If I have multiple By-me control units interfaced with each other on different BUSes, how many can manage the burglar alarm branch?

Only one By-me control unit, the one initialized with Area 00 and Line 00, while the others that must have different Area and Line addresses cannot therefore configure SAI burglar alarm devices (the SAI burglar alarm line is strictly with the address Area 00 Line 00, and on one BUS line there can be only one control unit)