User Manual

Table Of Contents
36
Modem AT Commands
Appendix A
Mini PCI User’s Guide Xircom Inc
S4 Response Formatting Character
This register contains the ASCII value of the line feed character. The factory default value is
10
. You can
set register
S4
to any value between 0 and 127. The modem uses a line feed character in command mode
when it responds to the computer.
S5 Command Line Editing Character
This register contains the ASCII value of the backspace character and is applicable to asynchronous
transmissions only. The factory default value is
8
. You can set register
S5
to any value between 0 and 32,
or to 127. The modem will not recognize the backspace character if it is set to a value greater than ASCII
32.
S6 Wait Before Blind Dialing
This register determines how long the modem waits after going off-hook before dialing the first digit.
The wait must be at least 2 seconds. Register S6 can be set to any value between 2 and 65 seconds. The
default is
2 seconds
. The value of the W dial modifier will override the value in register S6. This operation,
however, may be affected by some ATX options according to country restrictions. There may be country-
specific defaults and limits.
S7 Connection Completion Time-Out
This register determines the number of seconds the originating modem waits for a carrier signal from the
answering modem before hanging up. The timer is started when the modem finishes dialing (originate), or
goes off-hook (answer). In originate mode, the timer is reset upon detection of an answer tone if allowed by
country restriction. The timer also specifies the wait for silence time with the @ dial modifier (in seconds).
S7 is not associated with the W dial modifier. Register
S7
can be set at from 1 to 255 seconds with a default
of
50 seconds
. There may be country-specific defaults and limits.
S8 Duration of Pause for Comma Dial Modifier
This register determines the number of seconds to pause for each comma (
,
) in a dial string or command
line. The default is
2 seconds
, but any value from zero to 65 is acceptable. Defaults and limits are country-
specific.
S10 Delay Between Lost Carrier/Hang Up
This register specifies the time (in tenths of a second) that the modem waits after carrier loss before
hanging up. The default is
20
(2.0 seconds). Register
S10
will accept a value ranging from 1 to 254 in
tenths of a second (0.1 to 25.4 seconds). There may be country-specific defaults and limits.
S11 DTMF Tone Duration
This register determines the "touch tone" dialing speed which is prefixed for each country. The value can
range from 50 to 150 milliseconds. The default is
95 milliseconds
. The value of register
S11
has no effect
on pulse dialing. There may be country-specific defaults and limits.
S12 Escape Guard Time
This register sets the value (in 20 ms increments) of the required pause after the escape sequence. Range
is 0 = 255, default is 50 units of 0.02 seconds each, or one second.
S28 V.34 Modulation Enable/Disable
This register enables or disables V.34 modulation. Default setting is 1, valid values are 0 or 1. A value of
zero disables V.34 modulation. Any other value in the range enables it.