Rose Electronics CrystalView DVI Plus - Manual (Page 28)

All Serial / Audio models install and connect in the same manor.
Transmitter serial/audio installation
Connect the Transmitter unit’s DB9F connector to the computer’s
DB9M Com port using a standard serial cable (DB9MF).
The Audio In connector on the Transmitter unit is a 3.5mm stereo audio
port.
Connect a standard audio cable (male to male) from the transmitter Audio in
to the computer’s audio out port.
Connect a standard audio cable (male to male) from the transmitter Audio
out to the computer’s audio in port.
Receiver serial/audio installation
Connect serial equipment’s serial cable directly to the DB9M connector on
the receiver unit.
Connect a microphone directly to the Audio in port on the receiver.
Connect a headset directly to the Audio out port on the receiver.