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User’s Guide and Reference 4 - 21
Modem Command Reference
&Gn — Set Guard Tone
Parameters 0, 1, or 2
Default 0
Normally, controls the generation of guard tone. This command is not
implemented; however, the command structure is provided for application
compatibility.
&Jn — Telephone Jack Selection
Parameters 0 or 1
Default 0
The command structure is provided for application compatibility only and
performs no function.
&Kn — DTE/Modem Flow Control
Parameters 0, 3, 4, 5 or 6
Default 3
Determines how the modem controls the flow of data between the
communications software and the modem. When the modem terminal
buffer is nearly full, the modem will either send an XOFF command, or
drop CTS to stop the data flow. When the buffer is nearly empty, the
modem will either send an XON command, or raise CTS to start the data
flow.
The modem also responds to XON/XOFF characters, or RTS stimulus from
the communications software by suspending or resuming transmission
accordingly. The modem responds to XON/XOFF characters and also
passes the XON/XOFF characters to the remote modem as data if
transparent flow control is selected. When in Direct mode (&Q0), flow is
not used and the modem ignores the setting of this command.
Examples
AT&K0 Disables flow control
AT&K3 Enables RTS/CTS flow control
AT&K4 Enables XON/XOFF flow control
AT&K5 Enables transparent XON/XOFF flow control
AT&K6 Enables RTS/CTS and XON/XOFF flow control