Re: Funny Slewing under APCC Meridian Delay


Ray Gralak
 

I have an update on this issue. I have given a new build (v1.5.0.10) to A-P which should handle this issue. It should be made available soon. The issue mostly affected APCC Pro users, but there are some meridian limits fixes applicable to APCC Standard as well.

There is one thing to note if you have a GTOCP4. If the mount is in a counterweight-up position and you, or an application, issues a slew then the mount's firmware will do a two or three-part slew. Because both APCC and the CP4 were trying to issue multi-part slews, there was often many mount moves back and forth from the meridian. That has been fixed in this build.

When the CP4 has the mount in any counterweight-up position, any slew will move the mount in RA only to a counterweight down position. A final slew occurs if the final RA/Dec target puts the mount in the normal counterweight-down position. Otherwise, the firmware moves the declination axis to the target's declination value, which is part two of the slew. Part three moves the RA axis to the target, which should be in the counterweight up position.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro: http://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver
Author of PulseGuide: http://www.pulseguide.com
Author of Sigma: http://www.gralak.com/sigma

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, August 17, 2016 1:31 PM
To: ap-gto@...
Subject: RE: [ap-gto] Funny Slewing under APCC Meridian Delay



Wayne, there will be an update to fix this within a day or two. I have isolated the
problem thanks to cluster's post a couple days back.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-
physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro: http://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver
Author of PulseGuide: http://www.pulseguide.com
Author of Sigma: http://www.gralak.com/sigma

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, August 17, 2016 12:52 PM
To: ap-gto@...
Subject: [ap-gto] Funny Slewing under APCC Meridian Delay



I have an AP 1100 and APCC Pro Beta and latest driver. When I set a meridian
delay to go into a CW up configuration, slews are unpredictable. I mean in this way.
I slew to a position, do a plate solve, and do another goto to precisely center an
object. The slew may only require a few minutes of arc. However, the scope slews
west until the mount is pointing about at the meridian and then slews back. It may
or
may not be quite where I want. I've taken to using the move utility to manually
center the object watching FOV indicator live in The Sky X.

Additionally, if I set dithering on in MaximDL using Telescope (no guider) the dither
after the first exposure does the same thing. Dithering with guider works fine.
Anyone else experiencing this? It did the same thing before the beta.

Wayne Hixson



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