RED DIGITAL CINEMA DSMC2 BRAIN with HELIUM 8K S35 Sensor (2018 Unified DSMC2 Lineup) - Manual (Page 238)

START/STOP
The following devices feature a START/STOP connector:
DSMC2 Tactical Top Plate
DSMC2 Production Top Plate
The Fischer 3-pin 102 supports record start/stop via compatible third-party triggers.
Figure: START/STOP Connector (Looking at the Connector)
FISCHER 3-PIN CONNECTOR
PIN SIGNAL DESCRIPTION DIRECTION
1 GROUND Common ground N/A
2 N/A No connection (NC) N/A
3 R/S Active Low to start/stop record In
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DSMC2 HELIUM OPERATION GUIDE