CN219737692U - RS485 chip test system - Google Patents
RS485 chip test system Download PDFInfo
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- CN219737692U CN219737692U CN202320558857.XU CN202320558857U CN219737692U CN 219737692 U CN219737692 U CN 219737692U CN 202320558857 U CN202320558857 U CN 202320558857U CN 219737692 U CN219737692 U CN 219737692U
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 239000013078 crystal Substances 0.000 claims description 11
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- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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Abstract
The utility model discloses an RS485 chip test system, which comprises a main control computer, a direct current power supply, a signal source and a universal meter, wherein the main control computer is connected with the direct current power supply and the signal source through a universal interface bus, the main control computer is also connected with the universal meter through a USB line, the main control computer is connected with a controller through a USB-to-232 serial converter, the voltage output of the direct current power supply and the signal output of the signal source are respectively connected with the controller, the signal output of the controller is connected with the universal meter, and the controller can fix a chip to be tested and test the chip according to the testAnd the signal output of the direct current power supply and the signal source is required to be switched, and the signal input of the universal meter is required to be switched. The utility model has the beneficial effects that the automatic test of main electrical parameters of the polar and nonpolar RS485 chip can be realized 。
Description
Technical Field
The utility model relates to the technical field of chip detection, in particular to an RS485 chip test system.
Background
The national electric network company defines parameters of the serial port communication protocol RS-485 chip in the component technical specification of the electric energy meter of the enterprise standard Q/GDW11179.11-2015, and therefore the electric energy meter enterprise is required to supply goods by using the RS-485 chip conforming to the enterprise standard of the national electric network company.
However, when testing different parameters of the RS-485 chip, the chip manufacturer needs to use different testing equipment, so that the complexity of parameter testing is increased, and the efficiency of the whole testing work is also influenced. Therefore, an enterprise needs a test system that can completely cover all of the RS-485 chip parameters.
Disclosure of Invention
The utility model aims to solve the problems, and designs an RS485 chip test system.
The technical scheme of the utility model for achieving the purpose is that the RS485 chip testing system comprises a main control computer, a direct current power supply, a signal source and a universal meter, wherein the main control computer is connected with the direct current power supply and the signal source through a universal interface bus, the main control computer is also connected with the universal meter through a USB line, the main control computer is connected with a controller through a USB-to-232 serial port converter, the voltage output of the direct current power supply and the signal output of the signal source are respectively connected with the controller, the signal output of the controller is connected with the universal meter, and the controller can fix a chip to be tested and switch the signal output of the direct current power supply and the signal source and the signal input of the universal meter according to testing requirements.
The controller comprises a CORTEX-M0 single chip microcomputer, a 10MHz standard crystal, a first sampling holder, a second sampling holder, a first set of multi-way switch, a second set of multi-way switch and a fixing clamp of a chip to be tested, wherein the CORTEX-M0 single chip microcomputer is connected with the USB-to-232 serial port converter through an RS232 port and realizes data interaction with a master control computer, the CORTEX-M0 single chip microcomputer is connected with the 10MHz standard crystal, the CORTEX-M0 single chip microcomputer is respectively connected with the first multi-way switch and the second multi-way switch, the first multi-way switch is connected with the fixing clamp and is connected with the chip to be tested, the second multi-way switch is respectively connected with the direct current power supply and the signal source, the second multi-way switch is respectively connected with the universal meter, the CORTEX-M0 single chip microcomputer is respectively connected with the first multi-way switch and the second multi-way switch through the first multi-way switch and the second multi-way switch, and the multi-way switch is also connected with the first multi-way switch and the second chip microcomputer through the first multi-way switch and the second chip microcomputer.
The first multiplexing switch and the second multiplexing switch are respectively composed of a plurality of relays.
The standard crystal is a 10MHz standard crystal.
Advantageous effects
The RS485 chip test system manufactured by the technical scheme of the utility model has the following advantages: the test system can completely measure all electric parameters of the RS-485 chip specified by the enterprise standard of the national power grid company, the whole test process is completed fully automatically, a test report is directly generated, and the voltage/current/time test units can be independently detected/traced.
