USRobotics V.34 - Manual (Page 39)

COURIER HIGH SPEED MODEMS
4-2 Data Mode Operations
3. All commands except A/, A> and +++ are preceded by
the AT ( attention) prefix and are executed with the
Enter/Carriage Return key (<Enter>).
4. Command length = 60 characters maximum. The
modem doesn't count the AT prefix, Carriage Return
character, or spaces. It counts (but doesn't act on)
punctuation such as hyphens and parentheses.
5. A missing numeric parameter is assumed to be zero, as
in the command to hang up: ATH <Enter> is the
equivalent of ATH0 <Enter>.
Example (spaces are not required, but are added here for
readability):
AT &K3 X2 DT 071 312 1234 <Enter>
AT Attention; a command follows.
&K3 Disable MNP5 data compression; use only
V.42
bis compression.
X2 Use the X2 result code subset.
DT Dial the following number using tone dialing.
<Enter> Execute the commands.
This chapter groups related commands into the following
categories.
• Basic Commands
• Dialing/Answering
Dialing
Dial Options
Cancel Dialing
Store Phone Numbers
Redialing
Answer Mode
Auto Answer
Hanging Up
• Setting/Using Defaults
Customizing NVRAM
Resetting the Modem