AT Command Set and S-Registers
4-20
Issue 2 May 1995
Table 4-2. S-Register Reference (1 of 5)
S-Register
Description
S0=
n
AUTO-ANSWER RING NUMBER
This S-Register determines the number of rings the modem
counts before automatically answering a call. A ring count of
0 disables the auto answer feature.
n = 0–255.
Factory setting is 1 ring.
S2=
n
AT ESCAPE CHARACTER
This S-Register determines the ASCII value used for an
escape sequence (+++).
n = 0–127.
Values greater than 127 disable the escape sequence.
Factory setting is 43, the ASCII + character.
S3=
n
CARRIAGE RETURN CHARACTER
This S-Register determines the ASCII value used as the
carriage return (Enter key). This character is used in
asynchronous operation only.
n = 0–127.
Factory setting is 13, an ASCII carriage return.
S4=
n
LINE FEED CHARACTER
This S-Register determines the ASCII value used as the line
feed character. This character is used in asynchronous
operation only.
n = 0–127.
Factory setting is 10, an ASCII line feed character.
S5=
n
BACKSPACE CHARACTER
This S-Register determines the ASCII value used as the
backspace (Backspace key). This character is used in
asynchronous operation only.
n = 0–127. (The modem will not recognize a backspace
character greater than 32.)
Factory setting is 08, an ASCII backspace character.
