Does the alarm signal also come through the CAT5 cable to the NVR or Blue Iris, or do I also have to run another cable to wire up the 3 alarm wires on the pigtail of this Dahua dome camera?
Does the alarm signal also come through the CAT5 cable to the NVR or Blue Iris, or do I also have to run another cable to wire up the 3 alarm wires on the pigtail of this Dahua dome camera?
It depends on what you want it to do. Alarm I/O on camera are mostly used for external devices like at adding a PIR sensor, floor mat sensor, strobe light or a door chime, etc.
If you want the camera to mark events or record a video when an alarm is triggered, this is done through Ethernet cable to a NVR, you will not need to add wire for this and those alarm wires can be stuffed it inside a junction box out of the way.