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ATS80 Flow Control High Water Mark
This S Register controls when your modem uses flow control to stop data from your computer.
Data to be sent by your modem is stored in a ‘buffer’ (a temporary storage area) until it can be
sent by your modem. If the buffer begins to fill, your modem will use flow control to stop your
computer sending more data.
S Register 80 allows you to set the level at which the modem will use flow control stop your
computer sending more data. Unless you have a sound reason for doing so, the high water mark
should never be set higher than 75%. Using a higher water mark may cause problems with
computers that are slow to respond to your modem’s flow control.
Each unit is equivalent to 5% of your modem’s buffer.
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Do not change the value of this S Register unless you are an experienced
communications user. An inappropriate value may cause flow control between
your computer and modem to become unreliable.
Refer to the chapter titled ‘Getting Started’ for details of flow control.
Examples
ATS80=12 Use flow control when the buffer becomes 60% full
Default
15 (75% of the buffer)
See Also
S Register 81 Flow Control Low Water Mark
&K command Flow Control
Range
1-19