详细说明：自已用DELPHI编写的MODBUS测试软件及源代码，需要的朋友可以参考一下。MODBUS 协议为开放式的协议，采用轮询方式。MODBUS分为MODBUS RTU/ASCII、MODBUS TCP、MODBUS PLUS几种，对应于不同的硬件平台，世界上大多数的仪器和仪表，大多数的控制器都采用或支持该协议。学习和掌握本协议，对工控网友来说，非常有意义。

 相关搜索: delphi delphi modbus modbus delphi 

 [0590_s7_200_ppi_test.zip] - 一个具体说明如何利用delphi与s7-200PLC连接的示例程序。
 [chuankoutongxin.rar] - 本文详细地讲述了串口通信的整个过程和流程，程序文件按章存放，由浅入深，是研究串口通信的很不错的帮手。
 

文件列表(点击判断是否您需要的文件):
  econv230
  ........\device
  ........\......\384stc3mingde.txt
  ........\......\384stc3mingde.txt.bak
  ........\......\help.txt
  ........\......\jinshicejing.TXT
  ........\......\jinshicejing.TXT.bak
  ........\......\mds1.TXT
  ........\......\mds1.TXT.bak
  ........\......\mds102.txt
  ........\......\mds102.txt.bak
  ........\......\mds104.txt
  ........\......\mds104.txt.bak
  ........\......\MDS111.TXT
  ........\......\mds1ASCII.TXT
  ........\......\mds1RTU.TXT
  ........\......\rep
  ........\......\...\mingde0411230001.TXT
  ........\......\...\mingde0411230002.TXT
  ........\......\...\mingde0411230003.TXT
  ........\......\...\mingde0411230004.TXT
  ........\......\...\mingde0411230005.TXT
  ........\......\...\mingde0411230006.TXT
  ........\......\...\mingde0411230007.TXT
  ........\......\...\mingde0411230008.TXT
  ........\......\...\mingde0411230009.TXT
  ........\......\...\洪云MDS1V8.TXT
  ........\......\...\洪云MDS1V8TEST.TXT
  ........\......\...\珠海亚泰040813.TXT
  ........\......\stc1.txt
  ........\......\stc1.txt.bak
  ........\......\stc101.TXT
  ........\......\stc101.TXT.bak
  ........\......\stc102.TXT
  ........\......\stc102.TXT.bak
  ........\......\STC112.TXT
  ........\......\STC112.TXT.bak
  ........\......\stc1ascii.TXT
  ........\......\stc1ascii.TXT.bak
  ........\......\stc1gsmsms.TXT
  ........\......\stc1gsmsms.TXT.bak
  ........\......\STC1RTU.TXT
  ........\......\STC1RTU.TXT.bak
  ........\......\stc2.txt
  ........\......\stc2.txt.bak
  ........\......\stc204rtu.TXT
  ........\......\stc204rtu.TXT.bak
  ........\......\stc204rtuV1.8.TXT
  ........\......\stc205.TXT
  ........\......\stc205.TXT.bak
  ........\......\stc205v4.TXT
  ........\......\stc205v4.TXT.bak
  ........\......\stc2ASCII.TXT
  ........\......\stc2ASCII.TXT.bak
  ........\......\stc2rtu.txt
  ........\......\stc2rtu.txt.bak
  ........\......\stc3-hui-an.txt
  ........\......\stc3-hui-an.txt.bak
  ........\......\stc3.txt
  ........\......\stc3.txt.bak
  ........\......\stc3mingde.TXT
  ........\......\stc3mingde.TXT.bak
  ........\......\stc3rtu38400.TXT
  ........\......\stc3rtu38400.TXT.bak
  ........\......\stc3rtu9600.TXT
  ........\......\stc3rtu9600.TXT.bak
  ........\......\xiaotong.TXT
  ........\......\xiaotong.TXT.bak
  ........\help.txt
  ........\help.txt.bak