AT&T DataPort PCX Modem User Manual page 48

AT Commands and S-Registers
Table B-1. AT Command and S-Register List (9 of 21)
AT Command/
S-Register
S10= n
S11= n
S12= n
S18= n
S25= n
Description
NO CARRIER DISCONNECT
255 = Disable
Sets the amount of time the DataPort PCX modem
will wait before disconnecting when no carrier signal
is detected. Accepts a value from 0 to 254 in
0.1 second increments. S10 must be set to a value
higher than the value of S9 or the modem will
disconnect before it recognizes the carrier.
Factory setting is 14 (1.4 seconds).
DTMF TONE ON TIMER
Sets the duration of a DTMF tone (touch-tone).
Accepts a value from 50 to 255 milliseconds. A value
less than 50 defaults to 50 milliseconds.
Factory setting is 95 milliseconds.
ESCAPE GUARD TIME
Sets the duration of the pause required before and
after an escape sequence (+++) for it to be treated as
an escape sequence and not data. Accepts a value
from 0 to 255 in 20 millisecond increments.
Factory setting is 50 (1 second).
TEST TIMEOUT
Sets the duration of any test initiated by the
&T command. If S18=0, a test runs indefinitely
unless manually canceled (see &T0). Accepts a value
of 0 for Disable, or from 1 to 255 seconds.
Factory setting is 0 (Disable).
DELAY TO DTR
Sets the length of time that the modem will ignore
DTR before taking the action specified by &D n . S25
specifies duration in seconds for synchronous modes
and 10-millisecond increments for other modes.
Accepts a value from 0 to 255.
Factory setting is 5.
Issue 2 July 1995
B-9