User manual

AT COMMANDS: DATA MODEM 2-1
Chapter 2 AT COMMANDS:
DATA MODEM
Guidelines for Using AT Commands
The modem is programmed with AT commands from the data terminal equipment
(computer, PC or terminal) and thus also receives instructions to cover automatic
dialling. The communications or fax software (Voice Software as an option) will
carry out most of these operations for you, so that in general circumstances you do
not need to have a detailed understanding of the commands which are described
below.
The modem must be in Command mode before it can accept commands. In this
condition, all the characters sent from the computer are interpreted as commands
and, where appropriate, confirmed by a modem message on the screen. When a
connection is set up to a remote modem, the modem will switch to data mode and
transfer all the characters it receives to the other party.
The modem can be switched from an existing connection, back into the com-
mand mode, by using the Esc Sequence (+++), without breaking off the connec-
tion to the remote modem. In this status, any commands which are entered will not
be transferred to the remote modem.
The modem is activated by AT commands, the subsequent value of which will
modify the form of the command. Modem messages provide information on the
form of the commands.
In the Hayes Command Set, commands are entered by the character sequence
AT (at) and can also be entered as a list of commands with or without spaces be-
tween the individual commands. The “Backspace” key is used for deleting. Com-
mands can be entered in upper-case or lower-case. In the command mode, the
modem automatically recognizes data frames and data speed.
➮ AT commands can be transferred to the modem at the following data speeds:
57600, 38400, 19200, 14400, 9600, 4800, 2400, 1200, 600 and 300 bps
Examples of Command Syntax:
ATX1<CR>
ATQ0<CR>
ATDP12345<CR>
Individual commands ending with the <CR> Enter key, can be entered in a differ-
ent manner with the same effect, by inserting as many spaces as you need, to make
the command easier to visualise
ATX1QODP12345<CR> or:
AT X1 Q0 DP 12345<CR>
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