I've done a few DS-KV8102-IM Hikvision systemes, one directly wired with cat5 cabling and a cable for power for the lock and the other were there was only mains power at the gate which we used a power line adapter to send the data down the existing power cable.
They are a video system also with a card reader built in with the added advantage of being able to link to your phone with a app. So it will call your phone when called and you will have remote access to open the gate wherever you are.
That's really helpful thanks I've had a read up and it looks very interesting ...how have you found the reliability and speed of the device and application...I was looking for something that is 100% well at least 99.9% reliable