Motorola and V.32bis - Manual (Page 101)

Using the AT Automatic Calling Interface 5-9
Using the
AT
A
C
U
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 num-
ber 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 com-
mand 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).
Format: AT
*
RDn<CR>
Settings: n, Specifies S-Register
Format: ATSn?<CR>