Which statement is true about SIA formats such as SIA 8, SIA20, SIA2000?

• A. They include variants such as SIA 8, SIA20, SIA2000 and can send 20-digit event code and 3-digit zone, plus optional partition or area and a 2-digit modifier code (alpha).
• B. They are a deprecated standard.
• C. They cannot send alpha characters in event codes.
• D. They are only used for video transmissions.

Answer: (A)

SIA formats are standardized signaling structures used by alarm systems to report events to a central station. These formats, including SIA 8, SIA20, and SIA2000, are designed to carry specific pieces of information in a consistent layout. They can send a 20‑digit event code and a 3‑digit zone, plus optional partition or area, and a 2‑digit modifier code (alpha). This combination lets the central station know exactly what happened, where it happened, and any extra context in a compact, machine‑readable form. The long event code supports detailed identification, while the zone pinpoints the location, partition/area helps organize multiple buildings or sections, and the two‑digit alpha modifier provides additional descriptive detail without using up the main event code. These formats are current standards used widely in alarm signaling and are not limited to video transmissions; they are used for general alarm events, and they do allow alphabetic characters in the modifier portion.