I didn't know how to get makehex to do the parity bit. I think I know how Jon did and I didn't want to do it that way (if ZaneH hadn't sounded like he was doing it himself, I would have run MakeHex with two different .irp files and then selected among the results to get the right parity, rather than use 8 bits as I assume Jon did). I really ought to find some time to rewrite MakeHex to be more flexible.

I see Jon made the header "0000 006d 0000 0024", rather than "0000 006d 0024 0000". I think that's a mistake and likely to have some consequences. I don't know enough about the TSU3000 remote to be sure whether that will be a problem in every use or will be more subtle.