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software flow control
Software flow control is a method of flow control used in computer data links, especially RS-232 serial. It uses special codes, transmitted in-band, over the primary communications channel. These codes are generally called XOFF and XON (from "transmit off" and "transmit on", respectively). Thus, "software flow control" is sometimes called "XON/XOFF flow control". This is in contrast to flow control via dedicated out-of-band signals — "hardware flow control" — such as RS-232 RTS/CTS.
== Representation ==
For systems using the ASCII character code, XOFF is generally represented using a character or byte with decimal value 19; XON with value 17.
The ASCII standard does not reserve any control characters for use as XON/XOFF specifically. However, it does provide four generic "device control" characters (DC1 through DC4). The Teletype Model 33 ASR adopted two of these, DC3 and DC1, for use as XOFF and XON, respectively. This usage was copied by others, and is now a de facto standard. The keyboard equivalents of CTRL+S for XOFF, and CTRL+Q for XON, also derive from this usage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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