20
C
OMMAND
L
INE
B
UFFER
The modem places each command issued into a command buffer that holds up to 160 characters.
The modem does not place the AT, carriage return, or line feed characters into the buffer, so the
buffer’s 160 spaces only hold actual command characters (and any spaces between them). If a
command line contains more than 160 characters, the modem stops showing what you type on the
screen and it ignores further commands.
R
ESULT
C
ODES
After the modem receives a command, it returns a result code. The most common result code is
OK
,
which means the modem understood your command.
Result codes can be represented by English words (verbose mode) or with numbers (numeric
mode). The Result Code command
ATV
tells the modem whether to respond with verbose or
numeric result codes. Words are preceded and followed by a carriage return and line feed
characters. Numbers are followed by a carriage return.
For more information, refer to the Result Codes list.
