From the manual for the Optoma ZH406ST:This projector supports all commands of PJLink Class1 (Version 1.00).http://pjlink.jbmia.or.jp/english/That being said, could you please: Try this test file with your two projectors PJLink Test.izz.zip. Let me know the model number of your Epson projectorsLet me know the IP address of your Optoma and Epson projectors