Film-Tech Forum ARCHIVE: Use GPO and relay on Showvault

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Topic: Use GPO and relay on Showvault

Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 03-25-2019 09:38 AM

You don't need to find GND in a GPO. If at all, it is available on a (shielded) connector shell, forwarded to the cable screen.

But for an optoisolated GPO to work, GND is not necessary. Get a multimeter or continuity tester and just measure resistance/continuity accross two adjacent pins. You could e.g. setup an autorepeating SPL, setting all GPOs up after another, the check continuity while playing that playlist.

Someone once mentioned on this forum that on some Doremi IMBs, the GPOs wouldn't work at all, possibly due to missing parts. I don't know wether that's true, or wether it's just a false impression caused by many different wiring versions without a clear scheme to find the right one. However, with a continuity or resistance meter, you should be able to find out quickly what's going on.

- Carsten

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Biraj Thakuri
Film Handler

Posts: 11
From: Nepal, Pokhara 11
Registered: Sep 2017

posted 04-20-2019 08:29 AM

Thank you for the clarification Carsten.
Will definitely give it a try. Will keep the thread updated.

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