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What is flow control and how does it work?

April 26, 2017CONTROL flow

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What is flow control and how does it work?

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XON/XOFF is one kind of flow control. In ASCII, XON is the character, and XOFF is the . XON/XOFF flow control is typically associated with asynchronous serial line communications. XON/XOFF is an in-band flow control, meaning that the flow control is mixed in with the data. CTS/RTS is another type of flow control, and is sometimes called hardware flow control. Out-of-band means that seperate lines/pins from the data lines (pins) are used to carry the CTS/RTS signals. Both kinds of flow control are triggered when a threshold is reached in the incoming buffer. The flow control is suppose to reach the transmitter in time to have it stop transmitting before the receiver buffer is full and data is lost. Later, after a sufficient amount of the receiver’s buffer is freed up, the resume flow control signal is sent to get the transmitter going again. 14-48 Hardware Information DECnet Phase IV on OpenVMS VAX supports the use of asynchronous serial communications as a network line