Modem Operation A-9
%C Compression. When enabled, compresses data to
improve data transfer times using the Stac
compression method. The following check modes
are available–None, One Byte Sequence Number,
Extended. Extended is the preferred method.
%C0 disables compression.
%C2 enables compression.
&C Serial port CD control
&C0 forces CD to remain on at all times.
&C1 forces CD to follow the state of carrier from
the remote system. CD turns on after
CONNECT message is sent to host (default).
&C2 forces CD to remain on except temporarily
after disconnect.
D Dials an outgoing 56/64 Kbps circuit-switched
digital connection.
DD Dials an outgoing Toll Saver (56 Kbps permissive)
connection.
&D DTR control
&D0 causes ISDN modem to ignore DTR from
host.
&D1 causes ISDN modem to enter command
state on detecting on-off transition of DTR.
&D2 causes ISDN modem to hang up current
calls upon on-off transition of DTR and
prepares serial port to accept AT command
at any speed (default).
E AT command echo
E0 disables the echo of AT commands back to
the host computer.
E1 enables the echo of AT commands to the
host computer (default).
Command Description