Grass Valley LDK 5417 - Manual (Page 22)

LDK 5417 + LDK 4417 User’s Guide | Adapter controls 10
3.5 Communication
Call button
Press this momentary button (4) to send a signal to the control panels calling for attention.
The ND/RE indicator in the 1.5-inch viewfinder shows when a call signal is sent or
received.