Where to buy finished connection cable between Powermax + (RJ45) and Vera Lite

I have tried to search for this in the forum, but with no luck - maybe I’m just not experienced enough to know how to find it.
I would like to connect my Powermax + alarm system to my Vera Lite box. I have recently purchased the PowerLink-unit second hand and got the “thing” which makes the PowerMax + have an RJ45 plug for the connection with this unit.
Now I would like to try connecting it to the Vera Lite instead to have a better user interface etc.
But how do I get hold of the connection cable?