What the thread found

• A run/stop cable that previously worked reliably may fail to function even with the same camera body due to camera firmware updates or setting changes.
• RED cameras with GPI trigger inputs require proper configuration of pulse interpretation: the first trigger pulse should be set to start recording while the second pulse must be set to stop recording, and having both set identically will cause the stop command to fail.
• The accessory port on the side of a RED camera may have different GPI configuration options than the 4-pin ports on the back.

Depends on

• The exact cause of the intermittent failure was not definitively determined in this discussion.
• The solution provided was specifically for the back-mounted 4-pin GPI ports and may not directly apply to the side accessory port.
• Settings and behavior may vary depending on RED camera model and firmware version.
• No resolution was confirmed for the specific case of using the side accessory port.

Gear in this thread

HU3, MDR

Same gear or parts

1. 2026Power loss on Trinity 2 / Artemis 2 with large cameras (A35, Venice): causes and battery solutions.DisputedFacebookArri Artemis Trinity
2. 2025Custom servo zoom controller for Tilta Nucleus system using Bebob Zoe housing and 7-pin LEMO connectorFacebookSteadicam operators group
3. 2024Mounting Sony Venice 2 on ARRI Trinity with SAM-0 plate: build configuration and balancing strategies.FacebookArri Artemis Trinity
4. 2023Mounting Preston MDR4 focus motor and Light Ranger iris control on an ALEXA 35 on the ARRI TrinityFacebookArri Artemis Trinity