SBIG STF-8300 Manual
Appendix A – Connector and Cables
Power Jack
The Power Jack is used to supply 10.0 – 14.5 Volts DC at 3 amps to
the camera. The jack is locking and center-positive. The mating plug
is the locking model Switchcraft S760K with 0.218 inch outer diameter
and 0.080 inch inner diameter (5.5/2.0 mm).
Telescope Jack
The Telescope Jack is used to provide tracking signals to the tele-
scope drive. Viewed from outside the camera, looking in, it has the
following pin-out:
The Left, Down, Up and Right
signals are driven from optically
isolated photo transistors that
conduct when telescope movement
is desired. They can sink up to
25ma and can hold off up to 25V.
If what you are plugging into is
voltage based you’ll need an external pull-up resistor. The Common
signal is connected to the common on the four photo- transistors. The
Special signal is discussed below.
Jumper Options
By removing the back of the camera you’ll find two jumpers adjacent
to the Telescope Jack that have the following affect:
J9 Pin 1 to 2 – When in place
connects the Common signal to the
minus side of the power source,
effectively grounding the Common.
J9 Pin 3 to 4 – When in place makes
the raw positive power source (~12V)
available on the Special signal. You
can use this for powering an external
relay box. Do not connect to your telescope with this jumper in place
as you will damage the telescope or camera.
4
3
2
1
J9
Telescope
Jack
LED
31
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