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Chapter 7: AT Commands and Registers
7.1.1.1
Issuing AT Commands at any Speed
You can enter AT commands at any supported serial-port speed up to
115,200 bps. Your modem automatically adjusts to the connection and
command speeds (autobauds) up to 19,200 bps. Any time after you enter
an AT at any speed up to 19,200 bps, you can enter commands at a new
serial-port speed. If you enter a command at 38,400, 57,600, or 115,200
bps, the serial port locks at that speed. The serial-port default speed is
38,400 bps.
To unlock the serial-port speed and change to another speed:
•
Enter an AT$Bn command (where n is any supported serial-port
speed), or
•
type AT%U to unlock the serial-port speed, then enter an AT at the
new speed, or
•
with &D2, or &D3 set, lower then raise DTR.
7.2
COMMANDS
This section lists the modem AT commands in alphabetical order. A
command argument printed in bold is the default setting.
In most cases, you will not need to change the default setting.
NOTE
A/
Repeat Last Command
Re-executes the last command immediately. The A/ command is
not preceded by "AT" and not followed by <Enter>.
A
Answer
Forces the modem to go off hook in answer mode, regardless of
the value of register S0.
If result codes are enabled, your modem returns the result code
RING (long form) or 2 (short form) when it receives a call.
7-2
CSMIM-T1 Hardware Installation Guide
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