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Transparent XON/XOFF flow control is selected by issuing the &K5 command.
Failsafe Flow Control
Failsafe flow control is designed specifically for UNIX computers running the UUCP file
transfer protocol. This form of flow control only affects data being transmitted from the
computer to the modem.
When the modem’s data buffer approaches maximum capacity, the modem will lower the CTS
signal. If the computer does not pause the transmission of data within a few character durations
of CTS going low, the modem will send an XOFF to the computer.
When the modem is ready to accept more data from the computer it will assess CTS. If an
XOFF was sent to pause transmission, the modem will also send an XON character.
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Failsafe flow control only affects data being transmitted from the computer to the
modem. Flow control is not supported for data being transmitted by the modem to
the computer. Failsafe flow control is selected by issuing the &K9 command.
The Inactivity Timer
Your modem supports an inactivity timer. When your modem is on line, if it does not
communicate with either the remote modem or your computer for a specified length of time, it
will hang up and return to local command state.
The AT\T command specifies the number of minutes the modem stays on line when no activity
is occurring. The timer may be set from 1 to 255 minutes.
For example:
AT\T5
This allows the modem to be inactive in on-line state for five minutes before hanging up the
default time is 0 minutes the timer is disabled. The inactivity timer is only available when MNP
or constant speed mode is selected. It is ignored in variable speed mode.
The Command Timer
If you do not complete an AT command within 60 seconds (that is, type the command and press
ENTER), the command will be discarded and an error message will appear. The length of time is
controlled by S Register 69 and can be turned off by setting S Register 69 to 0.