The B8512G and B9512G have slots for two B430 Plug-in Telephone Communicators to provide redundant telephone connections.
Upon power up the panel uses the B430 in the Mod-1 slot until a Test Report is initiated or when the panel phone supervision declares the line currently in use as failed.
B430, B8512G, B9512G
How to address SDI2 devices without causing address conflicts.
Can different types of SDI2 devices use the same address setting?
B810, RFRP-A, B820, B208, B308, B420, B426, B520, B920, B921C, B930, B942.