SWIT Electronics S-1092H - Manual (Page 10)

4.TALLY/GPI Operation
The GPI interface is the DB9 port, the DB9 terminals definition are as below:
User can define each GPI terminal function in the “menu”. It will be on when GPI terminal connected to
GND, and off when disconnected.
Terminal 1
～5: the functions can be set as below:
Undefined Freeze Frame
Tally R Button lock
Tally G PIP
Tally Y Focus assist
SD Aspect Ratio Audio bar
Scan Zebra
Zoom B/R/G Only
Mono Timecode
DB9 1 2 3 4 5 6 7 8 9
GPI GPI_1 GPI_2 GPI_3 GPI_4 GPI_5 VCC_OUT GND