User`s manual

U.S. Robotics I-modem Command Reference
Appendix A: Alphabetic Command Summary • Page A-13
&Bn Set the serial port rate to variable or Þxed.
Note The serial port rate must be equal to or higher than the &Nn rate.
&B0 Variable: The serial port rate adapts to match the speed of the connection.
&B1 Fixed: The I-modem always communicates with your computer at the rate
at which you have set, regard-less of the connection rate.
&B2 When answering calls, use the Þxed rate for ARQ calls and variable rates
for non-ARQ calls.
&Cn Control how the I-modem sends a Carrier Detect (CD) signal to your computer.
&C0 CD always ON, even if the I-modem is not on line.
&C1 Normal operations. The I-modem sends a CD signal when it connects with
another modem and drops the CD when it disconnects.
&Dn Control how the I-modem sends Data Terminal Ready (DTR) signals.
&D0 DTR is always ON.