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Handbox RCX400 KO ?

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#1 Laurent.baeckeroot

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Posted 22 April 2021 - 05:02 PM

Good evening everyone, I'm a french astronomer and I had a problem with my RCX400, I believe it was the battery for the GPS but a priori no: here is:

I changed the battery inside the RCX, nothing better .. worse since tonight (but it used to sometimes) by setting everything manually(ie I do as if there is no GPS)
that is to say: I fill in the place (46.4°N 1.23 E) I save it in the racket, I modify the time , the date, GMT+1 , daylight saving (daylight daylight saving ) a oui, mount in equatorial table mode (polar)
Moreover I know that my equatorial table is well put in station .

In short all the parameters, I make an alignment on 2 stars and the ca goes completely wrong: I go to Arcturus manually, I synchronize .
I ask to go to Spica and the ... patatra la raquette me dit qu'elle n'est pas levée ...
I double-check all my parameters: RAS. I make an alignment via the racquet, I position on the polar, I synchronize , the racquet must go automatically on another star ..
It goes on Vega .. but not to the North East but due South!!!

I turn everything off, I raise again , and the racket erased the data (date and time:) it is on September 6, 2001 (the last time I turned it on it was on September 1 , it was 6 days ago that it made me - amazing right?
same time has been saved , but the last time , the time is reset at 2:06 am!! I do it regularly this week...

I opened the racket: no battery on the Autostar II. it must be fed directly via the mount (question how is the time and date saved? by the GPS battery?)

-----
I ask for your opinions and your search on the Internet if there are any who have had these problems... me , I am dry ...

 

So in the best of cases if it comes from the racket and it is HS , in your opinion the Autostar II rackets for the LX200 are they compatible with the RCX?
thank you for helping me
amicably
Laurent Baeckeroot


Edited by Laurent.baeckeroot, 22 April 2021 - 05:02 PM.


#2 Peterson Engineering

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Posted 23 April 2021 - 07:48 AM

Your hand control is dumb - juat a package of switches.  Recommend that you try running the scope doing a 2-star manual align.  



#3 Laurent.baeckeroot

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Posted 23 April 2021 - 07:59 AM

running witk 2 star is KO .

 

one of my friends suggests something else because the handle controls are completely wrong since I changed the battery to power the GPS:

 

"all the symptoms you give are related to loss of memory battery, I looked on the internet, there is actually no battery button in the racket, there is necessarily a memory-holding system either by a tantalum capacitor or a Dallas (battery-based memory) on one of the telescope maps or a button battery on the motherboard."

 

do you have any suggestions? please?



#4 michael8554

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Posted 23 April 2021 - 11:42 AM

Meade mounts only remember Site (46.4°N 1.23 E) , not time, not date.

 

With GPS ON, time, date are set from the GPS.

 

"it is on September 6, 2001"

 

Has the RCX worked correctly since April 2019 ? 

 

No ?  Firmware will need updating due to GPS Rollover:

 

https://en.wikipedia...Number_Rollover

 

"I modify the time , the date, GMT+1 , daylight saving (daylight daylight saving )"

 

Modify will not work with GPS ON.

 

To disable GPS:

 

Switch ON.

 

Set GPS OFF.

 

Switch OFF

 

Switch ON, you set Time and Date, and RCX will work ok.



#5 Laurent.baeckeroot

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Posted 23 April 2021 - 03:27 PM

I saw this but I don’t think so because when I deshinibe the GPS, and I am in "manual" mode for the site , time and date . I put these parameters to my place, the right time and the right date (with the right format). And when I turn off the telescope, when it’s switched on, it doesn’t keep the date in mind... according to a buddy, it could be a "Dallas" capacitor (?) he says to me: "the memory is maintained by a specific battery or capacitor (Dallas, CR 2025 etc.) and is not taken on the main power supply. In your case the component in question is HS, you just need to know where it is to replace it.
What do you think others had this problem?



#6 OzAndrewJ

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Posted 23 April 2021 - 04:40 PM

Gday Laurent

If the GPS id OFF, the mount has no internal clock

so on the next reboot, it defaults to the last used date, and 8:00PM.

( the battery in there is just to keep the GPS units almanac alive, it does nothing else )

 

Andrew Johansen Melbourne Australia



#7 Laurent.baeckeroot

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Posted 24 April 2021 - 03:16 AM

Thank you for your answer, but I don’t think it’s fair (?) indeed:
even with the GPS off, there must be an internal clock since when my problem occurred 6 days ago,
He put on September 1st and every day he incremented a day.
The GPS is off and today it initializes the date to September 6th.
There must be a capacitor or qqch that keeps the date in memory.
When the GPS is in On, yes the date and time sync to the correct date.
According to friends, the batteries have nothing to do, the memory is maintained by a specific battery or capacitor (Dallas, CR 2025 etc) it is in no case taken on the main power supply.

