Great answer thanks.
If I disable line crossing on all five cameras it still only allows intrusion on camera 1.
Sure I’ve seen a document explaining what can be allowed depending on max camera resolution.
I series Nvr, PTZ camera.
http://www.hikvisioneurope.com/portal/portal/Technical%20Materials/02%20%20NVR/00%20%20Product%20Firmware/04%20I-series/Release%20Notes/EU-External_NVR_V4.21.005%20build190509_Release%20Notes-V5.pdf
page 16
I'm still baffled by the different types of network cameras that Hikvision supply and I guess that I will never fully understand as they seem to be constantly updating their products.
As I see it;
Series 2 - Value Series/Pro Series
Easy IP, WiFi
Series 3 - ?
Series 4 - ?
Series 5 - Ultra...