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Old NexStar GPS motor control and hand control firmware update info

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106 replies to this topic

#101 daslolo

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Posted 01 June 2020 - 01:02 AM

How did you track that ilotus made this board?

#102 tornado99

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Posted 01 June 2020 - 06:57 AM

Just some fairly extensive research. The Motorola M12 Navigation Oncore was used in a wide variety of devices, even sea buoys and oil rigs, so there is still demand for replacement boards to maintain those. The problem is most of them are industrial applications, so it was hard to find a supplier. There is a distributor called Nanometrics in California, but they weren't able to sell to consumers. AliExpress was the only source I found.

 

The module I bought is actually the M12M Timing Oncore which is missing a couple of specialised commands compared to the M12M Navigation Oncore, but luckily Celestron don't seem to use those commands!

 

You can also buy boards from other manufacturers with Baidu and Galileo satellite support, but it's a bit overkill for a telescope and would likely have compatibility issues. The i-Lotus is the only exact drop-in replacement in terms of command set, and even has upgraded performance in terms of sensitivity. 

 

The only caveat, is that if you are turning the telescope on after 1 month the Almanac is out of date and the Timing module takes 150s to link compared to 60s for the Navigation module. But I couldn't find a supplier anywhere for that one.

 

Also, does anyone have advice on how often to charge the GPS if not using the telescope? The spec sheet for the battery claims only 2% self-discharge per year which seems surprisingly good.


Edited by tornado99, 01 June 2020 - 07:03 AM.

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#103 markb

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Posted 01 June 2020 - 08:33 AM

I think I'm going to have to disagree, based on what I've seen, about the effect of a dead battery in a OnCore M12 board.

 

My later model boards that came from China, apparently removed from equipment, came without batteries or clips, having been installed in an application that did not require a battery to maintained downloaded information. My other boards have run completely dead or had the batteries removed for long periods of time.

 

All of them came back fully to life after being left on and exposed to signal in the nexstar11, sometimes requiring a day to fully lock with correct time and location.

 

Again, thanks to Mike for clarifying the types of erroneous dates and locations that could be shown pre-lock.

 

I have always assumed that any prior date information was held in non-volatile ROM or RAM since a working battery seemed only to affect whether the board retained ephemeris or

almanac information, whichever is the more appropriate term, for a faster lock.

 

So I doubt battery changes will present a risk, other than in the risk of damage while replacing it, or the difficulty in getting a proper working replacement battery. I haven't gotten around to my remote battery installation but have all the parts and will do so after I move in a month or two. The wires are already installed in both my bases, with remote battery installation in the arms. I will use a 2032 size IIRC. All it will take is actually slipping a battery into the holder, but I want a block of time to be prepared to deal with any unexpected results. My move has swallowed most of my free time, and weather has been non-cooperative anyway.

 

I'll be keeping my fingers crossed that there will not be a problem with Motorola specific rollover issue.



#104 tornado99

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Posted 01 June 2020 - 01:00 PM

markb, the battery behaviour was only with respect to the original Motorola board after April 2019.

 

A battery-less i-Lotus board manufactured in, say 2006, will never show a date in the year 2000 because, in the absence of a RAM date, it will check its own firmware date and realise that the current date must be more recent than 2006. It's only when it gets to 2026 that such a board would cease to work without a RAM date.



#105 Bandit50

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Posted 17 June 2020 - 02:35 AM

hey guys i just got the dreaded no response 16 and 17 on my nexstar gps 9.25  carbon fiber edition, my dad passed away few years ago and me and my son ended up with it we have had lots of success with the unit  recently i went to ad a hc controller extension and caused it to go blank except for the no response 16 and 17 were not to tech savvy and really would like to repair this scope for sentimental reasons and keep using it does anyone repair this or could i get info on how  maybe i can but its not something i've ever done i could ship it and maybe have a tech get it going again all we need is the motors to work no big deal on gps ,any help would be much appreciated thanks 



#106 mclewis1

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Posted 17 June 2020 - 09:39 AM

Bandit, Welcome to CN, I'd first ask one of the moderators via private message to get your post moved (or perhaps just cut and pasted into a new thread) so we can have a discussion without taking this thread in too many different directions (not like it hasn't gone there already). With your problem there will likely be lots to discuss. 



#107 Michael_Swanson

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Posted 17 June 2020 - 08:36 PM

hey guys i just got the dreaded no response 16 and 17 on my nexstar gps 9.25  carbon fiber edition, my dad passed away few years ago and me and my son ended up with it we have had lots of success with the unit  recently i went to ad a hc controller extension and caused it to go blank except for the no response 16 and 17 were not to tech savvy and really would like to repair this scope for sentimental reasons and keep using it does anyone repair this or could i get info on how  maybe i can but its not something i've ever done i could ship it and maybe have a tech get it going again all we need is the motors to work no big deal on gps ,any help would be much appreciated thanks 

Agree with Mark - please just start a new topic.  Go here:

https://www.cloudyni...zed-telescopes/

and click the Start New Topic button.  I suggested subject is "Tried HC extension cable and now getting no response errors"

 

Sounds like the extension cable was not wired correctly and you have probably damaged the hand control.

 

Best regards,
Mike Swanson
https://www.NexStarSite.com




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