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Virtual Modem AT Commands 203
Virtual Modem Initialization Commands
AT&Z1 Set command allows the user to store an IP
address and port number or phone number to
use when making a connection. The user will
issue an ATDS1 to cause the IOLAN to initiate
the connection.
AT&Sn Sets the behavior of IOLAN’s DTR signal.
(DSR from a DCE perspective)
n=0, DTR signal always high.
(default)
n=2, DTR signal acts as DCD.
n=3, DTR signal acts as RI.
AT&Rn Sets the behavior of IOLAN’s RTS signal. (CTS
from a DCE perspective)
If line is configured for hardware flow control,
the RTS is used for this purpose and the setting
of this command is ignored.
n=0, RTS always high. (default).
n=3, RTS signal acts as DCD.
n=4, RTS signal acts as RI.
AT&Cn Sets the behaviour of the DCD signal. n=0, DCD always on.
n=1, DCD follows state of
connection (off when no
connection, on when TCP
connection exists). (default)
AT&F Sets the modes back to the factory defaults. This
is a hard-coded default configuration which
does not look at any user configuration.
ATS2 Sets the value of the S2 register. The S2 register
controls which character is used to enter
"command" mode. (this is the potential
replacement for the +++ (default) in front of the
ATH command).
This register will hold the hex value of the
"escape" character. Any value > 27 will disable
the ability to escape into "command" mode.
ATS12 Sets the value of the S12 register. The S12
register controls the minimum length of idle
time which must elapse between the receipt of
the escape character and the A (first character of
the ATH sequence). Units are 1/50th of a
second. The default is 50 = 1 second.
ATO (ATD with no phone number) Establishes a
connection using the IP and port specified in the
telephone number field.
ATDS1 Establishes a connection using the IP and port
(or phone number) specified in the
Phone
Number
field (stored by the AT&Z1 command).
Command Description Options