To offer customers maximum flexibility, RED offers two different types of remote trigger (start/stop) protocols: Momentary Ground and Schmitt trigger. The cinema industry commonly uses the Momentary Ground protocol, also known as Contact Closure.
You can reference more information along with the circuit diagrams in our Operation Guide HERE (DSMC2) and HERE (DSMC).
3.3 V Schmitt
The SYNC connector on DSMC cameras and the DSMC2 BASE EXPANDER use a 3.3 V Schmitt trigger (5 V tolerant). The trigger is not a switch closure circuit, so it requires that the trigger source supplies current. Both edges of the input signal may be used as a trigger.
The following devices feature a SYNC connector with 3.3 V Schmitt trigger input:
- DSMC2 BASE EXPANDER
- DSMC EPIC MYSTERIUM-X
- DSMC SCARLET MYSTERIUM-X
- DSMC EPIC DRAGON
- DSMC SCARLET DRAGON
You will want to have the following settings set in camera:
Contact Closure / Momentary Ground
The following devices feature a connector with Contact Closure style trigger input:
- DSMC2 JETPACK-SDI EXPANDER
- DSMC2 JETPACK EXPANDER
- DSMC2 REDVOLT EXPANDER
- DSMC2 V-LOCK I/O EXPANDER
- DSMC2 PRODUCTION MODULE
- RED RANGER camera
You will want to have the following settings set in camera, except for RED RANGER:
When using Third-Party accessories that use our RED Command Protocol (RCP) to trigger Start/Stop, you will need to have RCP enabled in the camera.
Related Support Articles:
RTMotion (Teradek RT) Focus System Start/Stop Configuration on DSMC2
Please contact RED Support with any questions.
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