You are correct, a switch sends and receives on the opposite pair so no need for a cross-over.
I interpreted your post that they were 'directly' connected with no device in between.
I can't establish communication between the Apex controller and the PC.
I tried apex in my browser as well as 192.168.1.50.
So how can I upload the firmware update?
Can I connect my PC directly to the controller as I am doing?
Thanks in advance.