CN105629104A - Wireless isolation serial communication interface test system having voltage detection - Google Patents
Wireless isolation serial communication interface test system having voltage detection Download PDFInfo
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- CN105629104A CN105629104A CN201511000849.XA CN201511000849A CN105629104A CN 105629104 A CN105629104 A CN 105629104A CN 201511000849 A CN201511000849 A CN 201511000849A CN 105629104 A CN105629104 A CN 105629104A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention relates to a wireless isolation serial communication interface test system having voltage detection, and belongs to the technical field of an electrical communication interface test. The test system includes a data processing and displaying terminal, a test connector, and a wireless communication assembly connecting the data processing and displaying terminal and the test connector. The test connector is formed by a probe, a signal conditioning circuit, an AD sampling circuit, a local measuring algorithm, a serial port communication interface circuit, a anti-over-current driving circuit, a relay, and a data transceiver and test protocol. The over-voltage and over-current are avoided by employing the voltage detection. The wireless isolation realizes the separation of the test connector and terminals for signal detection and communication connection. The volume of the test connector decreases. The demand of the terminal electrical properties is reduced, and the on-site operation is convenient.
Description
Technical field
The present invention relates to a kind of wireless isolation serial communication interface test macro with voltage detecting, belong to electrical communication interface technical field of measurement and test.
Background technology
Electric test instrument is electric installation development and the indispensable device of related products production testing and on-site maintenance maintenance. Comprising a large amount of communication interface between electric installation assembly, the testing tool of electric installation communication interface is also extremely important. The serial communication interfaces such as CAN or 485 total line interfaces, because its signal wire quantity is few, only need two, so application in the electrical apparatus is very general, also become the important channel that apparatus function test checks. But it is each variant that equipment installs position, and Site Detection circuit often has the hidden danger in electric safety, to wirelessly acquisition of signal front end is separated with the terminal comprising test protocol, it is possible to simplify execute-in-place, also can reduce the electric property requirement to test terminal simultaneously. At Chinese invention patent " distributed power system quality of power supply multi-target analysis monitoring platform " (application number: in 201510177233.3), reporting a kind of monitoring platform by information acquisition system, cloud database and distributed electrical energy quality research and application System's composition, its system architecture figure is as shown in Figure 1. Information acquisition system in this monitoring platform just have employed the wireless communication technology based on bluetooth communication. Radio communication is formed acquisition of signal front end by voltage reduction module, AD conversion module, micro-chip sampling module and is achieved electrical isolation for processing the mobile terminal of data further, and this kind of mode is also convenient to the selection operation that user carries out test function by mobile terminal. But prior art report is only used for the measurement to power network signal, it is not applied to the test of electrical communication interface. Current existing electrical communication interface test system; because not adopting effective voltage detecting and electrical isolation measure; often because the short circuit of communication link or device interior fault, the over-voltage and over-current of testing apparatus and terminal thereof can be caused, causes the damage of testing apparatus to scrap. Meanwhile, not adopting the testing apparatus of wireless isolation, i.e. the equipment of acquisition of signal front end and terminal one, if display terminal screen is relatively big, then onsite application is portable not, if display terminal screen is less, and inconvenience observation again.
Summary of the invention
It is an object of the invention to the deficiency for existing electrical communication interface test system, wish by adopting voltage detecting, avoid testing apparatus over-voltage and over-current, realize being used for acquisition of signal and the test connector of communication connection and being separated of terminal by wireless isolation simultaneously, reduce the volume of test connector, reduce the requirement to terminal electric property, it is convenient to execute-in-place.
A wireless isolation serial communication interface test macro with voltage detecting, comprising: data processing and display terminal, test connector and the wireless communication components the two being connected, wherein, test connector by popping one's head in, signal conditioning circuit, AD sample circuit, local measurement algorithm, serial communication interface circuit, anti-overflow driving circuit, rly. and data transmit-receive and test protocol form, probe in order to connect tested serial ports, and and then and signal conditioning circuit, AD sample circuit, local measurement algorithm and data transmit-receive and test protocol connect successively, Data Control and transmission agreement determine the sample frequency of AD sample circuit by sampling clock control, local measurement algorithm comprises the protecting control algorithm of serial port power pressure condition, when data processing and display terminal start serial communication test by the transmitting-receiving of wireless communication components control data and test protocol, the serial port power pressure condition that first data transmit-receive and test protocol obtain according to protecting control algorithm, and according to serial port power pressure condition relay and the test process that communicates, if serial port power pressure condition is abnormal, then not closing relay, serial communication end of test, if serial port power pressure condition is normal, then closing relay, data processing and display terminal start serial communication test process, by by wireless communication components, data transmit-receive and test protocol, serial communication interface circuit, anti-overflow driving circuit, rly., the communication passage of probe composition, communications test data is sent to tested serial ports, and receive and test returns data, in communication test process, if the serial port power pressure condition that protecting control algorithm obtains occurs abnormal, then disconnect rly., serial communication end of test.
