As tbone321 stated, if the projector doesn't support DMX control then it won't natively function.
A device/interface would need to be built as a layer in between your DMX output and your projector. This would be a more advanced project which would require research and a higher level of technical abilities.
Basically a device would need to be built that would monitor the DMX signals and be plug into your DMX controller. The device would also be plugged into your RS232 port of the projector. Then if you want DMX channel one to be the On/off of the projector the device would need to monitor for state changes on DMX channel one. When a state change occurs the device would need to send a signal to the projector through RS232 to turn on or off depending on the state.
This would be technically possible but will require a lot of research and technical expertise. I was just recommending the Raspberry Pi as a platform for this device as others have gotten it to control and receive DMX signals. The following link has some information on getting "Open Light Architecture" working on the Raspberry Pi You are not allowed to view links.
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LoginThis could be used as a starting point to research this project if you choose to move forward with it.