Hall Research VSA-31-SP-W - Manual (Page 8)

Model VSA-31-SP
6
As seen in the above diagrams, the connection between the receiver and
the projector could be comprised of VGA, S-Video, and RS232. These
cables are not supplied and must be purchased separately.
Please note that most projectors use a unique and non-standard Serial
input connector, therefore you need to build your cable according to
the pin out provided be the projector manufacturer or purchase a
cable from them.
If you will be making your own cable, the VSA-31-SP receiver has the
following RS-232 pin out:
Connector on VSA-31-SP: DB9-Male
Transmit: Pin 3
Receive: Pin 2
Ground: Pin 5
Note on video signals that go to the Projector
When you select either of the 2 VGA inputs (Source 1 or
Source 2), the VGA output to the projector has the selected
signal and the S-Video output is blanked out. Conversely, if
the input is Composite Video or S-Video (Source 3), only the
S-Video output to the projector will have a signal. This means
that it is possible to use the projector’s auto-detect mode to
switch between video inputs and not even connect the serial
port to the projector. However in doing so, you will not be
able to use the on/off button on the sender to control the
projector, and you will still have to rely on the projectors
remote to turn the projector on and off.