0049-2702-XXX Alliance Series Modems – USER MANUAL
08/05/2010
Rev. A
Page 112 of 197
•
A telephone number to be dialed, or
•
A string consisting of a phone number and dialing modifiers
(e.g.,
T
,
P
and
;
).
An example of the
D
command is
AT D3331234
In response to this command, the ALX dials the telephone number 333-1234, and then waits for
a carrier tone from the distant modem (default wait time, 30 seconds). If the modem is able to
establish a call, it gives a CONNECT result code, indicating that it is on-line. If it cannot
connect, it issues a different result code, such as NO CARRIER, BUSY, or NO DIALTONE.
The characters that can be dialed are 0 through 9, A, B, C, D, # and * ; however, A, B, C, D, #
and * can be tone dialed only.
The dialing modifiers are listed in Table 4-2.
The dial command without a telephone number –
AT D
– causes the modem to pick up the
telephone line without dialing a number.
DS – Dial stored number
The
DS
command (
D
command with
S
modifier) instructs the ALX
to dial a phone number or dial string previously stored using the
&Z
command. They syntax is
DS=c
, where c specifies the phone cell (memory location) where the number to be dialed will be
stored. Up to 50 numbers may be stored in phone cells 0-49.
S=c
may be placed anywhere in
the dial string; for example,
AT D2345S=27
will dial 2345 and the number stored in phone cell
27. However, if the characters specified after
AT D
(2345 in this case) plus the contents of the
specified cell (contents of cell 27) exceed 50 characters, you will get an error message when you
try to dial.
H – Telephone switch hook
The
H
command (on-hook) is used to terminate a call. (On-hook
corresponds to off-line.)
H
may also be used to alternate between voice and data transmission
during the same call (if your communication software supports this capability).
The
H1
command (off-hook) activates the telephone line relay, causing a dial tone to be sent
(after a 2-second delay). For most purposes this command is not necessary, since the switch
hook is automatically activated when the modem originates or answers a call.
L – Link
The
L
dialing modifier is used to link a phone number specified for dialing to an
alternate (stored) phone number so the ALX will dial the alternate number if a connection cannot
be made to the primary number specified. You can link several phone numbers for sequential
dialing, or you can link the same phone number so the modem will automatically redial.
