Yes. See the “Vestibule Configuration” section of User’s Guide 75.5886.
900 MHz only
75
No. Day-Night mode only works based on a switched input (e.g. key switch or external timer).
No. The BR2-900 has only “dry” output using relays 1A or 1B. You must make/break the positive wire to the lock.
Yes, but two BR2-900s will be needed because it is only capable of sequencing in one direction.