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AT Command Set and S-Registers
Table 4-2. S-Register Reference (1 of 6)
S-Register Description
S0= n
Auto-Answer Ring Number
This S-Register determines the number of rings the modem
will count before automatically answering a call. A ring count
of 0 will disable the auto answer feature.
n = 0–255. Factory setting is 0 (disables auto-answer).
S1
Ring Count
This S-Register reports the number of rings detected by the
modem. This register is cleared to zero if no rings are
detected within 8 seconds. Valid ring counts reported range
from 0 to 255.
S2= n
AT Escape Character
This S-Register determines the ASCII value used for an
escape sequence (+++).
Accepts an ASCII value from 0 to 127. Any value greater
than 127 will disable the escape sequence.
Factory setting is 43, an ASCII + character.
S3= n
Carriage Return Character
This S-Register determines the ASCII value used as the
carriage return (Enter key).
Accepts an ASCII value from 0 to127.
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.
Accepts an ASCII value from 0 to 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).
Accepts an ASCII value from 0 to 32, and 127.
Factory setting is 08, an ASCII backspace character.
4-20
Issue 1 November 1994
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