We have a number of Benq 660DX projectors and are struggling to control them via an RS232 serial connection. We initially struggled to get any response from the projectors until realizing that the Benq-provided diagram of the cable pin-outs was reversed. Now we are getting some response. Unfortunately, we have two differing sets of protocol documentation from Benq, neither of which seems to be correct. We'd greatly appreciate hearing from anyone who has managed to "talk" to their Benq projector! Cheers, darran.