S20-Sync Mode Underrun Fill Character; S21-V.24/General Bit-Mapped Options Status; S29-Flash Dial Modifier Duration; S30-Inactivity Timer - US Robotics 56 K SOFTMODEM - COMMAND REFERENCE REV 1 Command Reference Manual

S20—Sync Mode Underrun Fill Character
S21—V.24/General Bit-Mapped Options Status
Bit
0 Set by &J<value> command but other-
wise ignored.
1 Sync mode underrun action.
3—4 DTR behavior (&D<dial string>).
5 DCD behavior (&C<value>).
6 DSR behavior (&S<value>).
7 Long space disconnect (Y<value>).
S29—Flash Dial Modifier Duration
S30—Inactivity Timer
Specifies the character that will be sent in sync mode when there is not enough
valid data available.
Range: 0 to 255.
Default: 0.
S21 indicates the status of command options. Only bits 3, 4, and 5 are used; they
are read-only.
Default: 48 (30h) (00110000b).
•
Table 5-4: Register S21 Bits
Description
Set the duration of the hook flash (!).
Range: 0—255.
Default: 50.
Base Unit: 10 milliseconds.
This register specifies the length of time in minutes that the modem will wait
before disconnecting when no data is sent or received. This function is only
applicable to buffer mode.
Range: 0—255.
Default: 0 (disabled).
Command Reference
Value
0 = J0 (default). 1 = J1.
0 = Send underrun fill character (20) (default). 1
= Repeat last valid character.
0 = &D0 selected. 1 = &D1 selected. 2 = &D2
selected (default). 3 = &D3 selected.
0 = &C0 selected. 1 = &C1 selected (default).
0 = &S0 selected (default). 1 = &S1 selected.
0 = Y0 (default). 1 = Y1.
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