BAV99 :
If the PIN 3 of BAV99(Q9) is Low-level ( 0V ), Said system detects VGA
monitor;
If the PIN 3 of BAV99(Q9) is high-level (nearly 3.3V),said system doesn’t detect
VGA monitor;
VGA module components：
5.3. VOUT Output Module (Local Preview Image Output Module)
VOUT main control chip: SGM9111, PIN 3 pull-down 75Ωresistance
(RS188) grounding and input CVBS-OUT signal, PIN 4 through the
75Ωresistance (RS117) output VOUT signal, working voltage through a
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