Section 4 – Camera Hardware
Page 51
filter wheel and relay adapter box. It is also the relay output for direct connection to many
popular telescopes’ “CCD” autoguiding port. (Note: This is not the same thing as the
telescope’s RS232 port that is commonly used to point and slew the telescope). The second
accessory port on the camera is labeled I2C AUX (“I squared C”) and is for future accessories.
Be sure to keep the static safe cap over this port to insure that you do not accidentally plug in an
accessory that is intended for the AO7/CFW8/SCOPE port. Plugging in the wrong accessory to
the I2C port could cause damage.
More than one accessory can be connected to the accessory ports by using multiple plug
adapters provided with the accessory.
4.7 Battery Operation
The ST-7XE, ST-8XE, ST-9XE, ST-10XE, ST-10XME and ST-2000XM can be operated off of
a 12 volt car or marine battery using a the optional 12V power supply or using a power inverter.
We have used the Radio Shack model 22-132A, 12 volt DC to 115 volt AC Portable Power
Inverter (140 watt) with good success. The camera draws 2.2 amps from the battery with this
inverter, which should enable an evening's operation from a single battery. If your camera has
the older two-stage cooling booster, it will, when connected, draw another 2 amps. We
recommend a separate battery for the camera; using your vehicle's battery with the engine
running may add undesirable readout noise, and using your vehicle's battery without the
engine running may result in a long walk home in the dark!
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