Nah I just lazy on labelling , first fix hardly ever label ,
I see some IT guys doing there second fix , swearing about the first fix with nothing labelled ,but none of them carry the probe they don't even know how to buzz them out ,although if you have 100cat5 and looking for only one it will take them some time without a tone tester
You mean scb mode uses internal battery to activate sounder and hold off is just charging
And sab mode draws power from panel hold off when bell activated
Both have a separate trigger
Or something like that
You would have to look at the stand alone smoke alarms sell by date aswell
One bell will be in sab mode other bell I'm scb mode
scaMtronic only good for basic alarm , many systems have wireless though
Texecom
Hkc
Don't think the Vanderbilt will work for you if you need good wireless options
Keeping existing contacts and pirs , depends how well they are working but after 17uears why you want to keep them?
I still have my yellow by one, slightly modified jack end
Like this is what I use
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F254245653828