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The??is also useful. Starting on p. 40 it discusses connecting a camera to the auto guider port, and specifically references the ST-8 camera. ?

With the round DIN connectors, you should have the newer version of the Gemini 1.? It has TTL-level inputs (open collector to ground) for guiding so you don’t need the relay box.? See section 4.2.4 on p. 42 of the Gemini 1 manual.? It even discusses the SBIG cable needed to connect the camera, though it’s easy to make one yourself.

? -Les

On 5 Oct 2020, at 16:56, Luis Barneo <lbarneo@...> wrote:

My mount is a Losmandy G11, Gemini 1 level 4, with servomotors 6 pin DIN connectors.?Recently I got a second hand ST-8XE USB SBIG camera attached to CFW8A filter wheel with many accesories,?The problem is that I'm confused how to connect the camera-filter wheel to the autoguider port of Losmandy.?I think that? my mount does not require the "relay adapter box"?(page 42 Gemini User Manual? 2006: 4.2.4 Connecting an Autoguider to a new Gemini (with DIN connectors): "...The SBIG relay box can be used , but is not necessary..."
But the "Application Note Relay Adadter Box"? ()? recommend the use of realy box with all Losmandy mounts even with the Gemini GOTO electronics (pag 1), and in the page 3 clarify (?) when it is no necessary to use the Realy Adadter Box if:
1. You are using the camera with LX-200 telescopes.
2. Your telescope/drive corrector uses "Open Collector to Ground" inputs for guiding.
3. You are using a Losmandy mount running both the camera and telescope? off the 110V AC wall transformers where the camera and drive corrector do not share a common ground.
I'm a layman in electronics. Someone can help me? Thanks

Luis