Ositech comm Trumpcard Data/Fax Modem User's Manual And Reference page 45

Examples
ATM0
ATM1
ATM2
ATM3
Nn — Automode Detection
Parameters
Default
This command enables or disables automode detection
Examples
ATN0
ATN1
On — Return To The On-Line State
Parameters
Default
If the user enters the command mode from the data mode by issuing the
escape sequence, or as a result of an ON-to-OFF transition of DTR with
the &D1 option in effect, the user may return to the data mode without
terminating a call by issuing the O0 command. This command may also
be used to force a retrain. If the modem is on-hook, then the modem
behaves as if it went off-hook to originate without actually taking the relay
off-hook.
Examples
ATO0
ATO1
User's Guide and Reference
Speaker is always off
Speaker is on during call establishment, but off
when connected to a remote modem
Speaker is always on
Speaker is off when dialling or connected to a
remote modem, but on during call answering
0 or 1
1
Automode detection is disabled. Subsequent
connections will be based on the setting in Register
S37, if S37=0 the speed of the connection must
match that at which the last AT command was
issued.
Automode detection is enabled. Connections will be
based on an automode algorithm. This command is
equivalent to F0 command.
0 or 1
none
Causes the modem to return to the data mode
Causes the modem to return to the data mode and
to initiate a retrain when operating at 2400 bps.
Also, adjusts the transmit level at 2400 bps to the
Un setting.
Modem Command Reference
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