US Robotics Courier V.Everything - Serial Ports; The EIA-232 Interface

Technical Information A-5
Serial Ports
Most computers provide a DB-25 or DB-9 port that conforms to the
EIA-232 standard. If you are connecting your Courier V.Everything
to a Macintosh computer, see the section For Macintosh Computers.
The EIA-232 Interface
The Courier V.Everything’s serial port is factory set to signal
according to the EIA-232 standard:
Figure A.1 Signals at your Courier's Serial Port.