52
ISDN TA/V
11.4.2 C
OMBINING
C
OMMANDS
A command line can contain a maximum of 40 characters in it, and may be
constructed of a combination of commands. You can use spaces as fillers to
make the commands easier to read; the ISDN TA/V ignores these fillers and
they are not counted among the characters which make up the command
string.
Because the commands are always enacted in the order that they were
entered, not all commands can form part of the same command line. For
example, there are a number of commands within the AT language that have
to be placed at the end of a command string (such as a dial command) and
can therefore not form part of a string in which there is a similar command.
11.4.3 W
AITING FOR A
R
ESPONSE
The speed, or slowness with which you type a command line is of no
significance. However, you must wait for a response from the ISDN TA/V
between typing the terminator character (normally a
<CR>
) and starting to
type a new command line. Commands which take a long time to action, such
as a dialing string or an answer command, will be abandoned if a character is
sent from the computer to the ISDN TA/V before the command has been
completed.
The type of ISDN TA/V response is dependent on the command issued, and
is displayed on your computer screen below the command line to which it
refers. Most command lines get an immediate response which may simply
be
OK
when all the commands on a command line have been executed.
Sometimes responses are delayed, and there may be a number of responses
to a single command.
If a command is not recognised by your ISDN TA/V (if its numerical value
is out of the permitted range), or if actioning a command would cause a
malfunction of some sort, the ISDN TA/V will respond with
ERROR
and
abandon the command line.
ERROR
is an example of a response that is also
displayed on your ISDN TA/V’s front-panel LCD.
