Thanks Charlie, David and Doug for the advice. I guess I'll tie my receiver ground to the DMX shield line or look into the opto isolator. Doug I'm curious ,do...
... The Maxim "isolated" RS485 transceivers I saw allowed up to 50V difference between the two ground systems which is fine for getting rid of ground loops but...
David Duffy
david@...
Mar 2, 2003 4:48 am
3187
We use the Doug Fleenor units in most cases. These include a separate wall wart for power. They use a high speed optoisolator as the input, effectively turning...
Doug Mobley
doug@...
Mar 2, 2003 10:17 am
3188
... The latest draft DMX spec goes into a good deal of detail on transmitter and receiver grounding practices, and proposes appropriate labeling for the ...
... Reading it just now, isolated receivers are the preferred type and need to have greater than 22M Ohms between pin 1 and chassis. The resistance between pin...
David Duffy
david@...
Mar 2, 2003 12:56 pm
3190
... Sounds like a reasonable grounding topology to me. Drivers are basically hard to protect if you connect 220V across them, or from one side of the line to...
Grounding is a difficult issue because there are several different topologies widely deployed. I would start by looking at the draft spec for DMX512-A which...
... Thanks for all the info Doug. I appreciate it.The problem for me is this is to be a stand alone device so I'd have to build the isolator on board. ... Yes...
... Did I see your name on the PicList in the last few days? What have you done the PCB layout in? If it's in Protel or you can send me a graphic of it, I can...
David Duffy
david@...
Mar 4, 2003 9:55 am
3194
Jim, Just to join in in the barrage of suggestions, I offer you mine. The general rule on earthing that I always observe is to connect chassis ( ie Metal case...
Thanks again everyone. I've learned a lot from you all. I've ordered a couple of DCR010505P Burr Brown (Now part of Texas Instruments) isolated DC/DC...
Just a quick note to remind people that this is truly the place to keep an eye open for unusual equipment being pulled out of shows that have come down. Case ...
Thanks for the practical suggestions Iain. I tried connecting the chassis where you suggested but in my case it didn't seem to help. I'll be installing the...
I understand a few on this list use VNC for remote access to computers for show control and the like. The new deloder work uses the VNC port and an IRC "bot"...
jdow
jdow@...
Mar 11, 2003 1:11 am
3200
Just writing to see if I am still on the list David ... From: Ian.widrick [mailto:ian.widrick@...] Sent: Tuesday, March 04, 2003 6:47 PM To:...
Froberg, David
david.froberg@...
Mar 19, 2003 6:18 pm
3201
This is a test. Please ignore. Will this message make it to the list?...
Turner, Roy
roy.turner@...
Mar 20, 2003 5:21 pm
3202
In a message dated 3/20/03 9:22:55 AM Pacific Standard Time, ... It not only got to the list, but the list sent it on to me. :) Michael [Non-text portions of...
Why didn't I get it but I got your message? David ... From: heldenboy@... [mailto:heldenboy@...] Sent: Thursday, March 20, 2003 9:58 AM To:...
Froberg, David
david.froberg@...
Mar 20, 2003 6:04 pm
3204
In a message dated 3/20/03 10:05:38 AM Pacific Standard Time, ... I am not sure -- I looked at the headers for the original test message and (although I know...
I thought you could see your own message when you post, I can't now. I didn't see my test message afew days ago nor the one I sent to you. Did your message...
Froberg, David
david.froberg@...
Mar 20, 2003 6:34 pm
3206
The list has been unusually quiet for over a week now. Perhaps the big guns decided to move the more meaningful discussions off list! :-) Michael E. Landon ...
In a message dated 3/20/03 10:35:37 AM Pacific Standard Time, ... Yes, I get my own messages sent to me on the list, but this is an option that you can change...
Ok don't shout me down, I know it is probably in the Archives but I can't open them. Also whilst it's quiet and we are all doing our version of Test 1, 2. A...
Braham Ciddor
bciddor@...
Mar 20, 2003 11:56 pm
3209
I think there as product like that on display at ENTECH 2002, if I remmber correctly and by looking at the floor plan it was on the "A brighter image pty ltd "...
Therešs something called Holo View I believe, that is another product. There are are several variations out there. ... Best wishes, Marc Rosenthal Personal...
Marc Rosenthal
marc@...
Mar 21, 2003 12:37 am
3211
There's no luck like dumb luck! The current (March 2003) issue of Sound & Video Contractor (www.svconline.com) has an article on video projection screens....
Doug Mobley
doug@...
Mar 21, 2003 6:21 am
3212
... Nope ..... There has been a very productive Show Control PDW at the USITT Conference which has occupied a few of us 'medium guns' from Sunday through ...
We've also seen several variations, few of them work worth a hoot. One that does work reasonably well is the Holo Screen by dnp. Available between 40" and...
Dave Spiro
dspiro@...
Mar 21, 2003 11:18 am
3214
Hi All, I have a project coming up involving projection of still images on 4 screens simultaneously, originally this was going to be done with slide projection...
