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Microprocessor-based Programmable

XT Rack-Mount Timers are ideal for broadcast stations, theatres, studios, and all facilities that use standard 19 inch rack-mount instrumentation. The programming power of these timers allow users to program their antennas once and forget about it.

  • Ideal for broadcast stations, theatres, music systems, studios, communications systems, instrumentation systems
  • Video recorder control for satellite program delay
  • Sampling control of air and other fluids
  • Process control
  • Directional broadcast
  • Security system timing
  • Remote data collection/ transmission control
  • Laboratory equipment control


  • Twenty (optionally 40) programs
  • 2, 4, 6, 8, 12, or 16 independent SPDT outputs
  • Up to 8 inputs for external activation
  • Cycle times from 2 seconds to one year
  • Separate On and Off time settings and cycle times on each program
  • Six-digit display shows hours, minutes, and seconds
  • Directly replaces multiple mechanical timers
  • Tamper-resistant locking keyboard
  • Program up to one year in advance
  • Weekly cycle with day omission
  • Microprocessor controlled
  • Completely field-programmable
  • Battery backup keeps time even during power outages
  • 12- or 24-hour time readout
  • Countdown timer
  • Field-proven dependability
  • Easy to set and operate
  • Serial interface for remote monitoring



ChronTrol Rack Mount timers give you time-programmed control of up to 16 independent circuits used to operate devices such as tape or chart recorders, program switching, lights, sound distribution equipment, fans, solenoids, pumps, motors, or other equipment. With 20 independent On/Off programs - or up to 40 programs optional - you can exercise control right to the second, AM and PM, every day of the week.

Time settings are entered right from the keyboard, with settings displayed on the digital clock during entry. Any or all of the available programs can be applied to an individual output, so the On/Off sequencing can be as simple or as complex as you require.

An electronic keyboard lock with a selectable unlock code provides security from unauthorized changes.

These rugged units are available with 2, 4, 8, 12 or 16 independent outputs. Each output is equipped with 20 amp SPDT relays as standard equipment, each rated up to 277 VAC.

Up to 8 inputs can be connected, allowing timing sequences to be synchronized with external triggers, such as manual pushbuttons or switch closures from other equipment.

These timers can be computer-controlled, either directly through an on-board serial communication port, or remotely by modem over the dial-up telephone network.

ChronTrol timers are also available in table top and wall mount versions.


Twenty On/Off Programs (40 optional) Assign up to 20 independent programs, each with independent On and Off times, in any combination to the (up to sixteen) individual circuits. Settings are made to the second from the keyboard, with AM/PM selection. Each program has individual cycle length and day-of-the-week omission settings.

Cycle Length A program can be set to repeat, or Cycle, at a rate anywhere from every two seconds (one second on, one second off) to every year. Cycle lengths can be set, and are accurate, to the second.

Day Omission Programmed operations can be selectively omitted on any day or days of the week, including holidays.

Calendar Operations ChronTrol's versatile calendar automatically compensates for leap years and can be programmed for any number of holidays. On/Off programs may be set for specific dates.

Daylight Saving Time ChronTrol's real-time clock can be moved forward or backward one hour at Daylight Saving Time, automatically.

Countdown Timer ChronTrol's display can be set to show, in hours, minutes and seconds, the time re-maining until the occurrence of any of its programmed events.

Easy Verification

Manual Override Any circuit can be switched On or Off immediately without waiting for or disturbing programmed operations.

Power Fail Protection The time of day continues to operate, with crystal accuracy, during power failure. A nine volt battery keeps the clock operating and protects the system memory to prevent the loss of stored programs. When power returns, all occurrences of On and Off events are accounted for, and outputs are switched to the proper positions for the current time, in sequence or all at once.

Inputs Timers equipped with inputs can perform timing sequences that are synchronized or triggered by contact closures, and they can switch circuits on and off based on external conditions. As many as 8 inputs can be wired to detectors, pushbuttons, or automatic equipment through a standard "DB-9" connector.

Use as an Interval Timer Set up to 40 independent timing operations at once. Durations are set in hours, minutes and, if desired, seconds, from one second through one year. Timing intervals can be triggered and re-triggered through the keyboard, or by any of the 8 available inputs, or by other operational programs. Timing intervals can be set to repeat at any rate from two seconds (one second on, one second off) to one year.

Serial Communications All programming information and procedures can be accessed from a computer terminal through ChronTrol's RS-232 serial communication port. By attaching a modem, you can program and monitor the ChronTrol from great distances over the telephone for centralized control.


Code Description
XT-R2 2 circuit Dry Contact model  
XT-R4 4 circuit Dry Contact model  
XT-R8F 8 circuit dry contact model, 40 programs
XT-R12F 12 circuit dry contact model, 40 programs
XT-R16F 16 circuit dry contact model, 40 programs
Optional Equipment
Code Description
F 40 programs
N8 8 inputs
240V 240 volt power source
When ordering, add option code to the basic model number. Example: XT-R4FN8 is a four circuit dry contact Rack Mount Timer with 40 programs and 8 inputs.



Number of available circuits: 2, 4, 8, 12 or 16 independent circuits.

Number of On/Off Programs: 20, or optionally 40, each assignable to any or all outputs. Each On/Off program includes the setting of:

Optional interval timing: Each On/Off program can be made an interval timer by specifying a duration of time instead of specifying an On or Off time. Durations can be set from one second through one year.

Display: .56'' continuous LED display of time-of-day or program information.

Power switching capabilities:
0 to 277 volts AC:
20 amps per circuit @ 240 VAC
6 amps per circuit @ 277 VAC

Relays: 20 amp single pole, double throw (SPDT)

Wiring: Direct to relay, ¼" quick-connect

Circuit Status Indicators: LED circuit ON indicator (one per circuit)


Time base: 50/60 Hz line frequency (automatically selected) with crystal backup system.

Power source:
120 volts AC ± 5%
240 volts AC ± 5%

Power Consumption: 6 watts not including switching circuits

Battery backup system: 9-volt alkaline battery provides 14-day protection of memory and time-of-day.

Serial Communications
  Protocol: Serial asynchronous
  Baud rate: 2400 baud
  Data bits: 8 data bits
  Stop bits: 1 stop bit
  Parity: No parity
  Signal level: EAI RS-232C (±12V)
  Connection: 6-position, 4-conductor modular jack (RJ-11 type)

Front panel finish: 1/8" aluminum black anodized
Keyboard: 24-key, dome switch, audible
Environmental range: 0°F to 130°F / -17°C to 54°C; 0 to 90% relative humidity (non-condensing)
Dimensions: 5¼" x 19" x 4" (H/W/D) 133mm x 483mm x 100mm
  (3 rack units) 
Shipping weight: 7 lb. / 3 kg.

WARRANTY: Limited, 1 year parts and labor

Design and specifications subject to change without notice.