CN211457129U - Portable electric power communication channel test terminal - Google Patents
Portable electric power communication channel test terminal Download PDFInfo
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- CN211457129U CN211457129U CN202020651402.9U CN202020651402U CN211457129U CN 211457129 U CN211457129 U CN 211457129U CN 202020651402 U CN202020651402 U CN 202020651402U CN 211457129 U CN211457129 U CN 211457129U
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Abstract
The utility model provides a portable electric power communication channel test terminal, include: the voltage measuring circuit comprises a voltage signal sampling circuit, an A/D conversion circuit, a single chip microcomputer and a display circuit, the single chip microcomputer processes input sampling signals, and finally, pin voltage values are displayed on the display circuit; the cable short-circuit test circuit realizes acousto-optic synchronous alarm when the short circuit is connected by combining the integrated operational amplifier chip and the peripheral circuit with a power supply, a buzzer and a light-emitting diode; and the loop detection circuit is used for transmitting a specific message to realize RS232 serial port signal test by setting different baud rates through the singlechip. The terminal is applied to RS232 regulation and control channels, telephone line testing troubleshooting and other works, so that workers can test the accuracy of message data receiving and sending of the regulation and control channels and whether the port voltage is normal or not, and meanwhile, the function of telephone line troubleshooting can be met.
Description
Technical Field
The utility model relates to a circuit communication detects relevant technical field, specifically is portable electric power communication channel test terminal.
Background
The power communication plays an important role in coordinating the joint operation of the components of power system such as transmission, transformation, distribution and power utilization, and ensuring the safe, economic, stable and reliable operation of the power grid, and effectively ensures the communication requirements of power production, capital construction, administration, flood prevention, dispatching, relay protection, safety automatic devices, telecontrol, computer communication, power grid dispatching automation and the like. The dispatching automation system is one of main service objects of power communication, ensures the safe and stable operation of the dispatching automation system is an important task of power communication, and is a key link for ensuring the safe and stable operation of the power system and smoothly carrying out production and operation.
The operation and maintenance of the conventional daily power communication system have the following problems: (1) the working efficiency of testing RS232 channels by using notebook computer serial port testing software is low-the data port wiring of audio distribution frames of various factories and stations is different, the testing of the regulation and control channels by using the notebook serial port testing software requires repeated attempts on the wiring sequence under the condition that the receiving, sending and ground wire sequences of the regulation and control channels are not determined, the serial port software enters 'dead cycle' in the attempt process and needs to be restarted, even the notebook serial port is damaged due to wiring errors, the channel testing process takes longer time and has low efficiency; (2) the RS232 channel is tested by using notebook computer serial port test software, which is inconvenient to operate by one person, the notebook computer software is often operated by one person, and the port is butted by one person when the situations that the notebook computer is difficult to place, the external power supply is difficult, the USB patch cord drive is damaged and the like in a messy field are frequently encountered when a transformer substation uses a notebook computer for testing; and (3) the conventional testing method needs a notebook computer and a digital multimeter, but only serial port testing software and a multimeter direct-current voltage measuring range (20V range) are used in the actual channel test, so that the instrument has low use efficiency and higher maintenance cost.
SUMMERY OF THE UTILITY MODEL
For solving the not enough of prior art, the utility model discloses combine prior art, set out from practical application, provide a portable power communication channel test terminal, be applied to works such as RS232 regulation and control passageway, telephone line test troubleshooting trouble, supply whether staff's test regulation and control passageway receiving and dispatching message data accuracy, port voltage are normal, can satisfy telephone line troubleshooting's function simultaneously.
The technical scheme of the utility model as follows:
portable electric power communication channel test terminal includes:
the voltage measuring circuit comprises a voltage signal sampling circuit, an A/D conversion circuit, a single chip microcomputer and a display circuit, the single chip microcomputer processes input sampling signals, and finally, pin voltage values are displayed on the display circuit;
the cable short-circuit test circuit realizes acousto-optic synchronous alarm when the short circuit is connected by combining the integrated operational amplifier chip and the peripheral circuit with a power supply, a buzzer and a light-emitting diode;
and the loop detection circuit is used for transmitting a specific message to realize RS232 serial port signal test by setting different baud rates through the singlechip.
In the voltage measuring circuit, a voltage signal sampling circuit is formed by an LM324 integrated operational amplifier and a 74HC4051 eight-selection analog switch, pin voltage can be accurately acquired, analog-to-digital conversion is carried out on the acquired signals, an analog-to-digital (ADC) 0808 chip is used in an A/D conversion circuit, and a 51 single chip microcomputer and an LCD1602 are used in a single chip microcomputer and a display circuit.
In the cable short-circuit test circuit, an integrated operational amplifier LM741 chip peripheral circuit is constructed, and a power supply, a buzzer and a light emitting diode are combined to realize acousto-optic synchronous alarm when a short circuit is connected.
