4. S-Registers
The S-Registers are used to store modem configuration parameters, display modem status, and initiate
modem test and diagnostic functions. In order to invoke commands to change or display the contents of
the S-Registers, you must first access the modem command mode as described in Section 2. Note the
following:
·
View Status Screen: To display the modem status screen, which lists the current values assigned to
most S-Registers, type ATL6 and press [Enter].
·
View S-Register Value: To display the value currently assigned to a specific S-Register, type
ATSr? and press [Enter] (Where r is the desired S-Register).
·
Change S-Register Value: To change the value assigned to an S-Register, type ATSr=n and press
[Enter] (Where r is the desired S-Register, and n is the desired value).
Register Range Default Function
S00 0 - 255 0 Auto Answer. Sets the number of rings that will elapse before the modem answers in
Auto Answer Mode. When set to 0, Auto Answer is disabled.
S01 0 - 255 0 Ring Count. Counts the number of rings that
have occurred.
S02 0 - 127 43 Escape Character Code. Stores the ASCII decimal code for the escape code character.
The default value of 43, defines the escape code character as "+" (plus sign).
S03 0 - 127 13 Carriage Return Character. Stores the ASCII code for the Carriage Return character.
The default value is 013 (normal carriage return).
S04 0 - 127 10 Line Feed Character. Stores the ASCII decimal code for the Line Feed character. The
default value is 010 (normal line feed).
S05 0 - 127 8 Backspace Character. Stores the ASCII decimal code for the Backspace character.
The default value is 008 (normal backspace character).
S06 2 - 255 2 Wait for Dial Tone. Sets the amount of time (in seconds) that the modem will wait
between going off-hook and beginning dialing.
S07 1 - 255 45 Wait for Carrier. Sets the number of seconds the modem will wait for a carrier signal
from a remote modem. If a carrier is not received, the modem will hang-up and send
the NO CARRIER message. Often used to select a longer duration when the modem
is originating an international connection.
S08 0 - 255 2 Pause Time. Determines the duration (in seconds) for the pause that is generated
when the pause character (,) is inserted into a dialing command line.
S09 1 - 225 6 Carrier Detect Response Time. Determines the length of time (in tenths of a second)
required for the modem to recognize the incoming carrier signal from the remote
modem, and turn on the DCD.
S10 1 - 255 7 Carrier Loss Disconnect Delay Time. Sets the length of time (in 100 Ms increments)
that the modem will wait after loss of carrier before hanging up. If this value is set
lower than the value contained in S09, a loss of carrier will always result in
disconnection.
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