Equinox Systems GEMINI Instrukcja Użytkownika Pobierz pdf (Strona 46)

Gemini Users Manual 41

version does not directly support autoguiders with TTL output, but the newer version

does.

Gemini contains a separate Autoguider port – a 6-pin modular RJ-11 socket located

below the 15-pin connector to the left. It contains a common pin, four directional pins

and one pin that is controlled by the alarm signal that can be used for shutter control. The

common pin of the RJ-11 modular connector is connected to +5V on the older version of

Gemini, and GND on the newer version. The 4 directional inputs must be connected to

the common pin to be active (they are active at High potentials on the older version of

Gemini, and at Low potentials on the newer version). Simultaneously activating opposing

directional signals (DEC+ and DEC- or RA+ and RA-) will be ignored and displayed as

“Autoguider Error.”

Note: The autoguider port is only active in the Photographic Mode and All-

Speeds Mode of the Gemini system. Selecting the Visual Mode disables Guiding

and therefore the Autoguider Port.

4.2.2 Manual Guiding

Manual guiding is usually done using an eyepiece with an illuminated reticle attached to

an off-axis guider or separate guidescope. You center a star (or the object being

photographed) in the reticle and use the buttons on the Deluxe Hand Controller to apply

guiding corrections to keep the star on the reticle throughout the duration of the exposure.

Rather than using the Deluxe Hand Controller, you can instead guide with a Losmandy

Standard Hand Controller plugged into the autoguider port. The LED of the Standard

Hand Controller will not normally be lit, but will light up anytime the alarm sounds.

Using a Standard Hand Controller in the autoguider port has a big advantage for manual

guiding, in that accidentally pressing opposite directional buttons simultaneously will not

result in movement at centering speed, as happens with the Hand Controller in its normal

socket, or when using the Deluxe Hand Controller. This reduces the risk of spoiling a

long exposure photograph due to an accidental key press.

In either case, you will need to make sure that the Hand Controller is set to either the

Photographic or All-Speeds Mode.

4.2.3 Connecting an Autoguider to an Older Gemini

4.2.3.1 Connecting an Autoguider with Relay Output

Autoguiders with relay outputs (such as the SBIG ST-4) can be connected to the Gemini

system directly. Simply connect one side of each of the four relay contacts to the

Autoguider input common pin, and connect the other side of each relay to the appropriate

direction input pins of the autoguider port. Cables are available for most compatible

autoguiders to plug directly between the autoguider and Gemini.

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