Flashcard: Central Alarm System Architecture and Communication — 18 carte

Overall System Architecture — purpose?

Visualizes components and their interactions.

Components of central alarm system?

Controller, detectors, display, communication modules.

Hardware modules — interactions?

Modules communicate via RS485 bus and interfaces.

Detector_t structure — role?

Stores detector data: address, type, state, description, timing.

Configuration table — purpose?

Holds all detectors' configs and current statuses.

Detector data fields — examples?

Address, type, state, description, zone, last_seen_tick.

Detector initialization — process?

Load configs from EEPROM and prepare detectors for operation.

Loading configs — source?

From EEPROM/Flash during system startup.

RS485 frame format — start byte?

0xAA header.

RS485 command codes — example?

0x01: poll, 0x02: reset alarm, etc.

Response codes — example?

0x81: normal, 0x82: alarm, 0x83: fault.

CRC validation — purpose?

Ensures data integrity over RS485 frames.

Polling engine — function?

Interrogates detectors and updates statuses.

Alarm handling — steps?

Update detector state, log alarm, display info, activate outputs.

Display_ShowAlarm — displays?

Alarm details: type, address, description, zone, value.

EEPROM storage — purpose?

Persistently saves configuration data across power cycles.

UART config interface — use?

Configure detectors and system via serial commands.

Main loop — tasks?

Polling detectors, updating display, handling events.