In the loop detection circuit, the communication connection mode adopts a three-wire system method, namely an RXD pin, a TXD pin and a GND pin of a singlechip are respectively connected with a transmitting port, a receiving port and a ground three-wire on a distribution frame.
The test terminal further comprises a port detection circuit, and the port detection circuit realizes 3 port discrimination of the RS232 industrial serial port based on the voltage measurement function and the port function of the multimeter.
The utility model has the advantages that:
1. the utility model discloses a whether unobstructed based on the detection channel to and in time seek the importance of channel fault department, and combine the portable electric power communication channel test terminal of actual conditions design, this portable electric power communication channel test terminal is applied to works such as RS232 regulation and control passageway, telephone line test troubleshooting trouble, supplies whether staff's test regulation and control passageway receiving and dispatching message data accuracy, port voltage are normal, can satisfy the function of telephone line troubleshooting simultaneously.
2. The utility model discloses use the singlechip independently to test voice loop, avoided adopting the inconvenience that notebook field test brought and not enough.
3. The utility model discloses fuse each module that electric power system witnessed inspections in a little portable terminal, have very strong using value.
4. The equipment cost and the maintenance cost for detecting and dispatching the fault of the automatic system are reduced, the detection efficiency is improved, the labor is saved, and the more stable and safer operation of the power grid is guaranteed.
Drawings
FIG. 1 is a voltage measurement schematic;
FIG. 2 is a schematic diagram of a cable short circuit test;
FIG. 3 is a schematic diagram of loop detection;
FIG. 4 is a voltage measurement circuit diagram;
FIG. 5 is a circuit diagram for detecting short circuits;
FIG. 6 is a circuit diagram of a test loop.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.
As shown in fig. 1-6, it is the utility model discloses a portable electric power communication channel test terminal theory and circuit diagram that are relevant.
The test terminal has the following functions:
confirmation and path detection of RS232 pin:
and designing a power test system to realize the confirmation of the distribution frame data port by separating from a computer. The method can receive and display messages under common baud rates (9600, 1200 and 300) in hexadecimal; the method can send fixed hexadecimal messages and realize the 'self-sending and self-receiving' function of the tested channel in a loopback state.
Measurement of RS232 pin voltage:
the conventional testing method needs a notebook computer and a digital multimeter, but only 20V voltage range grade measured by serial port testing software and multimeter direct-current voltage is used in actual channel testing, so that the instrument is low in use efficiency and high in maintenance cost.
To address this problem, a device port voltage test module is designed. The voltage between the three lines of the receiving line, the transmitting line and the ground of the RS232 channel can be tested, the measuring range is 0-20V, the error value between a measured value and an actual value is not more than 0.5V, the tested voltage value is fed back to a user through display equipment, and the detection data can be obtained and recorded more accurately.
And (3) cable short circuit detection:
telephone lines are an important carrier for signal transmission or energy transmission in widespread use. Its testing is also of interest to the skilled person, compared to its extensive use. The electric power voice user side is divided into dispatching telephone users and administrative telephone users according to user attributes, two-wire simulation loops are used on a central machine room distribution frame and a user side distribution frame, and a universal meter is used for testing whether the loops are short-circuited or not when the on-off condition of the two-wire loops is tested.
The cable short-circuit detection module is used for testing whether a short circuit exists in a circuit through the positive electrode and the negative electrode which are externally connected with the test pen, and the short-circuit condition is judged in an acoustic-optical synchronous alarm mode.
The utility model discloses well functional module's design as follows:
the port detection circuit:
RS232 used by the power system is an industrial serial port and only uses three pins of RXD, TXD and GND. The three pins can be distinguished by detecting the voltage of the pins and judging the short circuit of the pins among the groups. Since the TXD pin is logic 1 when idle, i.e., the voltage is negative. Therefore, the serial TXD line of the tested device can measure the negative voltage. Through testing, TXD of two groups of serial ports is found. And testing short circuit of the two rest ports by using a universal meter, finding GND signals in the two serial ports if short circuit prompt appears, and obtaining the rest ports which are RXD ports.
The method is simple and intuitive, and the voltage measuring function and the short circuit function of the multimeter are designed, so that the 3 ports can be distinguished.
A voltage measurement circuit:
the voltage port testing function is also a necessary function in field maintenance, and is combined on one device, so that the convenience and the accuracy of maintenance work can be greatly improved, the fault of a communication system can be solved more quickly, and the stable operation of the power communication system is guaranteed.