Further, described wireless communication components is made up of infrared light receiving/transmitting device, infrared driver circuit, communication modulation and detuner and communication protocol.
Further, described wireless communication components is made up of antenna, RF driver circuit, communication modulation and detuner and communication protocol.
Further, described local measurement algorithm comprises the direct current algorithm of measuring sonde both end voltage average, is surveyed DC data and is passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
Further, described local measurement algorithm comprises the exchange algorithm of measuring sonde both end voltage virtual value, is surveyed exchange data and is passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
Further, described local measurement algorithm comprises the triggering sampling processing of record probe both end voltage sample waveform, is surveyed sampling data and is passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
Further, described protecting control algorithm, according to the threshold range detection probe both end voltage sampled value of setting, when both end voltage sampled value of popping one's head in exceeds this threshold range, then judges that serial port power pressure condition is abnormal, otherwise judges that serial port power pressure condition is normal.
Further, when described anti-overflow driving circuit detection probe flows through electric current, when electric current exceedes setting threshold value, then judge that overcurrent occurs, and disconnect rly., serial communication end of test by data transmit-receive and test protocol part.
The usefulness of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention is: by the voltage detecting function being made up of probe, signal conditioning circuit, AD sample circuit, local measurement algorithm; realize the Real-Time Monitoring to serial port power pressure condition; and then utilize protecting control algorithm testing apparatus to be protected, avoid communication interface and directly access generation electrical accident. Meanwhile, in communication test process, testing apparatus all will be realized protection in real time by voltage detecting and anti-overflow driving circuit. It is connected by wireless communication components between data processing and display terminal with test connector so that test connector structure simplifies, and reduces volume. Meanwhile, this also avoids data processing and display terminal and had electrical connection by measurement equipment, directly there is electrical accident in the terminal part preventing cost higher, thus also reduces the requirement to terminal electrical specification. Terminal is separated with test connector, is also convenient to the wiring of test connector, is convenient to adopt large-size screen monitors terminal to observe, brings facility to execute-in-place.
Accompanying drawing explanation
Fig. 1 is the system composition structure iron of existing distributed power system quality of power supply multi-target analysis monitoring platform.
Fig. 2 is the composition structure iron of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Fig. 3 is the circuit structure diagram of the signal conditioning circuit of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
The signal that Fig. 4 is a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention follows schematic circuit.
Fig. 5 is the level shift circuit figure of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Fig. 6 is the second-order filter circuit figure of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Fig. 7 is the realizing circuit figure of the AD sample circuit of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Fig. 8 is the protecting control algorithm flow figure of the serial port power pressure condition of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Fig. 9 is the anti-overflow driving circuit figure of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Figure 10 is the rly. driving circuit figure of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Figure 11 is the byte transmission sequence chart of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Figure 12 is the frame format figure of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Figure 13 be a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention based on infrared isolated data receive and dispatch circuit block diagram.
Figure 14 is the transmitting-receiving circuit block diagram of the isolated data based on bluetooth of a kind of wireless isolation serial communication interface test macro with voltage detecting of the present invention.
Embodiment
The wireless isolation electric energy table that the present invention has a voltage detecting forms structure as shown in Figure 2 by a specific embodiment of polarity 485 serial communication interface test macro. The wireless communication components that this embodiment comprises data processing and display terminal, test connector and the two is connected. Wherein, test connector by popping one's head in, signal conditioning circuit, AD sample circuit, local measurement algorithm, serial communication interface circuit, anti-overflow driving circuit, rly. and data transmit-receive and test protocol form. Tested serial ports is connected by probe, and connects successively with signal conditioning circuit, AD sample circuit, local measurement algorithm part and data transmit-receive and test protocol part. Data Control and transmission agreement determine the sample frequency of AD sample circuit by sampling clock control. Local measurement algorithm comprises the protecting control algorithm of serial port power pressure condition. When data processing and display terminal start serial communication test by the transmitting-receiving of wireless communication components control data and test protocol; the serial port power pressure condition that first data transmit-receive and test protocol obtain according to protecting control algorithm; and according to serial port power pressure condition relay and the test process that communicates; if serial port power pressure condition is abnormal; then not closing relay, serial communication end of test. If serial port power pressure condition is normal, then data transmit-receive and test protocol closing relay, start serial communication test process, by the passage that communicates being made up of with test protocol, serial communication interface circuit, anti-overflow driving circuit, rly., probe wireless communication components, data transmit-receive, to tested serial ports send communications test data, and receive and test returns data. In communication test process, if the serial port power pressure condition that protecting control algorithm obtains occurs abnormal, then disconnect rly., serial communication end of test.
