RED One remote trigger question

[Mitch Gross]

Forgive me, I'm sure this info is available somewhere. It's a holiday in the US so I don't have access to my files and I'm trying to assist someone on an important shoot.

The trigger input on the GPI/O functions via the Lemo-4 sockets on the rear of the camera. I believe this functions simply by closing a loop between two contacts, correct? It's not one of those circuits where one might need to float a 5 milliamp voltage or any other special parameter, is it? I'm pretty sure we just make connection between those two contacts and the camera is triggered (assuming the GPI is set to start recording). Am I right? Thanks in advance.

Simple question I know, but my guy is in a remote location and needs to build a rig.

[Curt von Badinski]

Mitch, just temporarily tie pins 1 & 2 together. As viewed from the back of the camera they are the top left and bottom left pins on the aux. four pin connectors. One momentary contact will start and another momentary contact will stop. Make sure to use the top port as that is usually set for record start/stop. A word of caution... DO NOT TIE PINS 3 & 4 TOGETHER, bad things will happen.

[Mitch Gross]

Thanks Curt; exactly as I remembered it. I knew you'd know off the top of your head.

[Cail Young]

CVB is right... the Epic, though, is another kettle of fish...

[Michael Hastings]

Can you explain, might want to do this on underwater housing.

[Mitch Gross]

CVB is right... the Epic, though, is another kettle of fish...

Why is that? As I understand it, there is a port on the EPIC body which functions the same way. Different connector and pins, but it functions similarly, correct?

I have another client asking us to make a cable for the EPIC, so this is useful to know. Is it perhaps not yet an enabled feature?

[Mitch Gross]

Found out for myself. A Schmidt trigger, requiring 3.3v to float across it to activate. Can't just be closing a loop anymore, but easy enough to build a little circuit.

[Stuart English]

A Schmidt trigger, requiring 3.3v to float across it to activate. Can't just be closing a loop anymore, but easy enough to build a little circuit.

Correct. For space and other reasons on the camera Brain it's a Schmidt trigger, however on the PRO I/O Module we replicated the RED ONE style 4-pin LEMO with Aux Power Out and GPI/O contact closure / tally signals, so you can use any of your existing cables and accessories without modification.

[Deanan]

Found out for myself. A Schmidt trigger, requiring 3.3v to float across it to activate. Can't just be closing a loop anymore, but easy enough to build a little circuit.

3.3-5v is the recommended range.

[Mitch Gross]

5v -- USB-power anyone?

Good to hear bout the Pro I/O design.