As shown in fig. 1, the system voltage testing module includes a hardware circuit including four parts: the voltage signal sampling circuit, the A/D conversion circuit, the singlechip and the display circuit. The voltage acquisition circuit is formed by an LM324 integrated operational amplifier and a 74HC4051 eight-out-of-one analog switch, and can accurately acquire the pin voltage. And then, analog-to-digital conversion is carried out on the acquired signals, and an ADC0808 chip is used as an analog-to-digital conversion circuit, so that the requirement on the testing precision in work can be met. The singlechip and the real circuit use 51 singlechips and LCD 1602. The singlechip is programmed to realize calculation processing of the sent acquisition signals, and finally, the voltage value is displayed on the liquid crystal.
Cable short circuit test circuit:
the circuit short circuit and open circuit detection device is a basic functional module for power monitoring, a well designed detection circuit is manufactured, and the good detection device is a basic part of the design.
The short circuit test circuit is designed as shown in fig. 2, the module realizes acousto-optic synchronous alarm when short circuit is accessed by constructing a peripheral circuit of an integrated operational amplifier LM741 chip and combining a power supply, a buzzer and a light emitting diode, and the operation is convenient and the feedback is intuitive. The specific circuit design is shown in the figure. And when the resistance of the test meter pen connected with the signal is less than 10 ohms, the test meter pen is regarded as a short circuit, the buzzer gives out a sound prompt, and the LED and the like flicker. The 10 ohms can be changed according to specific requirements, and the adjustment can be realized only by changing the resistance value of the pull-down resistor at the non-inverting terminal of the amplifier.
A loop detection circuit:
the characteristic that the single chip microcomputer is provided with a full-duplex serial interface is utilized, and a serial port debugging program is used for testing RS-232 signals, so that 'self-sending and self-receiving' is completed in a loopback state of a channel to be tested.
The communication connection mode adopts a three-wire method. Namely, the RXD, TXD and GND pins of the single chip microcomputer are respectively connected with the transmitting port, the receiving port and the ground three lines on the distribution frame, as shown in fig. 3.
By programming the single chip microcomputer, the program sets different baud rates to send specific messages, and when the loopback state of the test channel is good, the self-sending and self-receiving functions can be realized, and the smoothness of the circuit is judged. According to the requirement, message information under 9600, 1200 and 300 baud rates is transmitted and received, a crystal oscillator of 12MHz is selected as the working frequency of the single chip microcomputer, and the required baud rate can be obtained through frequency division.
To the utility model discloses a test terminal has carried out actual simulation verification:
a port detection module:
each port can be determined one by the voltage during idle and working. A51 single chip microcomputer is used for constructing a digital voltmeter with the measuring range of 20V, and the single chip microcomputer is programmed. The system and the program are simulated by using Pruteus software, and the voltage value obtained after the sampling processing of the module is verified to be consistent with the result measured by directly using multimeter equipment at the signal input end, and the precision of the voltage value is far more satisfactory. The test circuit is shown in fig. 4.
LM324 is a quad-op-amp integrated circuit that includes four sets of identical form operational amplifiers therein. The circuit only needs 2 groups, a voltage comparator is formed by building a peripheral circuit, and an output signal of the operational amplifier is connected into 74HC4051 as an input signal.
74HC4051 eight-select-one analog switch, 6-pin INH is the active low input enable terminal, the clock is connected to GND and keeps low level, and 11, 10 and 9 are the built-in 3 address selection terminals. The pins 9 are grounded, only 11 and 10 are effective, the two control pins are connected with a port P2 of the single chip microcomputer, and a 4-out-of-one analog switch can be realized through programming. And connecting the output signal of the selector to an AD conversion chip for voltage conversion.
ADC0808 is an analog-to-digital conversion chip comprising an 8-bit A/D converter and 8-path multi-way switches, and an output signal at the front end is connected to an input end of the AD chip. The 3-bit address line A, B, C of the ADC0808 is grounded completely, only the first path of analog input IN0 is gated, the input signal IN0 is converted, and finally the conversion result is transmitted to the single chip from the 8-bit output port OUT1-OUT 8.
And processing the converted voltage data by programming the singlechip, and controlling 1602 the liquid crystal display to display the voltage value after analog-to-digital conversion.
Cable short circuit test circuit:
the simulation was performed under Multisim software, as shown in fig. 5. According to the simulation chart, when the resistance value of the access signal is approximately 0, the buzzer can emit sound frequency of 200HZ, and the LED is lightened. And sound and light synchronous alarm is realized.
The short circuit detection circuit is designed based on the principle of a voltage comparator, the voltage comparator is a circuit for identifying and comparing input signals, the function of the voltage comparator is to use the high or low level of output voltage to represent the magnitude relation of two input voltages, and when the voltage of a plus input end is higher than that of a minus input end, the output of the voltage comparator is high level; when the voltage at the "+" input terminal is lower than that at the "-" input terminal, the output of the voltage comparator is at low level. Here, the voltage divided by the resistors is connected across the LM741, the reference voltage (V +), V1R 3/(R1+ R3),
the comparison voltage (V-) ═ V1 × R4/(R2+ R4). From the function of the comparator, it can be seen that: when R4 is less than R3, the output end of LM741 is high level, drives the buzzer and the light emitting diode to work, and R4 is the circuit to be detected, thus realizing the short circuit detection circuit.
