MODBUS主、子站规约模拟程序。可以做为MODBUS规约测试的工具，既可以模仿主站，也可以模仿子站。打开串口后，程序会自动应答。-MODBUS owners, the statute stands for simulation program. MODBUS statute can be used as a testing tool, we can imitate the main station, can also imitate Subsite. Serial opened, the pr