AT&T DataPort PCX Modem User Manual page 45

AT Commands and S-Registers
Table B-1. AT Command and S-Register List (6 of 21)
AT Command/
S-Register
M n
N n
O n
P
B-6
Issue 2
Description
SPEAKER ON/OFF CONTROL
Determines the status of the modem's speaker.
M, M0 Speaker always Off.
M1 Speaker On until carrier signal becomes
active.
M2 Speaker always ON.
M3 Speaker off while dialing, on while
handshaking, until carrier signal becomes
active.
AUTOMODE ENABLE
Enables or disables Automode detection. The setting
of N is affected by the ATF n command: ATF0 is
equivalent to N1; ATF1 through F10 set N to 0.
However, the N1 command does not set an F n value.
When F0 (Automode) is active but N0 (Disable
Automode) is issued, subsequent connections are
attempted at the most recently sensed DTE rate.
N0 Disables Automode detection.
N1 Enables Automode detection.
RETURN ONLINE TO DATA MODE
When the DataPort PCX modem is set to AT+H0 (RPI
disabled), AT0 forces the modem from online
Command mode to Data mode, with or without a
retrain. If result codes are enabled, the O command
also displays the current VF rate. When RPI is
enabled, AT0 is not supported.
O, O0 Returns to online Data mode without a
retrain.
O1 Retrains then returns to online Data mode.
PULSE DIAL
Specifies rotary-type dialing. See D n.
July 1995