Thanks for the steer, any difference in functionality (I'm new to both, I just want to web enable the alarm) ?

And is there a tutorial on how to configure ?

So, it looks like its a problem in the way the serial line settings are set in pmaxd.c, there is a bitmask which is used to set comms options, I'm guessing that at some point the meaning of these bits changed on the raspberry pi and it has highlighted a lurking issue in the code. Will advise author ...

Looks like its a few years since anyone tried this setup, wondering if anyone has seen the same issue as me. I wired up, checked with USB to serial in my Windows PC - works nicely. When I get to testing pmaxd I don't get anything back from the panel, unless I power off and on the panel (I read that ...