The manual for the SD1 doesn't have the advanced options 4 to 9, and the date is for a new model SD1+, also the SD1 doesn't have a code option so the quote "I still cannot progress beyond creating a 'NEWCODE'." should have given some indication to model. Also re-reading the first message, "quote" "Again from 'READY', if I press 'O' 'CLEARBY' is indicated. But pressing 'B', 'CLEARBY' still remains on the LCD!". I haven't tried this as I don't have any models with the bit switch on, but reading from the manual (installation not operators), it defaults to "clear by no-one" (if you have the switch of course)..
Just a thought... do you have the installation instructions or just the operators??? If you do, goto section 9.
Regards Dave