Dahua DH-PFH610V User Manual page 9

Port
CAM1/CAM2
AC24V/DC12V
Port Function
3.4± 0.1V. The voltage is 0V when the IR light is off.
Power output port. It is the same as the voltage of the external
power supplying source.
Power input port. Connect to external power sourcing.
Figure 2-4
5