The Simplex 565-143 is an internal interface board for the Simplex 4100 fire alarm control panel, handling board-level communication and interface functions within the panel card cage.

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
• Installs in the designated 4100 card slot with factory connectors and standoffs
• Carries communication or device interface functions on the 4100 backplane
• Specified by part number to match the host 4100 panel revision
• Intended for service replacement and panel build-out on installed systems
• Used across commercial and institutional 4100 fire alarm installations

The Simplex 4100 series organizes its electronics as a modular card cage, with interface boards routing communication, monitoring, and auxiliary signals between the panel CPU and the IDNet signaling line circuit. Boards in the 565 family are revision specific, so matching the original part number keeps an installed 4100 system aligned to its listing and avoids a broader platform migration while the panel stays in service.

Verify panel and device family compatibility before ordering.