The circuit structure diagram of the signal conditioning circuit of present example, as shown in Figure 3. The voltage signal obtained from probe follows circuit, skew circuit, filtering and protection circuit through signal attenuation circuit, signal, is then input to AD sample circuit. AD sample circuit adopts the inner A/D converter circuit carried of microprocessor chip STM32F207. Owing to the signal input range of this AD sample circuit is the voltage of 0V ~ 2.5V, so needing to input the AD sample port of STM32F207 after being changed by the voltage signal of input at Front-end Design level conversion conditioning circuit. The analog signals conversion conditioning schematic circuit diagram of present example, as shown in Figure 4, Figure 5 and Figure 6, wherein Fig. 4 is that signal follows circuit, and Fig. 5 is level shift circuit, and Fig. 6 is second-order filter circuit.
The signal of present example follows schematic circuit, as shown in Figure 4, the voltage follow device that first the voltage signal of probe input is made up of U6 through one carries out voltage buffering and isolation, U6 is the difference operational amplifier TL084 of a bipolarity, there is stable open-loop gain, and extremely low temperature drift and bias current, reduce the loss of input signal, to improve input resistance.
The level shift circuit figure of present example, as shown in Figure 5, signal follows the level shift circuit that the output signal AS_OUT of circuit consists of U10A and R25, R26, R27, R33, after superposition magnitude of voltage equaling reference voltage V ref, obtains voltage signal AD_IN.
The second-order filter circuit figure of present example; as shown in Figure 6; the second-order low-pass filter circuit that the output signal AD_IN of level shift circuit is made up of U10B by one; eventually pass twin diode protection clamping circuit; obtain voltage signal ADC; deliver to data gathering port ADIN0 or ADIN1, the effect of electric capacity C7 be filtering other pulse jamming and signal spine, ensure signal quality. Wherein U10A and U10B is TL084 operational amplifier. This second-order low-pass filter is in order to the signal disturbing outside filtering care frequency band.
The realizing circuit figure of the AD sample circuit of present example, as shown in Figure 7, image data ADC is transferred to STM32F207 master control module by AD sample circuit, and main function is that the analog signals gathered is carried out AD conversion and data processing.
The local measurement algorithm realized by STM32F207 program carries out signal measurement and process according to the discrete sample signals after AD conversion, comprising: direct current algorithm, exchange algorithm and triggering sampling processing. After digital filtering is placed on AD conversion, before data processing and sequence of control. The ultimate principle of digital filtering is: setting FIR filter length as M, so often sampling should be carried out, just sampled value is stored, in sampling time according to setting, often sampling should be carried out, gets current value and front (M-1) individual sampled value, carry out combinatorial operation, obtain a filtering output value. Direct current algorithm adopts the discrete sample signals sum-average arithmetic to N1 point to calculate, and obtains signal maximum voltage value and minimum amount of voltage that by comparing simultaneously; Exchange algorithm to the discrete sample signals of N2 point, through square, N2 point on average, evolution acquisition again; Triggering sampling processing can have set triggering condition of sampling, and preserves the discrete sample signals triggering front N3 point and triggering rear N4; Wherein, N1, N2, N3 all can be arranged.
The protecting control algorithm flow figure of the serial port power pressure condition of present example, as shown in Figure 8. According to different serial communication modes, read corresponding threshold range, do to differ from by itself and the data gathered and take absolute value. For RS485 communication, threshold range U1:0V ~ 6V, if U2��6.6V, �� be U��10%*6V=0.6V, serial port power pressure condition is normal, then closing relay, serial communication test starting; If U2 >=6.6V, �� be U >=10%*6V=0.6V, serial port power pressure condition is abnormal, then not closing relay, serial communication end of test.
The anti-overflow Drive Protecting Circuit of present example, as shown in Figure 9, connects overcurrent protective PT1 thermistor in circuit; when circuit is in standard state, the electric current flowing through PT1 is less than rated current, and PT1 is in normality; resistance is very little, can not affect the normal operation of protection circuit. When circuit electric current exceedes rated current, PT1 suddenly generates heat, and resistance sharply increases to high resistance state, thus restriction or blocking-up electric current, protection circuit is not damaged. Electric current recovers after normally, and PT1 also automatically returns to low resistance state, and circuit recovers normal operation.
The rly. driving circuit of present example, as shown in Figure 10, after protection signal is come, contact disconnects, and stops work.
