Helmholz 700-751-HSM11, Manual, Page: 50 / 99

50 Helmholz Modem 56k 4.1
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 attempts 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 specified 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 con-
nect 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 mes-
sage is displayed.
@
Waiting for silence: The modem waits at least five seconds for si-
lence in the line, before it executes the next character from the pa-
rameter string. If this five second silence can not be detected and
the abort period in the S7 registry has not been exceeded, the mo-
dem terminates the connection displaying the message:
NO ANSWER
.
If busy signal recognition was activated, the modem terminates the
connection displaying the message:
BUSY
.
If a response tone from the other modem is received during the
waiting period, a connection is established.