User`s manual

U.S. Robotics I-modem Command Reference
Controlling EIA-232 Signaling • Page 6-3
Do not change the default setting of &S0 unless you know that your installation requires a
different setting. Few communications programs, if any, will require the I-modem to con-
trol DSR (&S1).
&Sn Control how the I-modem sends the DSR signal.
&S0 Send the DSR signal at all times. Default.
&S1 When originating a call, send the DSR signal after dialing when the
I-modem detects the remote analog deviceÕs answer tone. When answering
a call, send DSR after the I-modem sends its answer tone.
&S2 Use this option for specialized equipment such as automatic callback units.
After sending Carrier Detect (CD), send a pulsed DSR signal, followed by
a Clear to Send (CTS) signal.
&S3 Same as &S2, but do not send the CTS signal.
&S4 Send a DSR signal to your computer at the same time the I-modem sends
the CD signal.
&S5 Send DSR normally (with CTS) after sending CD.