Drawings
FIG. 1 is a system block diagram of an RS485 chip test system according to the utility model;
FIG. 2 is a schematic block diagram of a controller according to the present utility model;
FIG. 3 is a flowchart of the operation of an RS485 chip test system according to the utility model;
in the figure, 1, a main control computer; 2. a direct current power supply; 3. a signal source; 4. a multimeter; 5. a controller; 6. CORTEX-M0 singlechip; 7. standard crystals; 8. a first sampling holder; 9. a second sampling holder; 10. a multi-way switch I; 11. a second multi-way switch; 12. a fixing clamp for a chip to be tested; 13. RS232 port.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings, as shown in fig. 1 to 3;
the technical scheme is that the main control computer 1 is connected with the controller 5 through the USB-to-232 serial port converter, the voltage output of the direct current power supply and the signal output of the signal source are respectively connected with the controller, the signal output of the controller is connected with the universal meter, and the controller can fix the chip to be tested and switch the signal output of the direct current power supply and the signal source and the signal input of the universal meter according to the test requirement.
The technical scheme is characterized in that the controller comprises a CORTEX-M0 single chip microcomputer 6, a 10MHz standard crystal 7, a sampling holder I8, a sampling holder II 9, a set of multiplexing switch I10, a set of multiplexing switch II 11 and a fixing clamp 12 of the chip to be tested, the CORTEX-M0 single chip microcomputer is connected with a USB-to-232 serial port converter through an RS232 port 13 and realizes data interaction with a master control computer, the CORTEX-M0 single chip microcomputer is connected with the 10MHz standard crystal, the CORTEX-M0 single chip microcomputer is respectively connected with the multiplexing switch I and the multiplexing switch II, the multiplexing switch I is connected with the fixing clamp and is in butt joint with the chip to be tested, the multiplexing switch II is respectively connected with a direct current power supply and the multiplexing switch II, the universal meter is respectively in butt joint with the multiplexing switch I and the multiplexing switch II through the multiplexing switch II, the CORTEX-M0 single chip microcomputer is respectively connected with the multiplexing switch I and the multiplexing switch II through the sampling holder I and the multiplexing switch II, and the signal input of the universal meter is also connected with the multiplexing switch I and the sampling holder II.
The controller implements specific target control actions of the test procedure such that the external stimulus and the test are coupled together to the respective locations while the controller independently completes the test for an amount of time. Besides the functions, the controller also has abnormality protection and alarm functions and is used for identifying abnormal conditions such as short circuit, overvoltage and the like in the test process.
The system aims at static test processes of working current test, receiver output high-resistance leakage current test, receiver output short-circuit current test, receiver output voltage test, receiver input impedance test, driver differential output voltage test, driver common mode output voltage test, driver output short-circuit current test, failure protection function test, overvoltage protection function test and overcurrent protection function test, wherein the test processes are as follows: the controller controls the multi-way switch to make the chip in a corresponding working state, and switches the test point to be connected with corresponding terminals of external voltage, current source and universal meter, and the PC controls the voltage source, current source and universal meter to be in corresponding gear and measuring range to finish measurement.
The system aims at the test processes of a digital input voltage test, a receiver differential input threshold voltage test and a receiving sensitivity test, and comprises the following steps: the controller controls the multi-way switch to make the chip in a corresponding working state, and switches the test point to be connected with the external voltage, the signal generator and the corresponding terminal of the universal meter, and the PC controls the voltage source, the signal source and the universal meter to be in corresponding gears. The controller detects the corresponding pin output turnover of the chip and automatically triggers the two paths of sampling holders, the first path of sampling holders are switched to the measuring terminal, the PC is informed of sending an instruction, the PC firstly controls the universal meter to measure the output voltage of the first path of sampling holders, then the controller is informed of sending an instruction to switch to the second path of sampling holders, the controller receives the instruction to finish switching and feeds back the instruction to the PC, the PC controls the universal meter to finish voltage measurement of the second path of sampling holders, and the sampling holders are reset by the instruction controller to wait for the next measurement.
