(Repeated here from the big AE700 thread, since (a) it's tweak related and (b) it's REALLY IMPORTANT
Originally posted by exsodius:
"And we now know that the 2 options in rs232 is 232 or D-sub. And D-sub is the vga input. So maybe this means that you could upgrade firmware with the vga input too. And thats a lot easier than opening the projector. "
Makes sense, since there are a lot of unused pins on a DB15 VGA connector. All you need for RS232 serial is transmit and receive and maybe a flow control data line.
Just whip up a DB9 to DB15 adapter once we know the pinouts on the AE700 DB15 VGA port.
Look at the traces on the circuit board that connect to the DB15 VGA connector- it may yield more clues.
Also, if someone is adept with an oscilloscope and/or voltmeter, they could select "RS232" in the EXT2 menu, then scope the pins not used by the R-G-B-H-V lines on the DB15 port to sniff out the serial data lines...
Here is a pinout table for a standard DB15 VGA port:http://www.mycableshop.com/techarticles/VGA.htm
The EXT2 menu option prolly switches pins 4, 11, 12, and 15 from Monitor ID data lines to RS232 serial data lines. All that is required for RS232 communications is 4 lines (or less).
It would probably be safe to make a prototype adapter cable that taps these 4 pins. Using a simple terminal program, you could probably try all 16 combinations of pin connections and see if you get an ack in the terminal window.
Of course, we need to know the baud rate/ stop bits/ flow control parameters of the serial lines. These might be deduced from earlier Panasonic AE100-500 projectors.
DISCLAIMER- If you fry your AE700 and/or house and/or loved ones trying this, it's YOUR FAULT
P.S. We REALLY NEED the AE700 Service Manual! I am certain these issues would be described there...
PPS- I see a big aftermarket in DB15 to DB15/DB9 Y-breakout cables brewing, allowing simlutaneous VGA and serial port connection...