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Honeywell霍尼韦尔51109919-100
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51109919-100
51109919-100
51109919-100
为了让嵌入式WinCE和多块LPC935单片机进行通信,关键是要有一个好的通信协议。包括对数据的形式、通信方式、传送速度、传送步骤、检错方式以及控制字符定义等问题做出统一规定[5].由硬件平台的设计可以知道,每块分板控制着4个比色池,每个比色池可以设定3个检测通道,因此每块分板可以控制12个检测通道,并把它编号为1-12.但是每块分板每次只能从每个比色池的3个通道中选着1个通道进行检测,每次只能同时进行4通道的检测。整个系统可以同时进行16通道的检测。CAN通信报文传输的帧格式有含有11位标识符的标准帧和含有29位标识符的扩展帧。本设计采用了标准帧的格式进行CAN通信协议的设计。
1) 主板下传命令给分板时通信协议的设定
标识符的设置:把11位标识符的高四位固定为1010,随后的2位为分板的编号(0-3),第7位设为0表示读取AD,设为1表示设置比色池LED发光强度,低四位设成检测通道(1-12),至此,11位标识符被设定好。
数据域的设置:当第7位设为0时,数据部分为一个字节(小于16),表示检测项目,与标识符的低四位相同。分板在接收到时调整相应到相应的检测状态。当第7位设为1时,设置/校准发光管。标识符的低四位为检测通道,数据部分为3个字节。
2)分板上传数据/命令给主板时通信协议的设定
标识符的设置:11位中的高4为固定为1010,随后的2位为分板的编号(0-3),第7为为0,低四位设成检测通道(1-12)。
数据域的设置:共8个字节
分板上传命令时标识符与上传数据相同,数据部分为一个字节,当为“0x0b”表示按下了检测按键,当为“0x0A”表示对上次命令已经处理完成。
波特率设定:设为50K.
滤波设置:主板只对标识符高4位滤波,值为1010.
分板只对标识符高6位滤波,值为1010XX,XX为分板编号0-3.
例如要对一号分板的***比色池的1号通道的检测项目进行检测:如已经校准,将标识符设置为10100000001,其后跟上相应设置的数据域,即可以对一号分板的***比色池的1号通道的检测项目进行检测。如未校准,将标识符设置为10100010001,加上相应设置的数据域进行校准,校准候按照前面的步骤进行检测。同样1号通道上传数据/命令可以根据上面写好的通信协议进行操作。
5.结论
CAN通信***早应用于汽车领域,随着科技的发展,目前CAN通信在计算机控制系统中已经得到了广泛的应用,本文通过嵌入式WinCE与多块LPC935单片机底板CAN通信研究开发,综合了嵌入式、单片机及网络通信技术实现了多路CAN通信,达到了***初的设计目的。本文设计的通信协议经实践证明稳定可靠,保证了底板与WinCE控制板之间信息传输的实时性与准确性。提高了数据的准确率,减少了丢包率。本文所采用的技术在近距离控制,远程控制与
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