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BACKSPACE KEY
REPEATING A COMMAND: A/
NUMBERED COMMANDS
GROUP COMMANDS
The characters the AT command interpreter uses as end-of-
line, line feed, and backspace are set respectively by the S3,
S4, and S5 commands and can be changed.
The punctuation used in telephone numbers takes up space in
the buffer, as do blank characters used as spaces to help
increase readability.
Use the backspace key to change the command statement or
correct errors. The backspace key allows the cursor to be
moved back to the character(s) in error. The command can then
be retyped from that point.
Example: ATD5551211 has been typed. To change the last 1
to 2, press the backspace key once, type 2, and press return to
execute the command.
This command tells the TA to repeat the last command stored
in its buffer. The command is automatically executed without
any need to retype the command or press the return key.
Example: The ATD5551212 command has been executed, and
the phone is busy. To repeat the instruction type A/, but do not
use AT before this command, as AT would empty the buffer
and there would be no command to repeat.
Series of commands starting with the same letter are
distinguished by a number following the letter.
For example, the E0 command selects echo off, and E1 selects
echo on.
A group of commands can be typed in a single statement.
Pressing the RETURN key sends the entire command string to
the TA, which executes each command, in the order it appears
in the command statement, from left to right.
For example, the command statement ATQ0V0D5551212
means:
• AT
Attention
• Q
Allow status messages to be sent
• V
Select status
• D
Dial 555-1212
The TA executes the AT command followed by the Q, V, and
D commands. The TA returns the status message
corresponding to the last command on the line. If an error is
encountered in a command line, subsequent commands on the
line are ignored.
UTA220/UTA220k
AT Command Operation
8-3
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