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6-6 PRO/100 LAN+Modem PC Card User’s Guide
Cn Carrier Control
The ATCn command, where n is 1, guarantees backward compatibility
with communications software that issues the C1 command. C0 is not
supported; it may set some modems to "receive only mode."
C0 Transmit carrier always off (not supported).
C1 Normal transmit carrier switching.
Dn Dial A Telephone Number
The ATDn command is used to dial a telephone number. The n repre-
sents a dial string consisting of dial digits/characters and dial modifiers
(see below) and must not exceed 40 characters. Spaces, hyphens, and
parentheses can be used for clarity, but they are ignored by the modem.
The Dial command can be used for either pulse (rotary) or tone dialing.
The dial digits/characters are 0 - 9 A B C D # *. The characters A B C D
and the symbols # and * represent specific tone pairs and can be used
only when tone dialing. These characters and symbols are ignored when
pulse dialing is used. Some countries restrict or prohibit the use of some
of these characters.
Dial Modifiers
Dial modifiers are recognized by the modem only when they are part of a
dial string following the ATD command. Possible dial modifiers are:
L Redial Last Number
Redials last number if used as first character following ATD. Other-
wise it is ignored.
P Pulse Dialing Method
The P modifier is used with the Dial command to instruct the
modem to pulse dial the telephone number that follows.