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
The keypad displays the Access Module Door Point is in trouble. Diagnostics displays the point as missing.
T+ (Tamper Input) of the Access Module is an unsupervised input that is normal when open. Upon a short, the Door Point number assigned to the supervised zone of the Access Module is reported as a MISSING PT###.