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Using the AT Automatic Calling Interface 5-9
Using the
AT ACU
AT
*
RD, Redial Last Number
You may redial a failed call n times using the AT
*
RD command. The modem
redials a call until a successful connection is made, or until the call has been
attempted n times. The AT
*
RD command causes the modem to redial the last
number dialed. So if an initial call fails, and the telephone number is linked to
another number, the modem redials the linked telephone number.
S-Registers
S-registers are memory locations for storing specific configuration and operating
parameters. S-registers typically contain timing, counting, ASCII characters, or
command option values. While communications software generally insulates you
from the need to alter S-register settings, you may want to reconfigure or read the
contents of an S-register. This section describes how to read and change S-Register
values.
This section is in two parts:
• The first part describes the AT commands used to display and change
S-Register values.
• The second part describes S-Registers used by the modem.
Any S-Register that is not stored in memory is reset to its default value when you:
• Power up the modem
• Load a new Option Set
• Reinitialize memory
Displaying and Changing S-Register Values
Display S-Register Value (ATSn?)
This command displays the value of S-Register n, as stored in volatile memory.
If a “?” appears in the command string anywhere other than immediately following
the S-Register number, the command displays the value of the last S-Register
selected.
If you try to read the value of an unused S-Register, the modem displays OK.
Settings:
0, 1 Redial last number one time.
n (The maximum number of redials allowed is country-specific. See the
326X Series Modem Country-Specific Guide
for more details).
Fo rm a t:
AT
*
RDn<CR>
Settings:
n, Specifies S-Register
Fo rm a t:
AT S
n
?<CR>