MODBUS主站调试工具，仿真工具，可以模拟主站，对从站设备进行调试-MODBUS master debugging tools, simulation tools that can simulate the main station, on the slave device for debugging

实现与已有从机的通信，01030405061516功能码实现并可以查看报文，有完整的用户登录界面（自己构建一个数据库）以及记录保存。(To achieve the communication with the existing slave, 01030405061516 function code to achieve and can view the message, there is a complete user login interface (build a database) and