USRobotics 33600, x2/56K user manual Sets the number of seconds the modem

S6	!	Sets the number of seconds the modem
		waits before dialing. If Xn is set to X2 or X4,
		the modem ignores this register and dials as
		soon as it detects a dial tone (fast dials). The
		range of acceptable values is country-
		dependent.
S7	60	Sets the number of seconds the modem
		waits for a carrier. May be set for much
		longer duration if, for example, the modem is
		originating an international connection.
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 sig-
		nal.
S10	7	Sets the duration, in tenths of a second, that
		the modem waits after loss of carrier before
		hanging up. This guard time allows the
		modem to distinguish between a line hit, or
		other disturbances that momentarily break
		the connection, from a true disconnect (hang
		up) by the remote modem.

While we don’t recommend connecting the modem to a line with call waiting, if you have it, you may wish to adjust this setting upward to prevent the modem from misinterpreting the second call signal as a disconnect by the remote modem. A better alternative is to ask your phone company how to temporarily disable call waiting (usually *70W). For example: ATDT *70W phonenumber.

NOTE: If you set S10 = 255, the modem will not hang up when carrier is lost. Dropping DTR hangs up the modem. This possibility is country-dependent.

S11	!	Sets the duration and spacing, in milli-
		seconds, for tone dialing. The range of
		acceptable values is country-dependent.

Sportster Winmodem 33600 & x2/56K - User's manual 47