Here's a note from an old email I found, from Sony:
"The manual does not fully detail all steps to enabling IP control, but we need to enable "PJ Talk" from the web menu of the projector.
Start on page 60 of the users manual to load the web menu of the projector using a computer.
Login is : Root
Pw is : (blank)
Go to the setup tab and I believe PJ Talk will be under the advanced menu of the setup tab.
There have been some firmware issues related to enabling PJ Talk, if the serial number of your unit is above 1100264. Then you should be in the clear. If you are 1100264 or below and having trouble enabling PJ Talk then you will need to contact our ES support hotline(866-924-7669)."
Here's a control doc from Sony:
The port number for IP Control is: 53484