回应帧 meaning in English

echo frame

3 . implementing the serial communication between the cms and lms . putting forward two rules for software flow control and data transmission , as well as implementing the relevant design for command frame , return frame and data frame of them
( 3 )解决了cms与lms之间的串口无线通信问题，提出了一种软件流量控制规程与数据传输规程，并设计了相应的命令帧、回应帧及数据帧的结构。