New improved DMX test video.

Thanks for sharing that Clive, very handy. I've something similar in my toolbox for testing output and polarity of 2.1mm barrel connector switch-mode power supplies.. It's quicker than digging out a multimeter..

Gordo

My thought too. It would also give you a handy ground loop for attaching a scope or multimeter

Gordo

Sometimes erroneous voltages find their way onto DMX networks. I used two resistors as a precaution against excessive current flow if a LED was reverse biased. (Most have a peak reverse voltage of 5V.)

Big Clive

As I was watching this I was wondering how it could have helped me find an issue on a job recently, unfortunately it was a swapped connector so it wouldn't have helped. The job was on a BMS using BACnet MS/TP, it also uses RS485. The swapped core was conveniently hidden in a joint box above a ceiling, it took belling out the cores to work it out.

The Tinkering Shed

Just a thought, couldn't you just use one resister on the ground side of both LEDs? They shouldn't every be on at the same time.

Let me know how well it works for the industrial stuff.

Big Clive

Clive I recall saying the original video seemed fine and now I'm embarrassed because I wasn't paying attention. Admittedly I will get engrossed in a project and have to go back and watch again as your dulcet tones carried me along on their own. You are like the Bob Ross of electronics and I mean that in the best way possible. That being said, I'm going to build one of these, but for testing RS-485 industrial stuff.

Michael Thompson

To err is human. To leave the bad video up for our education and enjoyment is Big Clive.

Justin Smith

https://www.youtube.com/watch?v=qeQEev99Vn8

Big Clive

That would be great, for Patrons only. I'm sad that I missed it too ....

Paul Schuur

Oooooo Clive what you get up to in the back of trucks with young eager crew members should be kept quiet.. lol

Young eager crew can be quite "exciting" in the back of a truck. Sudden explosive random flight case movements.

Big Clive

Clive was kind enough to leave the original video online, maybe if enough people ask nicely he will repost the link for those who can't find it :-)

Berkeloid

"Cables that have been stretched by local crew." Okay, I'm local crew. We're not all bad. The random Joe Bloggs's we get from a local recruitment agency? bad. "This Mac Viper wont fit in the case, I should force it in!" They left the DMX in. Tour guy had to get his Gerber to pry it out. Then there's the joy of loading a truck with one of them... Or when they get too eager with the truss/anything rigging related during the out...

It’s definitely mentioned a few times in passing that pin 1 is ground. I think it’s fine for people to understand how it works. Ewen

Ewen McNeill

not watched the new video yet, but surprised you didn't solder the keyring part to the screen conductor. That'd make it stronger, even though the glue/resin is going to be pretty tough.

Pixscotland

Damn - wish I'd seen the original faulty video now :D Really simple and handy device to have in the kit.

John Carr

The last time you covered pin usage and said pin 1 was ground. I didn't see that this time.

Mark Trombley

You are in the proper sequence this go around.

Thanks for the video Clive.

Nuts 'n' Proud