Comtrol AT Commands - Manual (Page 63)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 3-37
3.2.3 Call Control
D - Dial
This command directs the modem to go on-line, dial according to the string entered and
attempt to establish a connection. If no dial string is supplied, the modem will go on-line
and attempt the handshake in originate mode.
NOTE: If the ATD command is issued before the S1 register has cleared, the modem
will respond with the NO CARRIER result code.
If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to
connect to another data modem. The modem will have up to the period of time specified
by register S6 or S7 to wait for carrier and complete the handshake. If this time expires
before the modem can complete the handshake, the modem will go on-hook with the NO
CARRIER response. This command will be aborted in progress upon receipt of any DTE
character before completion of the handshake.
If +FCLASS=1 or 1.0 is selected, the modem will behave as a facsimile modem and
attempt to connect to a facsimile machine (or modem) by entering the HDLC V.21
channel 2 receive state (as if +FRH=3 had been issued). This command will be aborted
upon receipt of any DTE character if the modem has not finished dialing. In this case, the
modem will go on-hook and return to command mode after displaying the NO CARRIER
message. If the modem has finished dialing, it proceeds as if the +FRH=3 command has
been issued. (Refer to the +FRH command to determine how the modem behaves
following this stage.)
Dial Modifiers
The valid dial string parameters are described below. Punctuation characters may be used
for clarity, with parentheses, hyphen, and spaces being ignored.
Syntax
D<string>