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Appendix A. AT Commands and S-Registers
A-2 Express 3000 User Manual 61203153L2-20
Entering Text into the Command Line
All command lines must begin with the
AT
character set in either all
uppercase or all lowercase letters. After the
AT
attention code, the
command line may contain a single command or a series of com-
mands; however, AT commands
_L1
and
_L0
must be entered on a
separate line and followed by
Enter
. When entering a series of com-
mands, you may separate the individual commands with spaces for
readability. The maximum length for a command line is 40 characters.
After receiving a terminating character, the Express 3000 executes
each command line. The default terminating character is a carriage re-
turn (ASCII 013), but it can be changed by writing a different value to
register S3. Before transmitting the terminating character, you can edit
the command line by using the backspace character (ASCII 008) to
erase errors so the proper commands can be entered.
Entering AT Commands
To enter an AT command, type
AT
followed by the command; then,
press the
Enter
key (the AT Commands list begins on page A-4). For
example,
ATI1
returns the software version of the Express 3000 unit.
S-REGISTERS
You can change or view the Express 3000 configuration using the
S-registers (the S-registers list begins on page A-9).
Reading S-Registers
To read an S-register, type AT, the S-register number, a question mark,
and then press the
Enter
key. For example,
ATS0?
lets you view the
Auto Answer options.
To return an active call to the on-line state, enter
ATO
.