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AT Command Set and S-Registers
14-153910-A2-GN32-40 September 1998
S-Register Format
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
In Table 14-3, the value for n is listed in the S-Register column, and the value for r is listed in the
Description column.
Table 14-3
(1 of 13)
391x Series S-Registers
S-Register
Description
DCP LCD
Command
Sequence
S0 Auto-Answer Ring Number
1
. Register determines 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. The factory setting is 1.
Configure\Edit\
Line Dialer
S2 AT Escape Character. Register 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. The factory setting is 43
(+ key).
Configure\Edit\
DTE Dialer
S3 Carriage Return Character. Register determines ASCII value used as
the carriage return (Return key). This character is used to end
command lines and result codes.
Enter a value from 0 to 127 for the command end character. The
factory setting is 13 (carriage return key).
Configure\Edit\
DTE Dialer
S4 Line Feed Character. Register determines ASCII value used as the
line feed character.
Enter a value from 0–127 for the line feed character. The factory
setting is 10 (ASCII carriage return or line feed).
Configure\Edit\
DTE Dialer
1
The range of allowable values may be restricted in some countries.