User's Manual

A is usually used to manually answer an incoming call or to switch from voice conversation to data
communication.
Bn Select Protocol to 300 bps or 1200 bps
B0/B Selects ITU-T 300 or ITU-T 1200 protocol once the command line prefix AT has been
entered at the 300 bps or 1200 bps data rate.
B1 Selects BELL 300 or BELL 212A protocol once the command line prefix AT has been
entered at the 300 or 1200 bps data rate. (Default)
Cn Carrier Transmit Control
Controls the transmit carrier. The modem is preset to turn carrier on and off as necessary (the C1 option).
The signal is on when the modem is calling, or connected to a remote modem, and is off when it is not. The
C0 option is NOT valid.
C0 Not permitted; returns ERROR result code.
C1 Normal transmits carrier switching (preset).
D Go On-line in Originate Mode
D instructs the modem to go off-hook immediately and automatically dial the number contained in the dial
string following D. The dial string may contain any of the dial modifiers contained in the following section.
The D command without a dial string is usually used to switch from voice conversation to data
communication or to call a remote modem in leased-line operation mode.
En Command Echo
E0/E Disables command echo.
E1 Enables command echo. (Default)
Hn Hang Up
H0/H Goes on-hook. (Hangs up)
H1 Goes off-hook. (ready to dial)
In Identification
I0/I Report the product code.
I1 Report the hardware checksum.
I2 Report " ERROR".
I3 Report firmware revision.
I4 Report OEM defined identifier string.
I5 Report the country code parameter.
I6 Report modem data pump model and internal code revision.