RED DIGITAL CINEMA DSMC2 BRAIN with HELIUM 8K S35 Sensor (2018 Unified DSMC2 Lineup) - Manual (Page 239)

24V RS
The DSMC2 Production Module features two (2) 24V RS (run/stop) connectors.
The two (2) Fischer 3-pin 102 connectors supply a combined 24V power out at a maximum sustained current draw of
2.5A. Each connector also includes a run/stop (R/S) trigger input. To operate the contact closure style trigger, short
Pin 3 (R/S) to Pin 1 (ground).
WARNING: DO NOT apply voltage to Pin 3 (R/S).
Figure: 24V RS (Looking at the Connector)
FISCHER 3-PIN CONNECTOR
PIN SIGNAL DESCRIPTION DIRECTION
1 GROUND Common ground N/A
2 +24 V OUT +24 V out, 2.5A max (shared between the connectors) Out
3 R/S Active Low to start/stop record (3.3V pull up) In
CONTACT CLOSURE STYLE TRIGGER BUTTON CIRCUIT (24V RS)
The diagram below shows the contact closure style trigger button circuit on the 24V RS connector.
Figure: Contact Closure Style Trigger Button Circuit Diagram (24V RS)
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DSMC2 HELIUM OPERATION GUIDE