Description: 目前在工业控制领域,单片机系统主要通过RS232、RS485和CAN总线协议通信,它们无法直接与互联网连接,因此该系统处于与互联网隔绝的状态。这些系统广泛采用低成本8位单片机,而这种单片机一般只具有RS232异步串行通信接口,要接入到互联网必须进行通信接口改造,这种改造不仅是接口的物理改造,更关键是数据格式的改造和通信协议的转换。本文提出一种RS232串行通信接口与RJ45以太网接口转换器的设计方案,已有的单片机系统可以通过该转换器接入到以太网,进一步接入互联网。-Currently in the field of industrial control, single-chip microcomputer system mainly through RS232, RS485 and CAN bus protocol communications, they can not be directly connected to the Internet, so the system is in a state of isolation and the Internet. These systems are widely used in low-cost 8-bit MCU, which generally has a single-chip RS232 asynchronous serial communication interface, to access to the Internet must be communication interface transformation, such transformation is not only the physical interface transformation, more crucial is the transformation of data format and communication protocol conversion. In this paper, a RS232 serial communication interface with RJ45 Ethernet interface converter design, the existing single-chip microcomputer system via the access to Ethernet converter, and further access to the Internet. Platform: |
Size: 1908736 |
Author:郑宏超 |
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Description: 这是本人耗费2周时间精心制作的PPT演示动画文档，专门讲述嵌入式以太网一卡通设备和传统RS485设备的对比。绝对原创！-This is the time I spent two weeks carefully crafted animation PPT document devoted to embedded Ethernet card equipment and traditional RS485 devices contrast. Absolute originality! Platform: |
Size: 201728 |
Author:刘生 |
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Description: 介绍工业串口液晶显示触摸屏与人机界面组态软件HMImaker的开发指南，工业液晶显示触摸屏是一种包含TFT LCD显示屏、LCD控制器、触摸屏、人机界面组态软件系统和单片机TTL电平串口，RS232，RS485，以太网等通讯接口于一体的嵌入式智能显示终端。工业串口液晶显示触摸屏技术开发是基于嵌入式控制系统采用FPGA纯硬件驱动显示，无任何操作系统，零启动时间，上电即刻运行，速度和可靠性领先于其他方案。系统配套自主研发设计的，具有知识产权保护的人机界面组态软件HMImaker设计界面，可“所见即所得”、“0”代码快速生成炫酷图形界面，让开发嵌入式图形界面，如“制作PPT”一样简单、快速！支持各种通讯协议，比如单片机协议，modbus协议，西门子PLC协议，三菱PLC协议，台达PLC通讯协议等，支持各种组态控件，关联通讯变量地址即可与下位机通信，10分钟内完成人机界面设计。-Introduction industrial serial LCD guide the development of touch screen and man-machine interface configuration software HMImaker, industrial LCD touch screen is one kind contains the TFT LCD screen, LCD controller, touch screen, man-machine interface configuration software system and single-chip serial TTL level, RS232, RS485, embedded intelligent Ethernet communication interface display terminal. Industrial serial LCD touch screen technology development is embedded control system adopts FPGA display based on pure hardware drivers, without any operating system, zero start-up time, power on immediate operation, the speed and reliability of ahead of the other scheme. System supporting the independent research and development design, with the protection of intellectual property rights of the HMI configuration software HMImaker to design the interface, can be WYSIWYG , 0 code generated rapidly cool graphical interface, make the development of embedded graphical user interface, such as Platform: |
Size: 25436160 |
Author:陈秋荣 |
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Description: LPC4357开发板采用ARM的Cortex-M4微控制器LPC4357。内置一个ARM Cortex-M0协处理，CPU运行频率高达204MHz，片内集成1MB Flash和36KB SRAM。开发板采用独立核心板设计，核心板集成64MB SDRAM、128MB NAND-Flash、4MB SPI-Flash。核心板上的摄像头接口可直接连接各种型号的摄像头，两侧160P排针接口引出了除EMC总线外的LPC4357芯片所有功能管脚。
开发板提供丰富的外设接口，包括以太网、液晶屏、摄像头、USB-Host、USB-OTG、SD卡、RS232、RS485、CAN、耳机、麦克风、温度传感器、AD/DA、JTAG仿真器等。此外，开发板提供一个14P扩展接口，包括1路UART、1路SPI、1路I2C、4个IO、3.3V、5V，可以很方便的扩展自己的外围电路。-DS-LPC4357 development board using the Cortex-M4 microcontroller LPC4357 ARM s. A built-in ARM Cortex-M0 co-processor, CPU operating frequency up to 204MHz, 1MB Flash and 136KB SRAM integrated on chip.
Development board using an independent core board design, the core board integrates 64MB SDRAM, 128MB NAND-Flash, 4MB SPI-Flash. Camera core board interface can be directly connected to various types of cameras, both sides 160P pin interface leads to the outside of the bus in addition to EMC LPC4357 chip all the functions of the pins.
Development board provides a rich set of peripheral interfaces, including Ethernet, LCD screen, camera, USB-Host, USB-OTG, SD card, RS232, RS485, CAN, headphone, microphone, temperature sensor, AD/DA, JTAG emulator, etc. . In addition, the development board provides a 14P expansion interfaces, including one-way UART, 1 road SPI, 1 channel I2C, 4 个 IO, 3.3V, 5V, can easily expand their peripheral circuits. Platform: |
Size: 2249728 |
Author:GREENLANDL |
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Description: 基于TCP/IP通讯的仪器仪表应用层协议架构由于新一代仪器仪表的数据量大，传输距离远，实时性高，传统的基于RS232/RS485的串行数据传送方式已不能满足要求，而基于TCP/IP的以太网数据通讯方式,传输距离大(通过internet，理论上无限远)，速度快，是当前新一代仪器仪表数据传输的理想方式。
基于单片机(如MCS51+RTL8019AS)的以太网接入技术已经相当成熟，可以方便的与PC机连接。根据仪器仪表嵌入式应用的要求（如实时性），我们采用TCP协议或UDP协议进行数据传输。TCP是一种可靠的传输协议，但效率相对较低，UDP是一种由用户自己来保证传输可靠性的传输协议，但效率较高。
本协议目前采用TCP，以太网接口模块作为服务器方，任何时候仅提供一个连接。
本文档的适用范围为带有以太网接口模块的仪器仪表。
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Instruments based application layer protocol architecture TCP/IP communication since the new generation of instrumentation data capacity, transmission distance, high real-time, based on the traditional serial data transfer mode RS232/RS485 can not meet the requirements, and based on TCP/IP Ethernet data communication mode, the transmission distance is large (via internet, theoretically infinite) speed, is the ideal way to present a new generation of instrumentation data transmission.
Microcontroller-based (such as MCS51+ RTL8019AS) Ethernet access technology is already quite mature, it can be easily connected to a PC. According instrumentation embedded applications (such as real-time), we use the TCP protocol or UDP protocol for data transmission. TCP is a reliable transport protocol, but the efficiency is relatively low, UDP is a transmission by the users themselves to ensure the reliability of the transmission protocol, but more efficient.
The protocol currently used TCP, Etherne Platform: |
Size: 18432 |
Author:宇龙 |
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