I too would be very suprised if it was RS-232, however I have been unable to find any documentation on how to "hack" the signal. The rearview mirror solution doesn't address the main reason I use the remote display -- if the moving radar is behind you the lights from the detector (or remote display) call attention to the fact that you have a detector. It also encourages those without one to follow closely behind you, inorder to "use" yours. It would just be nice to have a slightly cleaner mounting location.