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Flow control (or handshaking) is a method used by various devices to cope when one device is sending data to the other faster than it is being processed. The receiving device can ask the sending device to pause while it catches up. For example, if a printer's buffer is full of data that it still has to print, it tells the computer to stop sending data until it is ready to accept more.
There are two methods of flow control which can be configured using the Serial Manager:
Flow control is usually necessary because there can be different
data transfer speeds between two computers connected
with modems.