Bidirectional Talk; Device-End To Pc-End; Pc-End To The Device-End - Dahua NVR21-4 KS2 Series User Manual

Surge voltage
Length of open
time
Length of close
time
Longevity
Temperature

2.4 Bidirectional talk

2.4.1 Device-end to PC-end

Device Connection
Please connect the speaker or the pickup to the first audio input port in the device rear panel. Then
connect the earphone or the sound box to the audio output port in the PC.
Login the Web and then enable the corresponding channel real-time monitor.
Please refer to the following interface to enable bidirectional talk. See Figure 2-71.
Listening Operation
At the device end, speak via the speaker or the pickup, and then you can get the audio from the earphone
or sound box at the pc-end. See Figure 2-72.

2.4.2 PC-end to the device-end

Device Connection
Connect the speaker or the pickup to the audio output port in the PC and then connect the earphone or
the sound box to the first audio input port in the device rear panel.
Login the Web and then enable the corresponding channel real-time monitor.
Between touches with different
polarity
Between touch and winding
Between touches with same
polarity
3ms max
3ms max
Mechanical
Electrical
-40℃ - +70℃
Figure 2-72
1000VAC 1minute
1000VAC 1minute
1500V (10×160us)
50×106
MIN
200×103
Figure 2-71
(3Hz)
(0.5Hz)
MIN
Front Panel and Rear Panel 51