How many remote annunciators can be connected to the 6820 panel?
The 6820 can be used with up to 16 model 6860, 5860, or 6855 remote annunciators in any combination (sold separately). Additionally, the system supports the 5865-3, 5865-4, and 5880 LED annunciators for a maximum of 8 devices on the panel. (Page 10)
From the official Honeywell Silent Knight 6820 Fire Alarm Control Panel manual, page 10
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