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COMSPHERE 3821Plus Modem
4-16 February 1998 3821-A2-GB20-30
S-Register List
S-registers affect the operating parameters of the
3821Plus modem. These registers are applicable only
when the DTE Dialer Type configuration option is set for
AT. (See &Mn and &Qn commands.)
S-registers can be displayed and/or modified when the
modem is in Command mode. To display the value of an
S-register, issue the following command:
TYPE: AT S n?
Where: n is the register number.
PRESS: Enter
To modify the value of an S-register, issue the
following command:
TYPE: AT S n=r
Where: n is the register number, and r is the new
value.
PRESS: Enter
Table 4-2 lists S-registers supported by the 3821Plus.
Not all S-register values are valid in all countries. See
Appendix H.
NOTE
In some countries, the range of
allowable values of some
S-registers is restricted. If the DTE
attempts to enter a restricted
value, the modem answers OK,
but it sets the register to the
nearest allowable value. The DTE
can check the actual value of the
register with the S
n
? command.
Table 4-2
(1 of 10)
3821
Plus
S-Registers
S0 – Auto-Answer Ring Number
Determines the number of rings the modem will count before automatically answering a call.
Enter zero (0) if you do not want the modem to automatically answer any calls. Otherwise, enter a value from 1–255 for
the number of rings to count before answering. Note that if disabled, the modem can only answer with an ATA command.
The factory setting is 1.
NOTE: The default and permitted settings of this option are country-dependent. See Appendix H.
S2 – AT Escape Character
Determines ASCII value used for escape sequence (+++) to enter Command mode from Data mode.
Enter a value from 0 to 127 for the escape character. Any value greater than 127 causes the modem to disable the
escape sequence. When the escape sequence is disabled, the modem cannot return to Command mode until the call is
disconnected.
Factory setting is 43 (ASCII + key).
S3 – Carriage Return Character
Determines ASCII value used as the carriage return (Enter key). This character is used to end command lines and result
codes.
Enter a value from 0 to 127 for the command end character.
Factory setting is 13 (ASCII carriage return).
NOTE: The &W command used to save this change must be on a separate line. This ensures both that the change is
intentional, and that the DTE can enter the new character.