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86 536EX Chipset Developer’s Manual
Intel Confidential
S-Registers
S5 8
Backspace Character: S5 specifies the backspace character that is used to delete the last-
entered character. After receiving a backspace character, the modem sends three characters to
the DTE: a backspace character, a space character, and then another backspace character.
Range: 0–32, 127
Default: 8 (BS)
S6 2
Wait Before Blind Dialing: S6 specifies the amount of time that must elapse after the modem
goes off-hook before the modem starts dialing the first telephone number. The modem waits for
at least 2 seconds before dialing the first number, even if S6 is set for a value less than 2. S6 is
only used for result code type commands X0, X1, and X3 (that is, blind-dialing types of result
codes). Result code types X2 and X4 enable dial-tone detection and ignore the contents of S6.
Range: 2–255 seconds
Default: 2 seconds
S7 60
Wait for Carrier/Dial Tone: S7 specifies the length of time that the modem waits to detect the
remote modem carrier after dialing the telephone number. If the remote modem carrier is not
detected within the S7 time limit, the modem hangs up and sends a ‘NO CARRIER’ response
code to the DTE. If the remote modem carrier is detected, the modem goes into online data
mode and sends a ‘CONNECT’ message to the DTE.
S7 also specifies the time duration for the ‘@’ (wait for quiet answer) dial modifier.
Range: 1–255 seconds
Default: 60 seconds
S8 2
Pause Time for Dial Modifier: S8 specifies the length of time that the modem pauses during
the dialing process each time the ‘,’ dial modifier is detected in the dialing string.
Range: 0–255 seconds
Default: 2 seconds
S9 6
Carrier Detect Recovery Time: S9 specifies how long the remote modem carrier must be
present on the telephone line before the modem detects it and turns on DCD. The greater the
time duration, the less likely that a false carrier detection occurs due to noise on the telephone
line.
Range: 1–255 (1/10 of a second)
Default: 6 (equals 0.6 seconds)
S10 14
Lost Carrier Hang Up Delay: For modes V.32 and below, S10 specifies the length of time the
modem waits before hanging up after the loss of the remote modem carrier. This delay allows
for the temporary loss of the remote modem carrier without causing the local modem to hang
up.
S10 reports the time in 1/10 second units beyond 20 seconds. For example, when S10 = 0, the
wait time is 20 seconds. When S10 = 100, the wait time is 30 seconds.
In V.34 and V.90 modes, the modem automatically retries the connection for the time specified
in S10 (Plus the mode-specific base time) before hanging up. In V.34 mode, the base time is 20
seconds. In V.90 mode the base time is 45 seconds.
For all modes, the modem does not disconnect upon loss of the remote modem carrier if S10 is
255.
Range: 0–255 (1/10 of a second)
Default: 14 (equals 1.4 seconds plus the 20 second minimum)
S11 70
DTMF Dialing Speed: S11 specifies the duration of dual-tone multi-frequency (DTMF) dialing.
This register is not used for pulse dialing.
Range: 50–255 ms
Default: 70 ms
Table 26. S-Register Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.