Data transmit-receive and test protocol adopt DL/T645-1997 to communicate stipulations, these communication stipulations are applicable in local system multifunctional electric energy meter apparatus and handheld unit or other data terminal equipment carry out data exchange ways that is point-to-point or one master and multiple slaves, define the physical connection between them, communication link and utilisation technology specification. The master data form of these communication stipulations is: every byte, containing 8 binary codes, adds a start bit (0), an even parity bit and stop bit (1) totally 11, as shown in figure 11 during transmission. D0 is the least significant bit of byte, and D7 is the highest significant position of byte. First pass low position, pass a high position afterwards. The frame format of these communication stipulations is as shown in figure 12. Every frame accords with 7 territories by start-of-frame, tributary address territory, control code, data field length, data field, the longitudinal check code of frame information and frame end and forms. Every part is made up of some bytes.
The wireless communication components functional block diagram of present example, as shown in Figure 13, Figure 14. These circuit adopt infrared, bluetooth approach respectively. The wireless communication components signal that is used for avoiding communicating in test process is directly coupled, thus avoids terminal and directly connect tested communication interface, avoids because electrically coupling fault causes terminal to be damaged.
Data processing can start RS485 by the transmitting-receiving of wireless module control data and test protocol with display terminal and communicate test, data transmit-receive and test protocol first according to protecting control algorithm acquisition RS485 voltage state; According to RS485 voltage mode control rly. and the test process that communicates, if RS485 voltage abnormal state, then not closing relay, RS485 communicates end of test; If RS485 voltage state is normal, then closing relay, RS485 communicates test starting. The touch-screen of data processing and display terminal in test process also by detecting informations such as output display 485 port maximum voltage value, minimum amount of voltage that, communication messages.
Claims (8)
1. one kind has the wireless isolation serial communication interface test macro of voltage detecting, it is characterised in that, comprising: data processing and display terminal, test connector and the wireless communication components that the two is connected; Wherein, test connector by popping one's head in, signal conditioning circuit, AD sample circuit, local measurement algorithm, serial communication interface circuit, anti-overflow driving circuit, rly. and data transmit-receive and test protocol form; Probe in order to connect tested serial ports, and and then and signal conditioning circuit, AD sample circuit, local measurement algorithm and data transmit-receive and test protocol connect successively; Data Control and transmission agreement determine the sample frequency of AD sample circuit by sampling clock control; Local measurement algorithm comprises the protecting control algorithm of serial port power pressure condition, when data processing and display terminal start serial communication test by the transmitting-receiving of wireless communication components control data and test protocol, the serial port power pressure condition that first data transmit-receive and test protocol obtain according to protecting control algorithm, and according to serial port power pressure condition relay and the test process that communicates; If serial port power pressure condition is abnormal, then not closing relay, serial communication end of test; If serial port power pressure condition is normal, then closing relay, data processing and display terminal start serial communication test process, by the passage that communicates being made up of with test protocol, serial communication interface circuit, anti-overflow driving circuit, rly., probe wireless communication components, data transmit-receive, to tested serial ports send communications test data, and receive and test returns data; In communication test process, if the serial port power pressure condition that protecting control algorithm obtains occurs abnormal, then disconnect rly., serial communication end of test.
2. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterised in that: described wireless communication components is made up of infrared light receiving/transmitting device, infrared driver circuit, communication modulation and detuner and communication protocol.
3. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterised in that: described wireless communication components is made up of antenna, RF driver circuit, communication modulation and detuner and communication protocol.
4. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterized in that: described local measurement algorithm comprises the direct current algorithm of measuring sonde both end voltage average, surveyed DC data and be passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
5. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterized in that: described local measurement algorithm comprises the exchange algorithm of measuring sonde both end voltage virtual value, surveyed exchange data and be passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
6. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterized in that: described local measurement algorithm comprises the triggering sampling processing of record probe both end voltage sample waveform, surveyed sampling data and be passed to data processing and display terminal by data transmit-receive and test protocol part, wireless communication components.
7. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1; it is characterized in that: described protecting control algorithm is according to the threshold range detection probe both end voltage sampled value of setting; when both end voltage sampled value of popping one's head in exceeds this threshold range; then judge that serial port power pressure condition is abnormal, otherwise judge that serial port power pressure condition is normal.
8. a kind of wireless isolation serial communication interface test macro with voltage detecting according to claim 1, it is characterized in that: when described anti-overflow driving circuit detection probe flows through electric current, when electric current exceedes setting threshold value, then judge that overcurrent occurs, and disconnect rly., serial communication end of test by data transmit-receive and test protocol part.
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