HLP A+ Modbus 标准通讯协议格式，上位机发送数据格式，正确时变频器返回数据格式-This bit will be set to logic 1 when the receive buffer has been read and contains no new information. If there is new information available in the receive buffer that has not been read, this bit will

modbus 驱动程序 包含 modbus.h modbusstr.h rxd.c txd.c 测试代码.c 主文件main.c-modbus driver contains modbus.h modbusstr.h rxd.c txd.c Test code. C Master file main.c