Re: Pier Crash - need help diagnosing #ASCOM_V2_Driver
toggle quoted messageShow quoted text
"Can anyone comment on Rolando's statement on setting limits on the CP4 without APCC? Is this possible? It would be incredibly useful in case of a computer crash or software glitch"
I am working on it. We have a software command now that will set the limit at 5 degrees past the meridian in the CP4. It's a simple command that can be sent via the AP Terminal Command Interface. The command will also be in the new release of the keypad software. At the present time we are debating whether to make the 5 degree window variable, but it has not yet been decided.
There are caveats, however. In a non-encoder mount this limit depends on the hour angle being correct, so if the user does a bad recal (example: recal on Vega when pointing at Betelgeuse), then the hour angle is thrown off course, and this will affect the where the limit is applied. Another example is entering 2:00:00 for time when it really is 1400 hours and the entry should have been 14:00:00. Or entering -6 for time zone when it should have been +6. None of this is an issue for one of our Absolute Encoder mounts, such as the Mach2, because the limit is tied to an actual encoder angle that is invariant, regardless of mistakes in time, date, location or recal entries.
So, if you have your whits about you and are certain that the mount is set up correctly, then sending the limit command will indeed stop the mount at 5 degrees past the meridian. If not, then we will get lots of customer service calls with mounts that don't appear to track (because they are past the limit) and the user has no clue that this is the reason (because he forgot that the limit was set).
From: Eric M <eric.marlatt@...>
Sent: Mon, Oct 26, 2020 8:20 am
Subject: Re: [ap-gto] Pier Crash - need help diagnosing #ASCOM_V2_Driver
Can anyone comment on Rolando's statement on setting limits on the CP4 without APCC? Is this possible? It would be incredibly useful in case of a computer crash or software glitch.