Grass Valley NewsroomSuite v.5.5 - Manual (Page 44)

Chapter 3 Installing the NewsEdit SC Video Board and Breakout Box (Optional)
40 Digital News Production
Enabling SDI Output on NewsEdit SC
When you have the XenaSD board and Breakout Box connected to your
NewsEdit SC, you can connect an external monitor to your system to view
video output. To enable this feature, on any of the NewsEdit Timeline tools,
click the
Use SDI Output button.
The video output appears on the external monitor.
Use SDI Output