目 录
引言.......................................................................................................................1
1 集中抄表系统的发展及概况.........................................................................1
1.1 电集中抄表系统 ................................................................................................1
1.2 国内外发展的概况.............................................................................................2
1.3 住宅抄表自动化系统应用条件............................................................................3
2 方案论证与比较.............................................................................................3
2.1 抄表部分 ..........................................................................................................3
2.1.1 方案 1： ..............................................................................................................................................3
2.1.2 方案 2： ..............................................................................................................................................3
2.1.3 方案 3： ..............................................................................................................................................3
2.2 数据传输部分....................................................................................................4
2.2.1 方案 1： ..............................................................................................................................................4
2.2.2 方案 2： ..............................................................................................................................................4
2.2.3 方案 3： ..............................................................................................................................................4
3 系统硬件设计.................................................................................................5
3.1 电能表模块电路设计 .........................................................................................5
3.1.1AT89C51 介绍.....................................................................................................................................6
3.1.2 固态继电器.........................................................................................................................................9
3.1.3 光电转换电路设计 .........................................................................................................................10
3.1.4 电流检测电路 ..................................................................................................................................11
3.1.5 单片机系统电路..............................................................................................................................12
3.2 CAN 总线接口电路的设计 .................................................................................12
3.2.1CAN 总线概况 ..................................................................................................................................12
3.2.2SJA1000 介绍 ....................................................................................................................................13
3.2.3 与 PCA82C200 兼容性..................................................................................................................16
3.2.4PCA82C250/251 收发器................................................................................................................17
3.2.5RS-232 标准 ......................................................................................................................................18
3.2.6MAX232 芯片简介..........................................................................................................................21
3.2.7CAN 总线接口电路 .........................................................................................................................23
3.2.8 硬件电路 ...........................................................................................................................................24
4.软件设计.........................................................................................................25
4.1 主程序设计流程图如图 4.1 所示 .......................................................................25
4.2 抄表模块软件设计...........................................................................................26
