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Modem Commands C-11
Table C-4
Dial Modifiers
Modifier Description
L Redial Last Number. L instructs the modem to redial the last number dialed since power
was applied to the system. This should be the first command after ATD; otherwise, the
modem ignores the command.
P Pulse Dialing. P instructs the modem to use pulse dialing until tone dialing (T) is selected.
S=n Dial Stored Number. S=n instructs the modem to dial a telephone number previously
stored using the &Zn=number command. The range of n is 0 - 3.
T Tone Dialing. T instructs the modem to use tone dialing until pulse dialing (P) is selected.
Tone duration and spacing are set by the S11 register.
W Wait for Dial Tone. W causes the modem to wait up to a specified time for the dial tone to
occur. The telephone number is dialed immediately upon dial tone detection. This may be
helpful when dialing through a PBX or for some long-distance services. The maximum wait
period is set in register S7.
; (semicolon) Return to Command Mode. The semicolon (;) forces the modem to remain in the
command state after dialing a number without disconnecting. The semicolon must be
placed at the end of the dial command.
@ (at character) Wait for Quiet Answer Command. The at character, @, causes the modem to look for
rings followed by seconds of silence before processing the next symbol in the dial string.
The S7 register determines the maximum wait time. If a quiet answer is detected, the dial
modifiers following the command are executed. If a busy signal is detected, the modem
returns a BUSY result code and undergoes the hang-up process, aborting further
execution of commands.
! (exclamation) Flash Hook Command. The exclamation point, (!), causes the modem to go on-hook for
0.5 seconds and then return to off-hook. Used by some PBX systems to access special
features such as call forwarding and call transfer.
, (comma) Pause During Dialing. The comma (,) causes the modem to pause for a specified time
during dialing. The duration is set by register S8.
^ (carat) Disable Data Calling Tone Transmission.
This command takes effect for the current call only.
NOTE: This command is not available in some countries.
> (greater than) Ground Start Dialing.
NOTE: This command is not available in some countries.
0 through 9 Dial Digits. Valid digits for pulse or tone dialing.
A, B, C, D, #, * Dial Characters. Valid characters for tone dialing only. A, B, C, and D are four keys added
to the right of the 369# keys for Dual-Tone Multifrequency systems.
NOTES Telephone numbers (dial strings) may be entered with or without spaces or other punctuation.
T and P modifiers are allowed anywhere in the dial string; therefore, signaling methods may be changed in some
countries after several digits are sent, if allowed in your country.
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