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Just to keep it simple how about this:
EZ4I- 4 optical inputs plus 12V source. Can be used with doorbell buttons and other dry contact devices by using the onboard power or just use the opto input directly for low voltage source detection. Full linking, retries, and cleanup as described by JeffryD.
EZ4O- 4 Form C (SPDT) relays plus an internal buzzer activated by a short across 2 terminals. Any set of relay contacts can be wired to the buzzer terminals for remote doorbell type applications. All contacts should have the option for programmable momentary operation (for garage door type applications) or for delayed off. Should also be programmable to pulse once per second while on as an option to flash an LED or provide a a more urgent sound when wired to the internal buzzer. Full linking, retries, and cleanup as well.