PC做主站， S 7-200做从站的modbus 功能码串口通讯调试S 7-200的程序和示例。谢谢。
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http://www.ad.siemens.com.cn/productportal/prods/s7-200-smart-portal/200smarttop/smartsms/020.html
http://www.ad.siemens.com.cn/service/elearning/Course/860.html
https://support.industry.siemens.com/cs/document/81012111/s7-200%E5%81%9A%E4%B8%BB%E7%AB%99s7-300-cp341%E5%81%9A%E4%BB%8E%E7%AB%99%E7%9A%84modbus-rtu%E9%80%9A%E8%AE%AF?dti=0&lc=zh-CN
https://support.industry.siemens.com/cs/document/92072868/s7-200%E4%B8%8Ev20%E4%B9%8B%E9%97%B4%E7%9A%84modbus-rtu%E9%80%9A%E8%AE%AF?dti=0&lc=zh-CN
https://support.industry.siemens.com/cs/document/90731633/s7-200%E4%B8%8Ecu230p-2-hvac%E4%B9%8B%E9%97%B4%E7%9A%84modbus-rtu%E9%80%9A%E8%AE%AF?dti=0&lc=zh-CN
https://support.industry.siemens.com/cs/document/80950958/s7-300-cp341%E4%BD%9C%E4%B8%BBs7-200%E4%BD%9C%E4%BB%8E%E7%9A%84modbus%E9%80%9A%E4%BF%A1?dti=0&lc=zh-CN
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