Sony HDS-7100 User Manual page 278

Outputting an on-air tally
5
Repeat steps 1 to 4 as necessary to carry out the settings for all
of the input ports.
Note
Regardless of the selected channel, the "4:3" and "16:9" settings
always apply to all channels.
To output ON AIR TALLY from GPI OUT, set F1 (GPI OUT
ON AIR TALLY) to "ON".
Chapter 10 Setup Operations
10-15 10-15