I'm trying to control a BenQ SP840 via RS232, i think the protocol is ok as my discrete On/Off commands work but my discrete input select doesnt!!!
The commands im using and if they work or not are below-

"\r*pow=on#\r"         On           OK
"\r*pow=off#\r"         Off           OK
"\r*sour=hdmi#\r"     HDMI1      Not Working
"\r*sour=hdmi2#\r"   HDMI2      Not Working
"\r*sour=RGB#\r"      VGA1        Not Working

Excuse the quotation marks , im using Control4 and it requires them.

I'm assuming the commands are ok but if some could elminate them, that would be a big help.

Many thanks

 

Did you ever get this solved or are you still working on it?