介绍了一个以单片机DS80C320为控制器的点阵LED显示屏控制系统。该系统采用RS-232/RS-485通信标准,通过DS80C320的串行接口接收PC机的控制命令及显示数据,经处理后控制LED显示屏的扫描显示。该系统采用了一种新型的大容量闪速存储器29F040作为数据存储器。本文中给出了该控制系统的软硬件设计要点。
上传时间: 2015-11-05
上传用户:chongcongying
<%@ LANGUAGE="VBSCRIPT" %> <!--#include file="conn.asp"--> <% set rs=server.createobject("adodb.recordset") sqltext="select * from RegUser where UserId= " & request.form("uid") & " " rs.open sqltext,co
标签: lt LANGUAGE VBSCRIPT include
上传时间: 2013-12-08
上传用户:yuanyuan123
基于RS-485的单片机多机通信控制系统协议的实现方案
上传时间: 2013-11-29
上传用户:huyiming139
The purpose of this application note is to describe the main elements of an RS-422 and RS-485 system. This application note attempts to cover enough technical details so that the system designer will have considered all the important aspects in his data system design. Since both RS-422 and RS- 485 are data transmission systems that use balanced differential signals, it is appropriate to discuss both systems in the same application note. Throughout this application note the generic terms of RS-422 and RS-485 will be used to represent the EIA/TIA-422 and EIA/TIA-485 Standards.
标签: application describe elements purpose
上传时间: 2013-12-29
上传用户:sxdtlqqjl
计算机通信与rs-232接口实用指南\计算机通信与rs-232接口实用指南
上传时间: 2013-11-26
上传用户:qw12
什么是RS-232-C接口?采用RS-232-C接口有何特点?传输电缆长度如何考虑?
上传时间: 2013-12-30
上传用户:远远ssad
st7920 128*64测试程序sbit RS = P1^0 sbit RW = P1^1 sbit E = P1^2
上传时间: 2014-01-11
上传用户:lanjisu111
rs
标签: rs
上传时间: 2014-02-24
上传用户:czl10052678
rs
标签: rs
上传时间: 2015-11-22
上传用户:标点符号
RS-485接口具有较强的抗干扰性,数据传输的距离较远,在一些应用中常常需要把RS-232标准的信号转换为RS-485的标准信号进传输。图中所示电路允许数据在RS-232/RS-485这两个不兼容的串行数据接口间传递。传输速度为480波特时,传输距离可达1750米。图中双RS-232收发器IC1将主机(PC)输出的RS-232电平转换为TTL电平,驱动高速RS-485收发器IC2 的输入,倒相器使IC2、IC3在受到起始位时被激活。
上传时间: 2015-11-25
上传用户:zuozuo1215