User`s manual

U.S. Robotics I-modem Command Reference
Controlling EIA-232 Signaling • Page 6-2
&Dn Tell the I-modem how to deal with the DTR signal.
&D0 Operate as though the DTR signal is always ON.
&D1 Use a change in the DTR signal to enter Command mode
. Most communi-
cations software packages have a method for toggling DTRÑrefer to your
softwareÕs manual for details.
&D1 functions similarly to the escape code (+++). Return online with the
On command, or hang up with the ATH command.
&D2 Respond normally to the DTR signal. The I-modem will not accept com-
mands until your computer sends a DTR signal. The call will end when the
DTR signal is dropped.
To change the DTR recognition time, set S-re
gister 25. (See Appendix A,
Alphabetic Command Summary.)
Data Set Ready
Data Set is another name for the I-modem. Under normal conditions, the I-modem sends a
Data Set Ready (DSR) signal to your computer when it is ready to send and receive data.