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The Magic Cafe Forum Index » » F/X » » DMX Terminator - 120 Ohms or 100 ohms resistor ? (0 Likes) Printer Friendly Version

plainman007
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Special user
630 Posts

Profile of plainman007
HI guys,

I'm sure you all know that a dmx terminator plug is a resistor soldered across pins 2 and 3. Now what I wanted to know is some people say that should be a 100 ohms resistor, some say it should be a 120 ohms resistor. Can any of you tell me which is the correct value ?
glodmagic
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USA
501 Posts

Profile of glodmagic
120 ohm is the industry standard for DMX512 impedance termination. Most problems come from the use of standard mic cables and 5 to 3 pin adaptors. I have not had problems with short runs.

Here is a good source for an overview as opposed to the abundant "DJ lighting" sites filled with incorrect information.

http://www.tvtechnology.com/features/let......or.shtml
Remember ANY of your posts here can be Googled by your customers and Clients. Just entering your name in Google can bring up your negative comments that stay for years!
silverking
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Inner circle
4586 Posts

Profile of silverking
You may also be interested in what Doug Fleenor's idea of a terminator is, he see's a terminator as much more than a resistor across a couple of pins.

Using Doug's terminator is standard practice for large scale systems.

http://www.dfd.com/term.html

Doug's site is also worth a look around, he's known around the world as "Dr. DMX".....when it comes to DMX knowledge, he's da' man.
Kline
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Veteran user
362 Posts

Profile of Kline
120 ohm is standard. Take a look on line ( ebay ) - sometimes you can find them pretty cheap.
We carry a few extra while on the road - it seems that they are always the first thing to get lost.
Steven Kline
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<BR><BR>www.stevenklineproductions.com
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@steveklinemagic
Fitz
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Elite user
Phoenix, AZ
476 Posts

Profile of Fitz
This information was found in the High End Systems Technobeam user manual found at ftp://ftp.highend.com/pub/Products/Techn......beam.pdf

I hope this helps,
Fitz

Technobeam® User Manual Overview of Controller Operation 2-5
Terminators
The last device on each link must have a 120 ohm, 1/4 watt (minimum)
terminator attached to its Data Out connector.
You can construct terminators by following the instructions below:
Figure 2-4. Constructing a data cable terminator. 120?

1. Obtain a male XLR connector.
2. Disassemble the connector.
3. Solder a 120 ohm resistor, minimum
of 1/4 watt, between pins 2 and 3.
4. Reassemble the connector.
5. Install the terminator in the Data Out
port of the last device in the link.
I have a daily web show all about magic at http://FitzMagic.info
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