The Edwards Catalog 2000-MTC Master Timer/Program Clock is a compact, microprocessor controlled clock capable of maintaining system time for Edwards digital clocks and many third-party secondary clocks. The unit consists of a display unit and power/relay that can be assembled in a surface mount configuration. The display unit has a digital display that shows the date and time and provides programming menus to guide the user through programming and operating modes. A 12 button key pad is used to manually enter commands and programming instructions. The front panel LEDs indicate control relay status. The 2000-MTC uses the Edwards 2000-DCT-REL for timing control.

All wiring to AC power and secondary equipment (clocks, bells, and zone controls) connect to terminal blocks within the power/relay unit backbox using quick connects supplied with the master clock.

Time synchronization is derived from the AC line frequency. The clock automatically detects the selection of 50 or 60 Hz. During power failures, accurate time is maintained by a quartz crystal supported by lithium battery backup. When AC power is restored, the clock's microprocessor calculates the amount of time lost and resynchronizes the secondary clocks. In addition to the hourly and periodic synchronization of secondary clocks, the master clock can automatically adjust for daylight savings time.

The master clock has eight signal circuits, four of which can be designated for clock synchronization. Circuits not used for synchronization can be manually operated by the key pad, or automatically, according to the active schedule. Each relay circuit can be wired to a separate path to control signal devices in specific areas.