Complete Protocol dictionary, glossary and reference
XON/XOFF is software data flow communications protocol for controlling the flow of data between computers and other devices. X stands for transmitter. XON/XOFF is frequently referred to as "software flow control". Typically, the receiver will send an XOFF character, when it can't take any more data (e.g. it may need time to process something), and when it can once again take more data, will send an XON character to the transmitter.