论文中英文翻译(原文)
冬季男装搭配-
编号：
桂林电子科技大学信息科技学院
毕业设计
(
论文
)
外文翻译
（原文）
系
别：
电子工程系
专
业：
电子信息工程
学生姓名：
韦
骏
学
号：
指导教师单位：
桂林电子科技大学信息科技学院
姓
名：
梁
勇
职
称：
讲
师
2012
年
6
月
5
日
Design and implementation of the
agreement based on embedded system Modbus Linux
Abstract: with the embedded
with the rapid development of computer technology,
a new generation of
industrial
automation data acquisition and monitoring system,
adopting the core of high performance
embedded microcontroller processor, the
system well adapt to the application. It is in
line with strict
requirements of
consumption and other functions, such as
reliability, the cost, size and power consumption,
etc. In the industrial automation
application system, Modbus communication protocol
industrial standard,
widely applied in
large scale industrial equipment system, including
DCS, PLC, RTU and intelligent
instruments, etc. In order to achieve
embedded data monitoring of industrial automation
software
application needs, this paper
designed the embedded data acquisition monitoring
the workbench Modbus
agreement based on
the Linux environment collection system. The
serial port is to realize the
master/Modbus agreement from type,
including two kind of communication mode: ASCII
and RTU.
Therefore, all kinds of
ointment agreement can meet the Modbus equipment
serial communication. In the
embedded
platform Modbus agreement steady and reliable. It
in embedded data monitoring automation of
the application system of new
acquisitions prospect. Keywords: embedded system,
embedded Linux,
Modbus agreement, data
acquisition and monitoring and control.
1, the introduction
Modbus
is a communication protocol, is a company by
MoDiKang promotion. It is widely used in
industrial automation, has become a
real industry standard. The control device or
different manufacturer
measuring
instrument can link to an industry monitoring
network use Modbus agreement. Modbus
communication protocol can serve as a
lot of industrial equipment communication
standards, including
PLC, DCS system,
RTU, intelligent intelligent instrument. Embedded
with the rapid development of
computer
technology, embedded data acquisition monitoring
system, using the embedded
high-
performance microprocessors as the core, is an
important development direction. In the
environment
of Linux embedded in view
of the application of the embedded industrial
automation data, a Modbus Lord
agreement collection monitoring system
design and the realization of the document.
Therefore,
communication equipment,
various ointment agreement can meet the serial
Modbus.
2, Modbus agreement profile
Modbus agreement including ASCII, RTU
and TCP transfer mode, support the traditional
RS-232 and
RS-422, RS-485 and Ethernet
equipment. As for the serial port Modbus
equipment, controller, in standard
Modbus network protocol can be based on
two transmission mode: ASCII mode or RTU mode. As
for
Ethernet Modbus equipment, transfer
mode is Modbus/TCP protocol. The same transport
model and
parameters must choose on the
network of all equipment Modbus. Modbus agreement
is independent of
hardware. Instead,
the physical layer, it only defines the structure
of data, the controller can distinguish.
However, network communication is not
defined. Modbus agreement stipulated the
information and data
1
structure, command and
response way. The agreement to the Lord to/from
method is used to data
communication. A
host of the request of the information, and the
response from the machine and the Lord
returns to the correct information of
information in response to request to receive.
Host can also sends
messages to modify
the data from the machine.
Modbus
agreement need validation data. Serial protocol
has check, in addition, ASCII mode to use
LRC check, RTU mode and use 16 CRC
checking. But, no additional provisions TCP mode
examinations,
because the TCP protocol
is a reliable agreement, and face a connection. In
addition, the use of Modbus
master-
slave way, sending and receiving fixed time in the
material. In practice, if some affiliate equipment
separate, Lord can be diagnosed it,
fault be repaired, the network can automatic
connection. Therefore,
Modbus agreement
is reliable. Because the news of Modbus agreement
structure, each controller need a
device address, this is used to
distinguish between news and the judge will take
some actions. If the
response is
necessary, controller will produce the reply and
Modbus agreement transmitted to one side of
the inquires. The design of the system
it is embedded data acquisition system of the
overall structure. In
this system,
embedded data acquisition platform is the core and
the control equipment data communication
and embedded data acquisition platform
of the agreement from station Modbus Modbus
through various.
Therefore, data
collection, data analysis, through the TCP/IP is
to realize the pretreatment of data
transmission to the operator and
engineers monitoring center. Industrial
microprocessor Atmel company is
the
AT91RM9200 as embedded data acquisition of the
core of the platform. In embedded data acquisition
platform integrating different
surrounding connection in addition, including a
serial port, CAN bus
interface, will
make the AD/DA interface RS485 interface, SD/MMC
card for reading and writing, JTAG
and
debugging debugging interface, 18 inches TFT true
color LCD screen, it CAN in data may be used for
demonstration, also has the function of
the touch screen, and integration in this
platform. Embedded Linux
operating
systems use embedded data acquisition platform,
and Modbus agreement can realize the function.
Therefore, embedded platform, we can
read the agreement through a serial port Modbus
the slave's data,
and displayed on the
LCD (touch screen) is processed, analysis and
data. At the same time, can transmit
data, through the Ethernet interface
embedded platform, for further the monitoring and
management of the
monitoring center
after analysis and processing.
4,
design and Modbus agreement under the environment
of embedded Linux implementation
4.1,
embedded Linux system and transplantation with the
development direction of Linux, one of
many successful and embedded Linux
mature product. Stability, reliability and high
efficiency of the
embedded Linux is
proof that the facts. Embedded Linux open source
code, to provide technical support,
has
good expansibility widely, support a variety of
hardware. All of these are the embedded Linux
advantage. The system USES the embedded
hardware environment for Linux operating system
and ARM9.
At present, the ARM of a
series of Linux support ARM processor, including
ARM610, ARM710,
ARM720Tcores,
ARM920Tcores, StrungARM110, SrtongARM1100, XScale
and etc of the board
2