XM1240S AT Commands Reference Manual
No. XM1240S-A00-106
xmodus swiss GmbH
16 / 46
3.4 AT&
COMMANDS
3.4.1 AT&Cn
DCD Options.
The modem controls the DCD output in accordance with the parameter supplied. The
parameter value, if valid, is written to S48 bit 0.
AT&C0
DCD remains ON at all times.
AT&C1
DCD follows the link state and therefore indicates that a connection is
established. (default)
3.4.2 AT&Dn
DTR Control
This command interprets the ON to OFF transition of the DTR signal from the DTE in
accordance with the parameter supplied. The parameter value, if valid, is written to
S47 bits 0 and 1.
AT&D0
DTR is ignored (assumed ON). Allows operation with DTE’s which do
not provide DTR.
AT&D2
DTR drop causes the modem to hang up. An existing ISDN connection
will be terminated. Auto-answer is inhibited when DTR is inactive
(default).
AT&D4
DTR drop causes the modem to hang up. An existing ISDN connection
will be terminated. Auto-answer is not inhibited when DTR is inactive
3.4.3 AT&Fn
Load Factory Defaults
The isdn-modem loads the factory configuration (profile). The factory defaults are
identified for each command and in the S-Register descriptions. A configuration
(profile) consists of a subset of S-Registers. MSN’s and Phone numbers stored will
not be overwritten.
AT&F
= Restore factory configuration.
3.4.4 AT&Kn
Flow Control
This command defines the DTE/DCE (terminal/modem) flow control mechanism. The
parameter value, if valid, is written to S39 bits 0, 1, and 2.
AT&K0
Disables flow control.
AT&K3
Enables RTS/CTS flow control. Default for data modem modes.
(default).
AT&K5
Enables RTS/CTS flow control in data mode and command mode.
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