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AT Commands for the Multi-Tech Modem ION 7500 / ION 7600 User’s Guide
Page 284 Modem AT Commands Technical Note
P Pulse Dialing P, T T
Configures the modem for pulse (non-touch-tone)
dialing. Dialed digits are pulsed until a T command or
dial modifier is received.
Sr=n Set Register Value
r = S-register
number; n varies
None
Set value of register Sr to value of n, where n is entered
in decimal format. E.g., S0=1.
T Tone Dialing P, T T
Configures the modem for DTMF (touch-tone) dialing.
Dialed digits are tone dialed until a P command or
dial modifier is received.
&Gn
V.22bis Guard Tone
Control
n = 0, 1, or 2 0
&G0 Disable guard tone.
&G1 Set guard tone to 550 Hz.
&G2 Set guard tone to 1800 Hz.
Note: The &G command is not used in North America.
&Pn
Pulse Dial Make-to-
Break Ratio Selection
n = 0, 1, or 2 0
&P0 60/40 make-to-break ratio
&P1 67/33 make-to-break ratio
&P2 20 pulses per second
Note: The &P2 command is available only if the
country code is set to Japan.
&Qn
Asynchronous
Communications Mode
n = 0, 5, 6, 8, or
9
5
&Q0 Asynchronous with data buffering. Same as \N0.
&Q5 Error control with data buffering. Same as \N3.
&Q6 Asynchronous with data buffering. Same as \N0.
&Q8 MNP error control mode. If MNP error control is
not established, the modem falls back according to the
setting in S36.
&Q9 V.42 or MNP error control mode. If neither error
control is established, the modem falls back according
to the setting in S36.
\An
Select Maximum MNP
Block Size
n = 0, 1, 2, or 3 3
\A0 64-character maximum.
\A1 128-character maximum.
\A2 192-character maximum.
\A3 256-character maximum.
\Nn
Error Correction Mode
Selection
n = 0–5, or 7 3
\N0 Non-error correction mode with data buffering
(buffer mode; same as &Q6).
\N1 Direct mode.
\N2 MNP reliable mode. If the modem cannot make
an MNP connection, it
disconnects.
\N3 V.42/MNP auto-reliable mode. The modem
attempts first to connect in V.42 error
correction mode, then in MNP mode, and finally in
non-error correction (buffer)
mode with continued operation.
\N4 V.42 reliable mode. If the modem cannot make a
V.42 connection, it disconnects.
\ N5 V.42, MNP, or non-error correction (same as \N3).
\ N7 V.42, MNP, or non-error correction (same as \N3).
\Tn Inactivity Timer n = 0, 1–255 0
Sets the time (in minutes) after the last character is sent
or received that the modem waits before
disconnecting. A value of zero disables the timer.
Applies only in buffer mode.
Note: You can also set the inactivity timer by changing
the value of S30.
-Cn Data Calling Tone n = 0 or 1 0
-C0 Disable V.25 data calling tone to deny remote
data/fax/voice discrimination.
-C1 Enable V.25 data calling tone to allow remote
data/fax/voice discrimination.
%Cn
Data Compression
Control
n = 0 or 1 1
%C0 Disable V.42bis/MNP 5 data compression.
%C1 Enable V.42bis/MNP 5 data compression.
Command Values Default Description