Blau 4KDC controller computer port purpose?

[ste83]

Hey All,
This is my first post, so I am sorry if its been asked before. I am still getting used to the site.

I have a Blau 4KDC return pump. Its been so reliable which is such a relief. BUT, I keep wondering what the computer port is for. Recently I got an Apex Neptune Pro and am now wondering if the 2 can be linked together using that port. Thing is I dont know what cable to get for it, what its purpose is or what the steps are to set it up.

Any help would be very appreciated. Thank you

 

[Gumbies R Us]

Do you have a picture of the port?

 

[ste83]

Do you have a picture of the port?

Heyyy sorry, thought I had, my mistake! Here's the pics of what I'm looking to connect. Apparently the apex can control the controller.
The top pic is my apex pro. The bottom 2 are the Blau controller