EverFocus TFT-LCD MONITOR EN-75084C - Manual (Page 28)

N/C (Normal Closed): When Trigger cable is opened, Trigger function is activated.
N/O (Normal Opened): When Trigger cable is closed, Trigger function is activated.
High: When Trigger signal is high(2~5[V]), Trigger function is activated.
Low: When Trigger signal is low(0~0.6[V]), Trigger function is activated.
INSTRUCTION MANUAL ……………………………………………………………………. 21
7. Auto switching
1) Press the up(▲) or down(▼) button to select the Auto switching.
2) Press the right( ) or INPUT button.
7-1. Auto switching On/Off