Loop detection test circuit:
the loop detection is realized by a 51-chip microcomputer. Two 51 singlechips respectively represent a test circuit and a distribution frame to be tested. The circuit was test verified using Proteus software, as shown in FIG. 6. The test circuit may be in loop communication with the circuit under test. The hexadecimal messages sent by the test are displayed through the nixie tube, and the content of the messages can be set through a P1.7 port of the test singlechip. The baud rate of communication can be set through a P1.0 port of the test singlechip.
The power communication test circuit is commonly used for 2 single-chip microcomputers 51, 3 integrated operational amplifiers, a nixie tube, a 1602 liquid crystal and other basic components, and the circuit system is small in size. The modules required by the field detection of the power system are integrated into a small portable terminal, and the battery is used for supplying power, so that the portable terminal is convenient to use, simple to operate and high in application value.
As shown in fig. 6, the transceiver ends of the two single chip microcomputer circuits are connected, that is, the RXD end of the No. 1 machine is connected with the TXD end of the No. 2 machine, and the TXD end of the No. 1 machine is connected with the RXD end of the No. 2 machine, so as to form a transceiver loop. The two testing singlechips are respectively connected with a nixie tube through P2 interfaces to display the transmitted or received 16-system message testing data. The P1.7 ports of the two singlechips are used for setting the message information to be sent. The port P1.0 of the number 1 machine is used for setting the baud rate of the transmitted message. The single chip microcomputer changes the working frequency by detecting the key information of the P1.0 port, so that the purpose of sending messages under different baud rates to test whether the serial port loop is normally received and sent is achieved. Pin 19 is a crystal oscillator circuit for providing a working clock for the singlechip, and pin 9 is a reset circuit.
Claims (5)
1. Portable electric power communication channel test terminal characterized in that includes:
the voltage measuring circuit comprises a voltage signal sampling circuit, an A/D conversion circuit, a single chip microcomputer and a display circuit, the single chip microcomputer processes input sampling signals, and finally, pin voltage values are displayed on the display circuit;
the cable short-circuit test circuit realizes acousto-optic synchronous alarm when the short circuit is connected by combining the integrated operational amplifier chip and the peripheral circuit with a power supply, a buzzer and a light-emitting diode;
and the loop detection circuit is used for transmitting a specific message to realize RS232 serial port signal test by setting different baud rates through the singlechip.
2. The portable power communication channel test terminal according to claim 1, wherein in the voltage measurement circuit, the voltage signal sampling circuit is formed by an LM324 integrated operational amplifier and an analog switch selected from eight 74HC4051, so that a pin voltage can be accurately obtained, and then analog-to-digital conversion is performed on the acquired signal, the a/D conversion circuit uses an ADC0808 chip, and the single chip microcomputer and the display circuit use a 51 single chip microcomputer and an LCD 1602.
3. The portable power communication channel test terminal as claimed in claim 1, wherein in the cable short-circuit test circuit, an audio-visual synchronous alarm is implemented by constructing a peripheral circuit integrated with an LM741 chip of the operational amplifier, and combining a power supply, a buzzer and a light emitting diode.
4. The portable power communication channel test terminal as claimed in claim 1, wherein in the loop detection circuit, the connection mode of communication adopts a three-wire method, i.e. three pins of RXD, TXD and GND of the single chip microcomputer are respectively connected with a transmitting port, a receiving port and three ground wires on the distribution frame.
5. The portable power communication channel test terminal of claim 1, further comprising a port detection circuit, wherein the port detection circuit realizes the discrimination of 3 ports of the RS232 industrial serial port based on the voltage measurement function and the port function of a multimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020651402.9U CN211457129U (en) | 2020-04-26 | 2020-04-26 | Portable electric power communication channel test terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020651402.9U CN211457129U (en) | 2020-04-26 | 2020-04-26 | Portable electric power communication channel test terminal |
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| Publication Number | Publication Date |
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| CN211457129U true CN211457129U (en) | 2020-09-08 |
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| CN202020651402.9U Expired - Fee Related CN211457129U (en) | 2020-04-26 | 2020-04-26 | Portable electric power communication channel test terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089116A (en) * | 2021-11-22 | 2022-02-25 | 京东方科技集团股份有限公司 | Cable fault detection device and line fault detection method |
-
2020
- 2020-04-26 CN CN202020651402.9U patent/CN211457129U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089116A (en) * | 2021-11-22 | 2022-02-25 | 京东方科技集团股份有限公司 | Cable fault detection device and line fault detection method |
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Granted publication date: 20200908 |