There are files in the files section that may help.
This for example
if that doesn't work there are 11 other files dealing with X10 in the files section so those may help too.
Your Marmitek IR7243 looks suspiciously like the X10 IR543AH and a lot of the files in the X10 files section talk about being for the IR543AH
see
hereGood luck
Stoobie