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Table B-1. AT Command and S-Register List (3 of 34)
AT
Command/
Description
S-Register
Dial Command Modifiers (continued)
R
@
!
$
Spaces, hyphens, and parentheses
Reverse Dial mode. Causes the originating
DataPort 2001 to send out an answertone
once it no longer detects ringback.
(Ringback is the ring you hear at the
originating site when making a call.) The R
parameter must be the last character in
the dial string. For correct operation, at
least one ringback must be detected;
therefore, the remote modem should be
placed off-hook into Originate mode on the
second ring or later.
Quiet answer. The DataPort 2001 waits for
5 seconds of silence after dialing
the number. If silence is not detected, the
DataPort 2001 sends a NO ANSWER
result to the computer.
Hook flash. The DataPort 2001 goes
on-hook for 0.5 seconds, then returns
off-hook.
AT&T Calling Card Tone Detect. The
DataPort 2001 awaits the AT&T Calling
Card Tone. If the Calling Card Tone is not
detected in the amount of time specified by
S7 (No-Answer Timeout), the DataPort
2001 sends NO CARRIER or (for cellular
operation) NO ANSWER to the computer.
These may be included for readability, but
do not affect dialing.
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