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A parameter after a command (0, 1, 2, etc.) tells the modem which option to use. If you do not specify a
parameter, the modem assumes the 0 (zero) option. E, for example, is the same as E0. You can issue
several commands on a single line (a command string) as long as the line does not exceed 40 characters.
Note: Each character in a command counts towards the 40 character command line maximum. While Q1
is a single command, it counts as two characters in the command line.
Each command has a valid range of parameters; for example, &S can have only 0 or 1 as a parameter. Valid
commands always generate an OK result code, and a few generate an additional response, such as a list of
parameters. An invalid command, such as &S3, which has a parameter outside the valid range, generates
an ERROR result code. Most commands have a default parameter that is enabled when the modem is
turned on or reset with the ATZ or AT&F command. Factory defaults are stored in read-only memory
(ROM), and cannot be changed. User-defined defaults can be stored in nonvolatile random-access
memory (NVRAM), and can be changed or deleted at will.
Command Editing
Always begin a command with the letters AT . Enter the entire command string in upper or lower case, but
do not cannot mix cases within the command string. The AT command is not executed until you press the
E
NTER
characters once they are typed. If your keyboard has no B
character recognized by the modem as B
Press C
command buffer. The effect is the same as backspacing the command, only quicker.
The modem stores characters entered in a command in it's command buffer until they are executed by
pressing E
count towards the 40 character command line maximum. You may use spaces for increased readability
when typing a command. Spaces are not stored in the command buffer, and they do not count towards the
40 character command line maximum. Special characters, such as hyphens and parentheses, are not
allowed.
If you exceed the 40-character limit or type invalid characters, the command buffer is automatically erased
and an ERROR message displays. You should retype the command within the 40-character limit, using
only the allowed characters.
The commands in this chapter are organized by function. A brief summary follows.
CommPlete Communications Server
key. Use the B
key to erase the previous command character. It will not erase the AT
ACKSPACE
+X to cancel an entire command that has been typed but not yet executed. This also clears the
TRL
. The command buffer's capacity is 40 characters. The attention characters (AT) do not
NTER
key, use C
ACKSPACE
to any other ASCII character by changing register S5.)
ACKSPACE
3 AT Commands
+H. (You can change the
TRL
13
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