The Simplex 565-831 is an internal interface board for the Simplex 4100 fire alarm control panel, providing board-level communication and interface functions within the panel chassis.

Compliance

• UL 864 listed system component within the Simplex 4100 platform
• NFPA 72 National Fire Alarm and Signaling Code installations
• FM Approved system context (panel dependent)

Key features

• Internal interface board sized for the Simplex 4100 panel chassis
• Mounts in the designated 4100 board slot using factory connectors and standoffs
• Handles inter-board communication or device interface functions on the 4100 backplane
• Specified by part number to match the 4100 panel revision in service
• Intended for service replacement and panel build-out on installed systems
• Used in commercial and institutional 4100 installations

The Simplex 4100 series predates the current 4100ES platform and built large addressable systems around the IDNet signaling line circuit and a modular card cage. Interface boards in the 565 family carry communication, monitoring, or auxiliary functions between the panel CPU and field circuits, and they are matched to a specific panel generation. Replacing the board keeps an installed 4100 system in service without migrating to a newer panel.

Verify panel and device family compatibility before ordering.