SGP and Losmandy Gemini 2


I have my G811 mount working perfectly with SGP through the Gemini ASCOM Driver. Except-

The park does not work properly. In fact when I ask it to park it tries to go under the mount!

The ASCOM Driver works perfectly and parks the scope as it should. I have set the arrow buttons in SGP so they match the directions in the Gemini Ascom. I park the mount in the CWD position, then ask SGP to SET this as the park. If I then slew with the arrows in SGP that works fine, but when I ask it to park it goes past the stop and keeps going way past the horizontal. How far it would go I don’t know because I stop it to prevent damage.

Other users of SGP with Losmandy mounts tell me theirs do the same.


Not all mounts implement the Park command on ASCOM (i.e. SkyWatcher). My Paramount does, however, and once I set up the park position in TSX, SGP reliably parks it to that position. It is using ASCOM (I also have my own observatory application that also uses the ASCOM park command.)
Two things come to mind - SGP does not use the ASCOM park command with Gemini driver (easy to check in the ASCOM log file for the mount)
the Park setting you mention is not working as it should


Thank you I will check the log file.


Here is the log file, it doesn’t really mean much to me.

Also the profile for the Gemini ASCOM Driver, this does park the scope properly.


Using the Gemini ASCOM Driver control panel (in the ASCOM driver, NOT SGP) verify that park does what you expect it to. I’m guessing you’ll need to either 1) set the correct park position in the driver or 2) select one of the other park positions (for instance Counter Weight Down (CWD)).



I do set the park in the Gemini driver and it is set to CWD, ie the standard polar home position. The park works perfectly in the Gemini driver. It just goes haywire in SGP. If used it would cause some serious damage to kit! For now I am using the Gemini Ascom controller to park at the end of the session. It does mean though SGP can’t be left unattended to park at the end of a sequence. It would be safer if the park command was disabled in SGP rather than having it slewing between the tripod legs. I have spoken to other uses and they report the same issue.


All SGP does is call the ASCOM Park command, the interpretation of that is up to the driver. What happens if you click the Park button from the Control Panel?

You can disable the park in the Telescope tab of the control panel.



If I click the park command in SGP it sends the mount south!! If I click the CWD command in The Ascom Gemini driver it parks the mount as it should.

Again I have asked on FB groups if others have noticed the same. They have.

I just park it using the Ascom Gemini controller.

For someone who does not realize there is a problem then it could be very costly. That is why I am bringing it to your attention. It would be safer to disable it permanently in SGP rather than damage someone’s equipment.



Hi Jean,

SGP just tells the Mount, through the Ascom driver, “PARK”. It does not matter if this is a Gemini, Skywatcher, Astrophysics or whatever mount and driver. It is always just “PARK”. The user of that command - in this case SGP - expects that the Ascom driver knows how to interpret this and translate the command in something that the mount will understand and execute properly.

You may want to check if you have the latest Ascom driver. You may also try to contact the Gemini developer and ask if they have seen the issue already.

Kind regards,



Hi All,
Just to confirm…I have a G11 / Gemini 2 and the park function does not work. I have tried everything under the sun :smile: it just does not work. I can also confirm that Prism software has the same exact issue. This was one of the main reasons I migrated to SGP. I was told on the Prism forum that this was brought up by other Gemini users before, and the issue is within the Gemini driver. Ther said the contacted Losmandy with no results. But I’m not a programmer so I can’t really confirm one way or the other. I just wish someone would figure it out.


Thank you for confirming this issue. I don’t have any other software to try it on, so all I can say is that the Gemini Ascom screen works as it should. SGP works for slewing and GOTO, just not parking.