SDC 705UL2 DPDT Key Switch Access Controller
Overview
The SDC 705UL2 is a dual-pole, dual-throw (DPDT) key switch controller that bridges traditional keyed access with modern networked door control systems. It's built for facilities that need a discrete, reliable electromechanical switch solution for single-door or multi-door access points — typical deployments are electrical rooms, mechanical closets, server zones, and secondary entry points where a full credential reader is overkill but you still want centralized access logging via OSDP.
Compatibility
The 705UL2 integrates with access control systems that support OSDP (Open Supervised Device Protocol) — the standard for networked door controllers. It accommodates both proximity card readers and keypad input, allowing credential diversification within a single installation. The 630-class strike configuration works with standard commercial door hardware, meaning it fits existing door frame and latch setups without structural modification. For facilities running NFC or 13.56MHz credential ecosystems, this controller supports those credential formats, enabling mixed-credential deployments across multiple entry points.
Installation Notes
Wiring follows standard 24VDC convention typical of commercial access control installations. The DPDT configuration provides relay isolation — important if you're controlling both an electric strike and a monitoring circuit from the same controller. Mount in a weatherproof enclosure if used in semi-outdoor or wet environments; the controller itself is not rated for direct weather exposure. Verify 24VDC supply is conditioned and fused at the panel — undersized or noisy power will cause relay chatter and potential credential read failures.
