ETX90EC to PC connection WITHOUT autostar
Frédéric SCHÄFER
autostar, using the ETX's HBX or AUX port directly ?
Thanks
Fred.
Philippe HAAKE
Impossible......... and don't put yout cable directly to the etx
you'll fried it...
I did it...
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Phil
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Frédéric SCHÄFER
> >autostar, using the ETX's HBX or AUX port directly ?
> >
> >Thanks
> >Fred.
> >
> Impossible......... and don't put yout cable directly to the etx
> you'll fried it...
>
> I did it...
Ok, thanks I will not try it...
But you're thinking about a Meade cable, not an homemade ones ??? I've
tried to look how to simulate the signal send by the electronic controler
(coming with the ETX) but without success, the 2 axis seem to be mutiplexed
on the same wire...
A way is perhaps to shorcut directly the controler keys... I have an
opportunity to fried it, and then to buy an autostar, which is extactly what
i don't want to do...
Roger Hamlett
"Frédéric SCHÄFER" <fsch...@free.fr> wrote in message
news:3e912844$0$28324$626a...@news.free.fr...
> > >Does anybody knows how to control an ETX 90EC from a PC without having
an
> > >autostar, using the ETX's HBX or AUX port directly ?
> > >
> > >Thanks
> > >Fred.
> > >
> > Impossible......... and don't put yout cable directly to the etx
> > you'll fried it...
> >
> > I did it...
>
> Ok, thanks I will not try it...
> But you're thinking about a Meade cable, not an homemade ones ??? I've
> tried to look how to simulate the signal send by the electronic controler
> (coming with the ETX) but without success, the 2 axis seem to be
mutiplexed
> on the same wire...
The signal, is like an I2C bus, comprising a pull up resistor (to the 12v
supply), and controllers that 'pulse' the line low. The format is a
'header', saying which motor is to be moved, followed by a 'count', saying
where it is to move to. It would be possible to generate this pulse train
yourself, using a PIC, or similar microcontroller (this is what the handest
does...), but connection from a PC, without quite a bit of extra hardware,
would be very hard.
> A way is perhaps to shorcut directly the controler keys... I have an
> opportunity to fried it, and then to buy an autostar, which is extactly
what
> i don't want to do...
Shorting the controller keys, with relays, or optocouplers, is the common
way of giving guide control, on systems that don't provide an input for
this. Done carefully, is works well.
Best Wishes
Frédéric SCHÄFER
> > opportunity to fried it, and then to buy an autostar, which is extactly
> what
> > i don't want to do...
> Shorting the controller keys, with relays, or optocouplers, is the common
> way of giving guide control, on systems that don't provide an input for
> this. Done carefully, is works well.
Thanks for those informations.
but... I'have just realized the fact that, by shorting the controller keys,
I would not be able to know how many "times" I send a request.
And my goal is not to replace the controller, but to control the ETC
precilsely for, as example, memorise the axis changes of the position of
Mars between time 1 and time n, so I would be able to make a predictive
function for position at time n+m. But I need to now how many "left",
"right",.., order I've send to move the ETX position from a position (time
1) to another (time n)...
An approximate way is to memorize the time I turn the "left" key relay on,
but I think it would not be as precise as I need.
So I think that the only way is to send the rigth information to the ETX
directly (using a PIC as you said) or... to buy a autostar..
Fred.
Philippe HAAKE
<fsch...@free.fr> wrote:
>So I think that the only way is to send the rigth information to the ETX
>directly (using a PIC as you said) or... to buy a autostar..
That's will be the safer way...... LOL..
Anyway you should also ask or check if there is some info on
http://www.weasner.com/etx/menu.html
the best site for etx users....
Roger Hamlett
activation, you can accumulate the time interval exactly. To use a seperate
processor directly onto the data stream, would involve replacing the
existing controller, since otherwise a command from you to move a number of
counts, would be overridden the next time the hand controller sends another
command...
Realistically, if you want an interesting electronics project, you can do
this by building your own control chip, or if you are less into programming,
doing the access accross the switches, but otherwise the Autostar is bothe
cheaper and easier.
Best Wishes