Dahua IR High Speed Dome Camera User Manual page 23

Attention:
a. Alarm input must be ON/OFF input signal, any other types of input
signal(such as power voltage etc) is possible to damage the unit. When
there are alarm signals from multi channels, the unit will respond to them
one by one, the interval is 3 seconds.
b. Once there is alarm signal coming in, the unit will not respond to ―Scan‖ ,
―Cruising‖ etc functions. Manual operation is needed to restore ―Scan‖ ,
―Cruising‖ etc functions.
c. For the input terminals which are not connected with detectors, 2.2KΩ
risistor must be connected, otherwise the speed dome will thinks that there
is alarm signal coming in, thus the alarm output is always on.
5.5.1 sketch for Series Connection Alarm input (with Constant-closed
detector)
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