User`s guide

56K Professional Message Modem68
Register Default Function
S8 2 Sets the duration, in seconds, for the pause (,) option
in the Dial command.
S9 6 Sets the required duration, in tenths of a second, of
the remote modem’s carrier signal before recognition
by the U.S. Robotics modem.
S10 14 Sets the duration, in tenths of a second, that the
modem waits to hang up after loss of carrier. This
guard time allows the modem to distinguish between
a line disturbance from a true disconnect (hang up)
by the remote modem.
Note:
If you set S10 = 255, the modem will not hang
up when carrier is lost. Dropping DTR hangs up the
modem.
S11 70 Sets the duration and spacing, in milliseconds, for
tone dialling.
S12 50 Sets the duration, in fiftieths of a second, of the guard
time for the escape code sequence (+++).