler receives described external signal, and the emitter of described second fiber coupler outputs signal to described change-over circuit.
3. telecommunication circuit according to claim 2, is characterized in that:
Described first control signal comprises the first photoelectrical coupler control signal and the second photoelectrical coupler control signal, the negative electrode of described first photoelectrical coupler receives described first photoelectrical coupler control signal, and the negative electrode of described second photoelectrical coupler receives described second photoelectrical coupler control signal.
4. telecommunication circuit according to claim 1, is characterized in that:
Described external signal comprises the first external signal and the second external signal;
Described digital voltage Acquisition Circuit comprises the first receiving terminal, the second receiving terminal, the first resistance, the second resistance, triode and the first signal output part, described first receiving terminal is for receiving described first external signal, described second receiving terminal is for receiving described second external signal, described first resistance and described second resistant series between described first receiving terminal and described second receiving terminal, and described first signal output part is connected electrically between described first resistance and described second resistance;
The grounded emitter of described triode, the base stage of described triode receives described second control signal, and described collector electrode is electrically connected with described second receiving terminal.
5. telecommunication circuit according to claim 4, is characterized in that:
Described first signal output part is connected with RC filter circuit, described RC filter circuit comprises the 3rd resistance and the first electric capacity, the first end of described 3rd resistance is electrically connected with described first signal output part, the first end ground connection of described first electric capacity, second end of described 3rd resistance and the second end electrical connection of described first electric capacity, the second end of described 3rd resistance is connected electrically between described first resistance and described second resistance.
6. telecommunication circuit according to claim 1, is characterized in that:
Described isolation power supply circuits comprise power supply chip, voltage stabilizing didoe, a LC filter circuit and the 2nd LC filter circuit, external power source is input to described power supply chip through described voltage stabilizing didoe and a LC filter circuit, and described power supply chip is powered to described optical coupling isolation circuit, described communication control circuit, described change-over circuit and described digital voltage Acquisition Circuit through described 2nd LC filter circuit.
7. telecommunication circuit according to claim 6, is characterized in that:
A described LC filter circuit comprises the first inductance and the second electric capacity, the first end of described first inductance and the first end of described second electric capacity are electrically connected with the input anode of described power supply chip, the first end of described voltage stabilizing didoe is electrically connected with the second end of described first inductance, and the second end of described voltage stabilizing didoe and the second end of described second electric capacity are electrically connected with the input cathode of described power supply chip.
8. telecommunication circuit according to claim 7, is characterized in that:
Described 2nd LC filter circuit comprises the second inductance and the 3rd electric capacity, the first end of described second inductance is electrically connected with the output head anode of described power supply chip, the described first end of the 3rd electric capacity and the negative pole of output end ground connection of described power supply chip, described second inductance second end and described 3rd electric capacity second end are electrically connected with the output port of power source of described isolation power supply circuits.
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| CN201420741961.3U CN204244219U (en) | 2014-12-02 | 2014-12-02 | A kind of telecommunication circuit detecting RS485 interface voltage |
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| CN201420741961.3U CN204244219U (en) | 2014-12-02 | 2014-12-02 | A kind of telecommunication circuit detecting RS485 interface voltage |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104778771A (en) * | 2015-04-10 | 2015-07-15 | 深圳市亿自达科技有限公司 | Wireless access control host |
| CN104778770A (en) * | 2015-04-10 | 2015-07-15 | 深圳市亿自达科技有限公司 | Access-control host |
| CN107069953A (en) * | 2017-02-27 | 2017-08-18 | 上海华宿电气股份有限公司 | A kind of monitoring system based on power bus information |
| CN109358308A (en) * | 2018-11-27 | 2019-02-19 | 杭州西力智能科技股份有限公司 | A kind of multichannel quickly detects the intellegent sampling equipment of RS485 port voltage |
| CN112034324A (en) * | 2020-06-23 | 2020-12-04 | 贵州电网有限责任公司 | Method and device for detecting driving capability of RS485 circuit |
| CN112294424A (en) * | 2019-07-30 | 2021-02-02 | 上海睿刀医疗科技有限公司 | Electric pulse device for treating tumors |
| CN113093018A (en) * | 2021-03-09 | 2021-07-09 | 北京交通大学 | Lithium ion battery instantaneous internal short circuit detection device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104778771A (en) * | 2015-04-10 | 2015-07-15 | 深圳市亿自达科技有限公司 | Wireless access control host |
| CN104778770A (en) * | 2015-04-10 | 2015-07-15 | 深圳市亿自达科技有限公司 | Access-control host |
| CN107069953A (en) * | 2017-02-27 | 2017-08-18 | 上海华宿电气股份有限公司 | A kind of monitoring system based on power bus information |
| CN107069953B (en) * | 2017-02-27 | 2024-05-03 | 上海华宿电气股份有限公司 | Monitoring system based on power bus information |
| CN109358308A (en) * | 2018-11-27 | 2019-02-19 | 杭州西力智能科技股份有限公司 | A kind of multichannel quickly detects the intellegent sampling equipment of RS485 port voltage |
| CN112294424A (en) * | 2019-07-30 | 2021-02-02 | 上海睿刀医疗科技有限公司 | Electric pulse device for treating tumors |
| CN112034324A (en) * | 2020-06-23 | 2020-12-04 | 贵州电网有限责任公司 | Method and device for detecting driving capability of RS485 circuit |
| CN113093018A (en) * | 2021-03-09 | 2021-07-09 | 北京交通大学 | Lithium ion battery instantaneous internal short circuit detection device and method |
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