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Old 09-09-2007, 03:33 PM   #1
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Default GVG-712 mods?

I'm extremely new to lasers so if this isn't the place for asking advice on modding ready made disco type gear then bear with me.

I recently bought a GVG-712 tri-colour unit which I am having lots of fun with. I would like to be able to programme to spell out my own messages or draw pictures with. The unit currently has about 250 images programmed in which I can't change.

I know nothing about DMX control yet either so am asking if I buy a DMX controller will I be able to do what I am trying to do with that? If not then can I modify the 712 itself?

Yes I know I have jumped in at the deep end!

Thanks - Dave


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Old 09-09-2007, 03:56 PM   #2
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Default Re: GVG-712 mods?

450 --

We're in the same boat. I got a RGY from David Lanling and mine looks like yours. I have the DMX driver but haven't tried it yet. From what I know so far, DMX isnt fast enough to produce raster to draw pictures. I'm watching what others are doing with these.

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Old 09-09-2007, 04:11 PM   #3
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Default Re: GVG-712 mods?

Thanks for response Mike. if your manual is written in Gobbledegook/Chrinese/Engrish then it might well be from the same source. It is almost unreadable! What country are you in?

If it will help anyone give a definitive answer, this is the manual page for the DMX control.


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Old 09-09-2007, 05:32 PM   #4
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Default Re: GVG-712 mods?

I think your best bet if to buy a low end DMX controller. For those DMX controlled scanners, the projector itself has the driver to draw patterns with the galvos. The DMX input is just a control to tell the driver what to draw (hence, you're limited to a few patterns, instead of the nearly free-form canvas pangolin and some fast galvos will get you)
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Old 09-09-2007, 06:48 PM   #5
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Default Re: GVG-712 mods?

I think Pseudo is right about the DMX controlling the Pattens selection. I don't know what can be done with the CH3,4 (x-y) position inputs. Might get a simple picture but no annimation.

There are some differences in our channel assignments -- My CH 7 is static pattern size and CH 9 is color segment.

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Old 09-10-2007, 11:54 PM   #6
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Default Re: GVG-712 mods?

DMX is just a 3 wire serial interface if I remember correctly.

I have a optocoupler schematic that converts to DMX to good old RS232 3 wire.

I'll dig it it up if you want it.

I think sending a batch string of commands continuously would be really cool!! ;D 8-) :

All good music equiptment now days uses DMX control. It's just a serial current loop/dataline. Watch Australian Pink Floyd on TV. They got a Behringer 8024 equalizer like mine, and it has 100 DMX presets avail. ;D

Keyword is Protocol:
example send from your PC, 8 bits to address y then 8 bits for it's freq.........then....
Any software Laserist tools avail?

OOOPS I was wrong!! ;D I got MIDI. Anyways, DMX works the same, just a different plug
data/rate etc. I wouldn't buy a DMX controller because a PC solution would better, you got to send lots of DATA.

Your'e about making me jealous guys!
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Old 09-11-2007, 12:21 AM   #7
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Default Re: GVG-712 mods?

LRod --

You're confusing this old man !!!! *Here I thought all I'd need is DMX (whatever that is)----- Well, I'll keep reading and I'll have DMX control on my RGY in a couple days.
I hope software will improve but there's limits without galvo units.

Be sure to explain how to send a "batch string". I still remember something called RS232 !!

Mike
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Old 09-14-2007, 03:26 AM   #8
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Default Re: GVG-712 mods?

@Mike
You just need a DMX sender that's programmable with user presets. Or make your
own circuit attached to your computer.
That's what I'd do, but it's a big project. But google around and maybee you'll get lucky
with DATA.
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