• Tamper-resistant locking keyboard
• Program up to one year in advance
• Weekly cycle with day omission
• 9-volt battery backup keeps time 14 days during power outage
• Battery backup keeps time even during power outages
• 12- or 24-hour time readout with Countdown timer
• Easy to set and operate
• Serial interface for remote monitoring
• Modular design allows easy inter-change of components in the      field

40 On/Off Programs
     Assign up to 40 independent programs, each with independent On and Off times, in any combination to the (up to four) 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
     Any program can be set to repeat, or Cycle, anywhere from once every 2 seconds (1 second on, 1 second off) to once a year. This feature can be used to simulate photoperiodic variation (to adjust for daily changes in the times of sunrise and sunset) and for short interval repetitive operations.

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

Calendar Operations
     ChronTrol's versatile calendar 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 moves 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 remaining until the occurrence of any of its programmed events.

Easy Verification
• Audible Keyboard Entry Entries made through the front panel keyboard are acknowledged with an audible tone for each key.
• Next Program Program numbers can be assigned in any order, or ChronTrol will choose the next available program automatically.
• Cross-Review feature allows the user to find out immediately what program or programs control any given circuit.

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 and performed via computer terminal through ChronTrol's RS-232 serial communication port. Or, by attaching a modem to this port, programming can by performed remotely over the telephone to facilitate centralized control.

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

• ON time (AM or PM, to the second)
• OFF time (AM or PM, to the second) (ON and OFF times can be set to occur on a specific date within the next 12 months)
• Cycle length (from 2 seconds to one year)
• Day Omission (inhibits program operations on any day or combination of days within the week, including holidays)

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 VA

Wiring
     Direct to relay, ¼" quick-connect

Access
     Standard knockouts on all four sides

Relays
     20 amp single pole, single throw

Wiring
     Single row terminal strip, SEMS top hardware with Common (C), Normally Closed (NC), and Normally Open (NO) contacts for each relay. Will accept AWG 12 and smaller wire. USE COPPER WIRE ONLY.

Access
     Four (4) 7/8" diameter bottom entrance knockouts and four (4) 7/8" diameter side entrance knockouts for power source and circuit wiring.

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

Inputs
• Number of available inputs: 8 digital inputs
• Input timing: Edge triggered, with programmed enable/disable on each input
• Minimum input pulse width: 100 ms (1/10 sec.)
• Maximum input pulse width: Indefinite
• Minimum delay between pulses: 2 seconds
• Input electrical:
    Current: 500 µA (requires switch closure or open collector individually or in groups)
    Connection: 9-pin D-subminiature, female

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

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

Power Consumption
     7watts (not including relays)

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)

Enclosure Type
     Wall mount with locking, hinged front cover access

Enclosure Finish
     Black textured paint

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
     XT-W8: 8" x 10" x 4" (H/W/D) 203mm x 254mm x 100mm
     Expander module: 2-1/2" x 11-3/8" x 2-3/4" (H/W/D) 63mm x 288mm x 70mm

Shipping Weight
     XT-W8: Approx. 24 lbs. / 11 kg
     Expander module: 2.5 lbs / 1.1 kg

WARRANTY
     Limited, 1 year parts and labor.

Design and specifications subject to change without notice.