Laurent



#8 michael8554

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Posted 24 April 2021 - 10:36 AM

The only situation I can think of that might keep the date incrementing is if the mount is in "Sleep" mode between being used.

 

OzAndrewJ - is there anything in MyScope that would enlighten ?



#9 OzAndrewJ

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Posted 24 April 2021 - 05:36 PM

Gday Michael

There is nothing in MyScope that can tell if there is a clock in the RCXs

There are also no schematics for the RCX.

I havent spent a lot of time on disassembling all the RCX code and

cant bench test it as it needs its own specific main board, and i dont have one.

 

Laurent mentioned early on "I modify the time , the date,"  so i assumed no clock

Also, I certainly dont remember the units having an embedded clock,

and i dont remember any code for one, but i guess its possible.

If that were the case tho, if the GPS was set to off and you booted up

then the system should not ask for date / time.

If someone can try that, it might point one way or another.

 

Andrew Johansen Melbourne Australia

 

 

Andrew Johansen Melbourne Australia



#10 michael8554

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Posted 25 April 2021 - 06:36 AM

"if the GPS was set to off and you booted up

then the system should not ask for date / time."

 

Surely with GPS OFF it should ask for date / time ?



#11 OzAndrewJ

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Posted 25 April 2021 - 06:41 AM

Gday Michael

Surely with GPS OFF it should ask for date / time ?

Normally yes, but Laurent is postulating that the RCX has an inbuilt clock

ie

even with the GPS off, there must be an internal clock

sooooooo, if it does have one ( and i am not sure of that )

then on booting with the GPS off, it should read it rather than ask for the date/time.

Thats the test i was proposing.

Andrew Johansen Melbourne Australia


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#12 Laurent.baeckeroot

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Posted 25 April 2021 - 09:37 AM

GPS turned off , the default date is 09/01/2001!
When I put the date to today and turn off the telescope, today’s date is not memorized.
When I turn the teleescope back on 3 days later, the date is 09/03/2001!!!

He did not memorize the date but yet he increments a date from a date he has in memory ...
Otherwise when I change the GPS on the way, the GPS fixing stops at 3 asterics..

Do you know if there is a bug with the satellite reception for the RCX , I read that some GPS did not pass 2020... (?)
there is also a forum on which someone has changed the GPS of the RCX , it looks great:
https://www.cloudyni...0-gps-solution/

 

Does that mean the GPS doesn’t pass 2020?

I came back to Paris without my telescope, and  I can’t test it for a few weeks. the telescope is in the countryside
Thank you for taking part in my questions, thank you all!

Laurent



#13 OzAndrewJ

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Posted 25 April 2021 - 05:34 PM

Gday Laurent

 

GPS turned off , the default date is 09/01/2001!
When I put the date to today and turn off the telescope, today’s date is not memorized.

When I turn the teleescope back on 3 days later, the date is 09/03/2001!!!

He did not memorize the date but yet he increments a date from a date he has in memory ...

That doesnt make sense to me, ( ie the date changed ) but i am not expert in the RCX,

The reported date would indicate you have the GPS rollover bug tho.

 

Otherwise when I change the GPS on the way, the GPS fixing stops at 3 asterics..

Thar normally means it has fixed.

 

Do you know if there is a bug with the satellite reception for the RCX , I read that some GPS did not pass 2020... (?)

Yep. As per above, there is a known rollover bug that sets the date 1024 weeks earlier than today

01 Sep 2001 to 26 Apr 2021 is close to 1024 weeks behind ( the bug limit )

but that only cuts in if you use the GPS.

You mention having the GPS off and the date still increments on rebooting, and thats not normal.

Easy test tho

Load my app

http://members.optus...om.au/johansea/

and let it connect to your scope

Go to the GPSData tab and hit the ":gps#" button.

The GPS data should start streaming to the screen

Look at the contents to see if they are correct for everything but date.

If so, the GPS is working but the firmware needs to be patched.

 

there is also a forum on which someone has changed the GPS of the RCX , it looks great:

Yes, i worked with him on it, but i dont know the exact operations in the RCX.

My guess is it will work the same way as the LX200s tho.

 

Andrew Johansen Melbourne Australia




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