Monitor Dynamics MDI RTU-200 2-AC/FIM Safenet RTU System 10VAC 16VA 60Hz

Monitor Dynamics MDI RTU-200 2-AC/FIM Safenet RTU System 10VAC 16VA 60Hz

The Monitor Dynamics Inc (MDI) RTU-200 is a wall-mount remote telemetry unit (RTU) configured as a 2-AC/FIM Safenet monitoring system. Built by MDI of Rancho Cucamonga, California, this unit houses a multi-board internal assembly including a dedicated processor card and telco interface board, interconnected via ribbon cables and terminating at screw-type terminal blocks for field wiring. It is designed to monitor and report AC power and facility status conditions as part of MDI's Safenet supervisory alarm and telemetry network. The unit was manufactured in April 1995 and carries the reference installation manual designation MDI-RTU-200.

Specifications & What's Included

• Manufacturer: Monitor Dynamics Inc (MDI), Rancho Cucamonga, California
• Model: RTU-200
• Configuration: 2-AC/FIM
• System: Safenet Remote Telemetry / Supervisory Alarm
• Input Voltage: 10 VAC
• Power Rating: 16 VA
• Frequency: 60 Hz
• Input Current: 1 Amp Max
• Form Factor: Wall-mount metal enclosure with latch door
• Internal Processor Board: MDI Assy No. 100576 — 175B Processor board with NM27C256Q EPROM memory ICs and MC74HC138AN logic ICs
• Internal Telco Board: MDI Telco Assy No. 200007-12, Rev B (copyright 1989) — with terminal blocks, filter capacitors, and power transistors
• Additional internal boards: multiple smaller MDI interface/relay boards mounted in the enclosure
• Interconnects: internal ribbon cable harness
• Reference Manual: MDI-RTU-200
• Date of Manufacture: April 1995
• Country of Manufacture: United States

Applications

The MDI RTU-200 Safenet system is a remote telemetry and supervisory alarm unit used to monitor AC power status, facility conditions, and discrete alarm inputs at unmanned or remote sites — typical deployments include telephone central offices, telecom equipment huts, cellular base stations, utility substations, and similar critical infrastructure locations. The 2-AC/FIM configuration indicates it monitors two AC power inputs and supports FIM (Facility Interface Module) functions, reporting status changes back to a central network operations or alarm management system over the Safenet protocol. MDI's Safenet product line was in wide use across the telecommunications and utility sectors through the 1990s as a cost-effective solution for distributed supervisory control and alarm reporting (SCADA-adjacent) without requiring full SCADA infrastructure. These units are still sought for maintenance and expansion of existing Safenet-based monitoring networks.