LabVIEW8.6环境下，可发送和接收帧头+modbus报文+帧尾的数据。程序易于修改，含有多态函数，子函数及一个交流负载通信的实例函数。-LabVIEW8.6 environment, can send and receive tail fr a me head+ modbus message+ fr a me data. Easy to modify, the program contains polymorphic function, communication function and