ModBus协议简介及移植到STM32单片机
https://blog.csdn.net/silent123go/article/details/92440091
Modbus测试工具ModbusPoll与Modbus Slave使用方法
https://blog.csdn.net/byxdaz/article/details/77979114
ModbusPoll与Modbus Slave的tcp连接步骤和python modbus实例
https://blog.csdn.net/qq_39143076/article/details/84853117
modbus slave工具
http://www.cr173.com/soft/21410.html
modbus poll工具
http://www.cr173.com/soft/21405.html
python modbus库文档和github
https://pymodbus.readthedocs.io/en/latest/#
https://github.com/riptideio/pymodbus/blob/master/doc/index.rst