DVR systems DVRxx04HF-U Series - Manual (Page 48)

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Maximum switch power 125VA 160W
Maximum switch voltage 250VAC, 220VDC
（ Resistance
Load）
Maximum switch currency 1A
Between touches with same
polarity
1000VAC 1minute
Between touches with different
polarity 1000VAC 1minute
Insulation
Between touch and winding 1000VAC 1minute
Surge voltage
Between touches with same
polarity
1500V (10×160us)
Length of open
time 3ms max
Length of close
time 3ms max
Mechanical 50×106 times (3Hz) Longevity
Electrical 200×103 times (0.5Hz)
Temperature -40℃ ~+70℃
3.9 RS485
When the DVR receives a camera control command, it transmits that command up the coaxial
cable to the PTZ device. RS485 is a single-direction protocol; the PTZ device can’t return any
data to the unit. To enable the operation, connect the PTZ device to the RS485 (A,B) input on
the DVR.
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first.
This series DVRs support multiple protocols such as Pelco-D, Pelco-P.
To connect PTZ devices to the DVR:
1. Connect RS485 A,B on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Please follow the instructions to configure a camera to enable each PTZ device on the
DVR.
Figure 3-8
3.10 Other Interfaces
485 Port
485 Port