The system aims at the test process of the automatic polarity judgment and correction test and the polarity judgment time test, and comprises the following steps: the controller controls the multi-way switch to make the chip in a corresponding working state, and switches the test point to be connected with a corresponding terminal of an external voltage source, and the PC controls the voltage source to be in a corresponding gear. The controller controls the tested chip to turn over the corresponding pins, and measures the turning time with a timer (capturing mode) and feeds back the test data to the PC through the RS232 interface.
The test process of the system aiming at the communication rate and the bit error rate test is as follows: the controller controls the multi-way switch to make the chip in a corresponding working state, then the chip is tested by the communication error rate with the tested chip after passing through the interface chip by the serial communication interface of the controller, and after the test is finished, the controller feeds test data back to the PC by the RS232 interface.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions; moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus; without further limitation; the term "comprising" an element defined by the term "comprising" does not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
The above technical solution only represents the preferred technical solution of the present utility model, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present utility model, and the technical solution falls within the scope of the present utility model.
Claims (4)
1. The utility model provides a RS485 chip test system, includes main control computer (1), DC power supply (2), signal source (3), and universal meter (4), main control computer through general interface bus with DC power supply with the signal source is connected, main control computer still through the USB line with the universal meter is connected, its characterized in that, main control computer passes through USB to 232 serial port converter and is connected with controller (5), DC power supply's voltage output with the signal output of signal source connects respectively the controller, the signal output of controller connects the universal meter, the controller can fixed chip that awaits measuring and switch over DC power supply and signal source's signal output and the signal input of universal meter according to the test demand.
2. The RS485 chip testing system according to claim 1, wherein the controller comprises a core x-M0 single-chip microcomputer (6), a 10MHz standard crystal (7), a sample holder one (8), a sample holder two (9), a set of multi-way switch one (10), a set of multi-way switch two (11) and a fixture (12) of a chip to be tested, the core x-M0 single-chip microcomputer is connected with the USB-to-232 serial port converter through an RS232 port (13) and realizes data interaction with the master computer, the core x-M0 single-chip microcomputer is connected with the 10MHz standard crystal, the core x-M0 single-chip microcomputer is connected with the multi-way switch one and the multi-way switch two respectively, the multi-way switch one is connected with the fixture and is in butt joint with the chip to be tested, the multi-way switch two is connected with the direct current power supply and the signal source respectively, the multi-way switch two is connected with the multi-way switch one and the multi-way switch one is connected with the universal meter chip to be tested, and the multi-way switch one is connected with the core x 0 single-chip microcomputer through the multi-way switch one and the multi-way switch two and the multi-way switch one is connected with the multi-way switch 0 single-chip microcomputer.
3. The RS485 chip test system according to claim 2, wherein the first and second multiplexing switches are each composed of a plurality of relays.
4. The RS485 chip test system according to claim 2, wherein the standard crystal is a 10MHz standard crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320558857.XU CN219737692U (en) | 2023-03-21 | 2023-03-21 | RS485 chip test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320558857.XU CN219737692U (en) | 2023-03-21 | 2023-03-21 | RS485 chip test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219737692U true CN219737692U (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320558857.XU Active CN219737692U (en) | 2023-03-21 | 2023-03-21 | RS485 chip test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219737692U (en) |
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2023
- 2023-03-21 CN CN202320558857.XU patent/CN219737692U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240422 Address after: 102201 2nd Floor, Building 1, North Erpuzi Village, Huilongguan Town, Changping District, Beijing Patentee after: BEIJING BANNER ELECTRIC MANUFACTURING Corp. Country or region after: China Address before: 301907 Special Purpose Vehicle Industrial Park, Wuqing District, Tianjin City, east side of Panlongshan Road, south side of Lanhe Street Patentee before: Tianjin Bona Instrument Co.,Ltd. Country or region before: China |
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| TR01 | Transfer of patent right |