The PAC-R2 network ports have to be on separate sub-nets and they have no inter-connectivity.
Also, unless you write a chart, there is no routing function between the two ports.
A lot of customers use them to segment the control network from the office network. (Same with our PAC S controllers).
The whole point of the twin network sub-nets is that the host can not talk to the devices on the other interface.
So to answer your question. No, there no way to change the function to be like a 2 port switch on the EB.
The host can not access the EB1 directly.
Yes. This is the correct way to set it up. One port has the host, the other port has the EB on a local subnet.
Have a click around on our networking webpage, it might help you see some options;
Often people put the PAC R controller at the end of daisy changed group of EB’s. This way you can use the 2 port switch of the EB and still talk to all the devices and the controller without any extra network hardware.
Feel free to come back and ask questions.