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Chapter 6 - S-Registers
S15
Callback Time Delay
Unit: Seconds
Range: 10-255
Default: 20
Description: S15 defines the time delay between Callback attempts after initial passwords have
been exchanged between modems. Refer to Chapter 7 for Callback Security
information.
S16
Callback Attempts
Unit: 1 Attempt
Range: 1-255
Default: 4
Description: S16 defines the number of attempts allowed after initial passwords have been
exchanged between modems.
S17
Changing Break Time
Unit: 10 mSec.
Range: 0-2.5 sec
Default: 250
Description: S17 defines the break time (space) sent to the local PC. The default is set for a 25 to
250 mSec break. The break time can be changed in 10 mSec increments by
increasing or decreasing the value of S17.
S24
PBX/CBX Disconnect Drop Time for DSR/CTS/CD
Unit: 50 mSec.
Range: 0-255
Default: 20
Description: Some PBX and CBX phone systems require the modem’s DSR, CTS, and/or CD
signal(s) to behave in a certain manner when calls are disconnected. The modem’s
&R, &S, and &C commands cause the modem to drop these signal(s) for a specified
time period upon disconnect, and then bring the signal(s) up again. S24 defines the
length of time that the signals drop. The default setting of 20 results in a one second
drop time, which is what most PBX/CBX systems with this requirement need.
S25
DTR Dropout Time
Unit: 100 mSec.
Range: 0, 1 through 255
Default: 0
Description: S25 defines the amount of time that DTR must be dropped before the modem
disconnects. Typically, a disconnect occurs when DTR is dropped for 50
milliseconds or more. This dropout time can be increased, up to a maximum of 25.5
seconds. The S25 unit value for zero is the default value of 50 mSec. For values
from 1 through 255, the unit value is 100 mSec.