Here is how you change Inputs on a Image Pro II
Create TCP Connection in the Connection Manager
Connect to Port: 10001
TCPSEND,TCP Connection ID,RTE 4[CR LF]
This will change the Input to Input 4 - Displayport
This was tested here on Firmware 2.50.06
A list of command supported by the Image Pro II can be found in the Image Pro II Manual which is available on the BARCO Website.