INSYS Modem 336/56k 4.1 (UL)
AT
Command Set
Command
Description
ATD<n>
Dial
The modem goes off-hook and dials according to the dialing string transmitted via the
ATD
command. After it dialed, the modem attempts to establish a connection. If the
ATD
command was performed without a dialing string, the modem goes off-hook and at-
tempts to connect to the other modem (without dialing). The behavior of the modem
depends on the activation of the line current recognition (see
ATX
command).
The execution of the
ATD
command also depends on when the last dialing attempt was
performed.
In the mode
AT+FCLASS=0
, the modem acts like a data modem. It attempts to connect
to another data modem. This attempt is repeated until the waiting period that was speci-
fied in the S7 registry has expired.
If this period is exceeded, the modem hangs up and the following error message appears:
NO CARRIER
.
In the mode FCLASS=1 or =2, the modem acts as a fax modem. It attempts to connect to
another fax or fax modem. (The modem goes into receive status HDLC V.21 channel 2, as
if the command
AT+FRH
had been executed.)
The following characters may be transmitted as parameters (brackets, punctuation
marks, spaces and semicolons are ignored):
0 to 9
The digits from 0 to 9
*
The asterisk: Only for tone dialing
#
The hash: Only for tone dialing
A-D
The inband signaling characters A, B, C, D
P
Pulse dialing mandatory: Pulse or tone dialing is required according to the
region.
T
Tone dialing mandatory: Pulse or tone dialing is required according to the
region.
W
Wait for dialing tone: The modem waits for the dialing tone before it
starts to dial. If no dialing tone was detected within the period specified
in the S6 registry, the modem hangs up and an error message is dis-
played.
@
Waiting for silence: The modem waits at least five seconds for silence in
the line, before it executes the next character from the parameter string.
If this five second silence can not be detected and the abort period in the
S7 registry has not been exceeded, the modem terminates the connection
displaying the message:
NO ANSWER
.
If busy signal recognition was activated, the modem terminates the con-
nection displaying the message:
BUSY
.
If a response tone from the other modem is received during the waiting
period, a connection is established.
July 06
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