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The Study on Simulation System of Serial Bus Port

Author: LiYuMing
Tutor: WangDaoShun
School: Dalian Jiaotong University
Course: Mechanical and Electronic Engineering
Keywords: Serial Bus RS232 MODBUS protocol SPI
CLC: TP391.9
Type: Master's thesis
Year: 2008
Downloads: 248
Quote: 4
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Abstract


With the development of the PC and serial communication technology, many companies are using the RS232 serial port of a PC with a variety of external devices connected, the PC functions and equipment for data communications, monitoring or control operation. In actual production, in order not to affect the progress of the work, and often before the equipment purchase need to be developed with new equipment or devices, the connected devices, the communication connection if there is no support of the hardware it is difficult to implement debugging process then requires a serial communication simulation system to simulate the simulation of new equipment or devices, communications, simulation systems can simulate the communication status of new equipment or devices need to develop devices to connect and debug; There is another situation in two equipment or devices, serial communication failed, unable to determine where the error out, to debug simulation systems can communicate with each device or devices to identify the problem lie and solve the problem, so the serial communication simulation system for The connection between the communication device or devices and debugging of great significance. The main content of this article has two parts: a MODBUS protocol communication via RS485 serial communication software simulation system design in the the WINDOWS system with VISUAL BASIC 6.0, and two universal distribution, the focus of the software serial MODBUS protocol The design of the communication rules. Software sub-host and from the two parts of the machine, such simulation software communication equipment that can host can also be a slave, to meet the needs of the actual communication. Host's task is to send data and receive a response sent from the machine and make judgments about right and wrong; slave task data is sent by the receiving host, make judgments about right and wrong, and then the data sent is determined based on the data received and sends it back host. The software design is mainly used for communication between the test equipment. An SPI serial interface simulation system design, some of the major hardware-based, according to the characteristics of the serial interface, take full advantage of the characteristics of each pin, four pin analog SPI communication lines of communication connecting AD DA converter with SPI serial interface hardware. 10-bit AD converter TLC1549 and TLC2543 12-bit AD converter, for example, described in detail the design of the hardware and its TLC1549 software developed with VB. The design of the hardware and the main idea for communication between devices testing, by example can learn by analogy, teaching and so has a certain significance. RS485 serial communication test software design, RS232-485 converter module supports MODBUS serial communication protocol agreement with a certain Instruments Factory, a temperature control instrumentation, communications test, test results software can smoothly complete the communication, to meet the communication requirements.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Computer simulation
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