Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

DMX lighting control question
DMX lighting control question
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th July 2018, 06:18 PM   #1
Riaan is offline Riaan  South Africa
diyAudio Member
 
Join Date: Jun 2018
Default DMX lighting control question

I know this forum is mainly about audio, but maybe someone can help a noob out... I actually have two questions:

1: Can I put more than one fixture on the same channel and with the same starting address? Like for instance, having four LED parcans on channel 1 with a starting address of 1 on all four of them?

2: I have read somewhere that at the last fixture on your daisy chain you should connect a 120ohm resistor on the output. Is this true?

Thank you!
  Reply With Quote
Old 8th July 2018, 08:34 PM   #2
conanski is offline conanski  Canada
diyAudio Member
 
Join Date: Mar 2013
1. Yes no problem. If you do this just know that you don't have individual control over each fixture, so for example you can't run a chase across these 4 fixtures they will always do the same exact thing.

2. Yes a DMX terminator is always a very good idea, solder a 120ohm resistor across pins 2 and 3 of a standard male XLR connector and plug it into the output of the last fixture in the chain.
  Reply With Quote
Old 8th July 2018, 10:14 PM   #3
MAAC0 is offline MAAC0  Portugal
diyAudio Member
 
Join Date: May 2010
Riaan


Please bear in mind there are some DMX fixtures with terminations jumpers.
On those You just have to flip a switch on the last one in the chain. Check the manual.


I've run installations without terminator and it works fine with a few fixtures and short cables. Say a truss with 4 pars for example.


Sometimes problems arise with ground loops and cheap fixtures.
If You are running DMX from a lappy and You lights play havoc, try first disconnecting the laptop PSU ground in order to determine it. If they work fine, get an insulated interface.


Check that none of them is in auto or music mode. You can't mix DMX with auto fixture programs since they use the same DMX connectors for master-slave signals.

Last edited by MAAC0; 8th July 2018 at 10:16 PM.
  Reply With Quote
Old 10th July 2018, 04:00 PM   #4
Riaan is offline Riaan  South Africa
diyAudio Member
 
Join Date: Jun 2018
Thank you!

That is great, because I would want about four of them right next to each other, doing the exact same thing.

I will be using an (analogue?) DMX controller because I just like the feel of that.

And maybe I'll build myself a terminator, just for fun!

Thanks again for the help!
  Reply With Quote
Old 10th July 2018, 10:03 PM   #5
MAAC0 is offline MAAC0  Portugal
diyAudio Member
 
Join Date: May 2010
Riaan


Analogue DMX controller ? DMX is a digital RS485 signal (cousin of RS232 but balanced)


There are only two kinds I know:


Lighting desk with real sliders and buttons. I believe this is what You mean
Computer interface / software based with Buttons and sliders on screen. (You need a mouse and / or Keyboard)
Well there is another kind called automatic. You program the DMX stream on it and it plays stand-alone forever. I built an AVR based DMX 4 Ch chaser which changes colors at a given speed.
  Reply With Quote
Old 11th July 2018, 12:58 PM   #6
Riaan is offline Riaan  South Africa
diyAudio Member
 
Join Date: Jun 2018
My bad. Yes, that is what I meant. I couldn't come up with the right word.

I don't even know why, but I just love sliders! Just the way it feels I guess... I don't know...
  Reply With Quote

Reply


DMX lighting control questionHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lighting question, Wrong forum? GSiekman The Lounge 2 31st March 2013 08:59 PM
lighting controller from a control voltage? thedrewberg Everything Else 0 2nd February 2010 06:06 PM
DIY Lighting Control Help/Ideas/Theory Drew Everything Else 4 20th December 2003 02:20 AM


New To Site? Need Help?

All times are GMT. The time now is 02:37 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki