Re: How to prevent small movements
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Roland Christen
If the small move is made as a timed move, the mount will move directly to the new position. This would be the proper way to send small dither commands to the mount, unfortunately not all programs will do this.
If the move is made as a co-ordinate move (GoTo move) then the mount will do a 2 step move, one step out of the CWT up and then a final move into the CWT up. This is called a safe slew.
Since we have no control over your 3rd party dither move, it may be that it is sending a coordinate move and the mount must follow the safe slew routine. I know that is a problem with MaximDL, which sends a new coordinate to the mount even for a simple 5 arc second move. It would have been more robust and logical for them to send a short timed move for small move commands. They do this for guide moves, but unfortunately not for dither. This is also a problem for the mount because when a new coordinate is sent, the mount no longer has the original object's coordinate in memory, so it makes recals no longer as accurate.
APCC has no part in any of this because all it can do is to pass along the commands that are generated by your 3rd party guider program. If they use coordinate moves, then you will get safe slew moves.
Rolando
-----Original Message-----
From: Ray Gralak <groups3@...> To: main@ap-gto.groups.io Sent: Mon, Aug 10, 2020 9:20 am Subject: Re: [ap-gto] How to prevent small movements Hi Konstantin,
> yes that is what I mean. I thought I have the newest firmware (Mach2) and APCC Pro and AP V2, or are there Can you confirm you are using APCC Pro v1.8.4.1, firmware VCP5-P02-05, and AP V2 5.30.10? > special versions for people who wand that behavior? There's no special version for this. I'll have to look into this. But, I will need you to confirm your firmware and software versions (above). > By the way, did find out something about the parking problem from cw up positions? I think that was something possibly in firmware, so Howard/Mike have been looking into that, but I don't know the status. -Ray Gralak Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro Author of PEMPro V3: https://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver > -----Original Message----- > From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Konstantin von Poschinger > Sent: Monday, August 10, 2020 1:48 AM > To: main@ap-gto.groups.io > Subject: Re: [ap-gto] How to prevent small movements > > Hi Ray, > > yes that is what I mean. I thought I have the newest firmware (Mach2) and APCC Pro and AP V2, or are there > special versions for people who wand that behavior? > By the way, did find out something about the parking problem from cw up positions? > > > Konstantin > > > > Am 10.08.2020 um 05:36 schrieb Ray Gralak <groups3@...>: > > > > Hi Konstantin, > > > >> I forgott how to prevent small movements in the cw up area, if the mount is taking small movements for > dithering. > > > > I'm not sure I understand your question. > > > > Do you mean you want to prevent the mount from slewing to cw down when dithering in a cw up position? > > > > If that's the question, can you provide the mount firmware version, APCC version, and AP V2 driver version? > > > > -Ray Gralak > > Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro > > Author of PEMPro V3: https://www.ccdware.com > > Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver > > > >> -----Original Message----- > >> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Konstantin von Poschinger > >> Sent: Sunday, August 9, 2020 5:37 PM > >> To: main@ap-gto.groups.io > >> Subject: [ap-gto] How to prevent small movements > >> > >> Hi Ray, > >> > >> I forgott how to prevent small movements in the cw up area, if the mount is taking small movements for > dithering. > >> > >> Grüsse > >> > >> Konstantin v. Poschinger > >> > >> > >> Hammerichstr. 5 > >> 22605 Hamburg > >> 040/8805747 > >> 0171/1983476 > >> > >> > > > > > > > > > > > |
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