101 IEC标准通信协议，主要用于电力系统主站和设备之间的通讯-101 IEC standard communication protocol, mainly used in power system master station and the communication between devices

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