Just did an eVision 4500 the other day, the projector is PJLink compatible, save yourself the hassle and use that instead.
Side note, although the web utility shows that the projector is Room View / ?Crestron Connected compatible, the projector *DOES NOT* support it. Reason being that the projector is a re-branded unit, I believe the baseline chassis is a Vivitek, hence the completely different command protocol.
Hope that helps.
Rich
