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C-4 User’s Manual
AT Commands
Nn Modulation handshake
This command controls whether or not the local modem performs a
negotiated handshake at connection time with the remote modem when the
communication speed of the two modems is different.
N0 When originating or answering, this is for handshake only at
the communication standard specified by S37 and the ATB
command.
N1 When originating or answering, begin the handshake at the
communication standard specified by S37 and the ATB
command (default).
During handshake, a lower transmission speed may be
selected.
Result Codes:
OK n=0,1
ERROR Otherwise
On Return on-line to data mode
O0 Instructs the modem to exit on-line command mode and
return to data mode (see AT escape sequence, +++).
O1 This command issues a retrain before returning to on-line
data mode.
O3 This command issues a rate renegotiation before returning to
on-line data mode.
Result Codes:
OK n=0,1,3
ERROR Otherwise
P Select pulse dialing
This command configures the modem for pulse (non touch-tone) dialing.
Dialed digits are pulsed until a T command or dial modifier is received.
Tone dial is the default setting.
Qn Result code control
Result codes are informational messages sent from the modem and
displayed on your monitor. Basic result codes are OK, CONNECT, RING,
NO CARRIER, and ERROR. The ATQ command allows the user to turn
result codes on or off.
Q0 Enables modem to send result codes to the computer
(default).
Q1 Disables modem from sending result codes to the computer.
Result Codes:
OK n=0,1
ERROR Otherwise