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MODEM 325 AND MODEM 325 CARD
6.3.2 O
C
NLINE
OMMAND
This mode is entered from the data mode by issuing the escape command. The data communication link
remains established but data transmission is suspended. The modem will now accept commands as it
does in the offline command mode.
6.3.3 D
M
ATA
ODE
The modem goes to data mode (online) after it successfully connects with a compatible modem. In data
mode, the modem sends and receives data, but will not accept or execute command instructions.
Example: The modem is in the command state. The D command and phone number are used to dial a
remote modem. The local modem waits to receive a signal from the remote modem. The remote
modem acknowledges the call by sending a carrier signal. When the local modem receives this carrier, it
leaves the command state and goes online in the data mode. At this time, both modems are using the
telephone line and a communication link is established.
In online command mode, the modem can have its own command set altered or use remote
configuration to change a remote modem's command set.
6.4 Sending Commands to the Modem
When the computer, modem, and monitor are on, an instruction can be sent to the modem telling it what
function or activity to perform. The instruction, called a command statement, command string, or just
command, is typed using the computer keyboard. The command statement temporarily resides in a
section of memory called the command buffer.
Each command statement is made up of characters, numbers, and such keyboard symbols as the & and
% signs. Commands must be written in a specific form so that the modem recognizes and follows the
instruction.
6.4.1 C
C
REATING A
OMMAND
Create a command statement using the following steps:
• Type AT. This is the Attention Code telling the unit a command statement follows.
• Type the command.
• Press the return key to "Enter" or send the command statement to the modem.
Here is an example of a command statement using the dial command (D).
ATD555-1212
This command statement can be read as: "Attention: Dial 555-1212."
Another example is ATZ. This means "Attention: Execute the Z command."
After you enter a command line, the modem returns a response indicating whether the command was
accepted or giving the data requested by the command statement.
5 2
M
ODE
S
TATEMENT
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