CN201340680Y - USB serial port communication experiment instrument - Google Patents
USB serial port communication experiment instrument Download PDFInfo
- Publication number
- CN201340680Y CN201340680Y CNU2008201195844U CN200820119584U CN201340680Y CN 201340680 Y CN201340680 Y CN 201340680Y CN U2008201195844 U CNU2008201195844 U CN U2008201195844U CN 200820119584 U CN200820119584 U CN 200820119584U CN 201340680 Y CN201340680 Y CN 201340680Y
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- China
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- experiment instrument
- usb
- data
- serial port
- usb bus
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- Expired - Fee Related
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- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model relates to a teaching experiment instrument, in particular to a USB serial port communication experiment instrument, which consists of a circuit board, and a single chip, a USB bus interface circuit, an LCD monitor, a keypad, a digital temperature sensor and an A/D transforming circuit which are arranged on the circuit board. The experiment instrument obtains the power directly from the USB bus without an external power source. The USB interface circuit transforms the USB bus to be a serial port to be connected with the single chip. The experiment instrument has an opened communication protocol, so that the experimenter can communicate with the experimental instrument by writing a host computer communication program according to the protocol. According to the order which is transmitted by the PC, the experiment instrument transmits the current key value, temperature, A/D transforming results or the data which is started according to the stipulated address in RAM to the PC, or the experiment instrument writes the data which is transmitted from the PC to the beginning area of the stipulated address of RAM. For the convenient observation, the experiment instrument can instantly display the orders or data information from the PC, and the data inside RAM of the experiment instrument can be viewed and edited through the keypad and the LCD monitor, so that the experiment result can be clearer and more direct, thereby being convenient for the experimenter to judge whether the data transmission is correct or not, and being useful for the experimenter to learn the serial port communication technology and to improve the programming skill.
Description
Technical field
The utility model relates to a kind of teaching and experiment equipment, particularly a kind of USB type serial-port communication experiment instrument.
Background technology
Serial communication has obtained using very widely in robotization control, data acquisition system (DAS), it is the important content of courses of specialties such as universities and colleges' computing machine, robotization, when relating to the design of host computer signal procedure, debugging in the teaching, the general method that adopts internal loopback, the application need that is difficult to artificial actual is debugged also very inconvenient.
Summary of the invention
The purpose of this utility model is exactly to provide an experimental provision that is connected with PC by USB interface to the experimenter.This device has open communication protocol, the experimenter is as long as write the host computer signal procedure according to this agreement, can communicate with experiment instrument, the order that experiment instrument is sent according to PC, the data block that assigned address among the RAM can be begun is uploaded to PC, or the data block that PC is passed down writes the zone that the RAM assigned address begins; For the ease of observing, LCD display can show order or the data message from PC in real time; Can browse, edit the data among the RAM on the experiment instrument by keyboard; Experiment instrument can be uploaded to PC with current key value, temperature or A/D transformation result in real time, makes experimental result clear more, directly perceived, and whether be convenient to the transmission of experimenter's judgment data correct.
This novel serial-port communication experiment instrument is made up of single-chip microcomputer, usb bus interface circuit, LCD display, keyboard, digital temperature sensor, A/D change-over circuit.The external RAM of embedded 1024 bytes of single-chip microcomputer, and have the in-system programming function, can upgrade the program in the experiment instrument easily; The usb bus interface circuit converts usb bus to serial port and links to each other with single-chip microcomputer, and the power supply that obtains simultaneously on the usb bus is powered to experiment instrument; By keyboard communication baud rate can be set, browse or edit the data in the external RAM, perhaps direct key assignments with institute's button sends PC to; Current temperature value or A/D transformation result can be sent to PC by temperature sensor and A/D change-over circuit, be convenient to the experiment that the experimenter finishes data acquisition.
Advantage of the present utility model is: can show data or order from PC in real time, also the key assignments of the data among the RAM, button, current temperature value or A/D transformation result can be sent to PC, make the debugging of host computer signal procedure become very convenient, directly perceived; Experiment instrument links to each other with PC by USB interface, finishes the serial communication experiment and no longer relies on traditional RS232 interface; Experiment instrument obtains the 5V power supply from usb bus, has saved external power supply, has reduced the cost of experiment instrument; Have the in-system programming function, can upgrade the program of experiment instrument easily, satisfy different application demands.
Description of drawings
Fig. 1 is a composition frame chart of the present utility model.
Embodiment
As shown in Figure 1, USB type serial-port communication experiment instrument is made up of single-chip microcomputer, usb bus interface circuit, digital temperature sensor, A/D change-over circuit, keyboard circuit, LCD display.The 5V power supply that experiment instrument directly adopts usb bus to provide; Single-chip microcomputer is selected the external RAM of embedded 1024 bytes, the STC89C58RD+ with in-system programming function for use, mixes crystal oscillating circuit and reset circuit, and crystal oscillator frequency is 11.0592MHz; The usb bus interface chip is selected CH341T for use, converts usb bus to serial port and links to each other with single-chip microcomputer, uses the configuration status of light emitting diode indication USB device; Digital temperature sensor is selected DS18B20 for use, and its data line links to each other with the I/O mouth line of single-chip microcomputer, and is connected with+5V power supply by resistance; 8 bits serial A/D conversion chip the TLC549 of SPI interface is selected in the A/D conversion for use; LCD display adopts character-type liquid crystal display module RT1602C, can show 2 row, 16 row characters; The determinant keyboard that 16 buttons are formed 4 row, 8 row links to each other with the I/O mouth line of single-chip microcomputer.
Claims (2)
1, a kind of USB type serial-port communication experiment instrument, comprise circuit board and be installed in single-chip microcomputer, usb bus interface circuit, LCD display, keyboard circuit, temperature sensor, A/D change-over circuit on the circuit board, it is characterized in that: experiment instrument is connected with PC by USB interface, and the usb bus interface circuit converts usb bus to serial port and links to each other with single-chip microcomputer.
2, USB type serial-port communication experiment instrument according to claim 1, it is characterized in that: single-chip microcomputer is STC89C58RD+, and it is CH341T that usb bus changes the serial ports control chip, and temperature sensor is DS18B20, the serial a/d converter is TLC549, and LCD MODULE is RT1602C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201195844U CN201340680Y (en) | 2008-10-16 | 2008-10-16 | USB serial port communication experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201195844U CN201340680Y (en) | 2008-10-16 | 2008-10-16 | USB serial port communication experiment instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201340680Y true CN201340680Y (en) | 2009-11-04 |
Family
ID=41236223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201195844U Expired - Fee Related CN201340680Y (en) | 2008-10-16 | 2008-10-16 | USB serial port communication experiment instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201340680Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542885A (en) * | 2010-12-31 | 2012-07-04 | 青岛海尔软件有限公司 | Embedded development platform-based bootloaer device |
-
2008
- 2008-10-16 CN CNU2008201195844U patent/CN201340680Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542885A (en) * | 2010-12-31 | 2012-07-04 | 青岛海尔软件有限公司 | Embedded development platform-based bootloaer device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20101016 |