Master Clock System

What is a master clock?

A master clock is used to synchronize subsequent slave clocks within a system. For organizations that rely on accurate time throughout their facilities, a master clock is used to ensure that all clocks in a building run at the same time by reference to the master clock for a time source. These time inputs come from the use of a GPS receiver attached to the master clock or an (S)NTP server through the use of a network/internet connection.

So why use a synchronized master clock system?

Synchronous slave clocks are grouped with the master clock using either network wired or wireless system technologies. In this way, slave clocks can frequently communicate with the master clock and adjust for time changes or even events such as Daylight Saving Time without human intervention.

What is perhaps most beneficial about the use of a master clock system is the use of its scheduling capabilities. Some master clocks come with relay features that allow other systems such as bells, alarms, heating, and air-conditioning to be tied into the clock system. The relays can be programmed to ring bells and alarms or turn on heating and air conditioning at predetermined times. Individual schedules can be set for each relay, allowing businesses and institutions to be proactive. By eliminating the need for individual control over several different systems within a facility, more time may be spent tending to other important matters.

When should a master clock be used?

Not all situations necessitate the use of a master clock. For organizations such as corporate centers or universities, that may not need to interface with other systems, a master clock could be unnecessary. If so, IP may be a potential alternative. IP clocks can be individually programmed to retrieve time from an (S)NTP server directly through an Ethernet connection, eliminating the need for a master clock if accurate time synchronization is all that is desired.

When other groups, such as schools or hospitals need synchronized time, a master clock may be necessary to carry out daily functions efficiently. A high school, for example, may desire to tie its bell scheduling system into its clock system. For such various situations, installing a master clock is extremely beneficial to the flow of daily services offered within an organization


  1. Power sources: Battery, Power over Ethernet, 24V, 110V, and 220V
  2. Available in Black, White, or Custom colors
  3. Range from 9”, 12” and 16” in size
  4. Square or round in shape


  1. Available in 2.5” or 4.0” display with 4 (00:00) or 6 (00:00:00) digits
  2. 12/24-hour mode available on all models
  3. Powered using 24V, 115V, 230V, or PoE (IP model only)
  4. Adjustable brightness levels in each digital clock
  5. LED color display options include Red as standard, along with Green, White, or Amber at an additional cost


  1. Available in rack or wall mount
  2. Easily interfaces with other clock systems
  3. Sapling’s Master Clock collaborates with the Wireless, TalkBack, IP and Wired Systems
  4. Ability to set between 4 or 8 relays where you can program bells to ring
  5. Built-in web interface that allows you to program the master clock from any Internet connection
  6. Countdown feature (SMA 3000, 6000 and 8000 feature) for SBD or SBL 3000 Series clocks to countdown between classes or breaks


  1. Each Time Zone Clock System can accommodate up to 7 clocks
  2. Clock options include 2.5” or 4” digital clocks, 12″ round or square analog clocks, and 16″ round analog clocks
  3. Works with Sapling’s IP, Wireless, or Wired System
  4. International Daylight Saving Time capabilities (where observed)
  5. Custom-made time zone nameplates to represent the time zone/city the clock is displaying
  6. Can assist in a variety of industries, including healthcare, transportation, hospitality, corporate, government, and many more.
  7. Encompasses a seamless design and simple installation
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