Users Manual Part 1
57
● There are two alarm input types: NO/NC.
● When connect the ground port of the alarm device to the NVR, you can use any of the GND ports
().
● Connect the NC port of the alarm device to the alarm input port (ALARM) of the NVR.
● When there is peripheral power supplying for the alarm device, please make sure it is earthed with
the NVR.
2.3.3 Alarm Output Port
● There is peripheral power supplying for the external alarm device.
● In case overload might result in NVR damage, please see the following relay specifications for
detailed information.
● A/B cable of the RS-485 is for the A/B cable connection of the speed PTZ.
2.3.4 Alarm Relay Specifications
Table 2-42 Alarm relay specifications
Model: JRC
-27F
Material of the touch
Silver
Rating (Resistance
Load)
Rated switch capacity
30 VDC 2 A, 125 VAC 1 A
Maximum switch power
125 VAC, 160 W
Maximum switch voltage
250 VAC, 220 VDC
Maximum switch currency
1 A
Insulation
Between touches with same
polarity
1000 VAC 1 minute
Between touches with different
polarity
1000 VAC 1 minute
Between touch and winding
1000 VAC 1 minute
Surge voltage
Between touches with same
polarity
1500 V (10×160 μs)
Length of open time
3 ms
max
Length of close time
3 ms max
Longevity
Mechanical
50 × 106 MIN (3 Hz)
Electrical
200 × 103 MIN (0.5 Hz)
Temperature
-
40 °C to +70 °C
2.4 Two-way Talk
2.4.1 Device-end to PC-end
Step 1 Connect the speaker or the pickup to the first audio input port on the device rear panel.