Trilogy DL3500 Heavy-Duty Electronic Mortise Lock by Alarm Lock
Polished brassDuronodic finish

Trilogy DL3500 Electronic Mortise Keypad Lock



Battery operated digital entry system with time determined access & 40,000 event audit trail.

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SKU: DL3500

GoKeyless™ is a factory trained and authorized Alarm Lock Trilogy dealer. Sales, service, support, valid warranties. It's why thousands of clients around the world choose GoKeyless™ for their security and access control needs each year.

You don’t have to spend thousands on a new access control system.  Not with this out-of-the-box ready, wire-free lock by Alarm Lock.  This impressive keypad lock sells itself with all that it can do.  It stops the hassles and maintenance costs of key control dead in their tracks.  If you’ve been searching for an affordable system that will enable you to designate specific times that employees/managers are allowed access, track entries, and quickly delete users, look no further than this new industrial strength mortise push-button lock by Alarm Lock.  It’s one thing you can cross off your wish list this year.

Office buildings, Healthcare facilities, Colleges/Universities, Military installations, Retail, Pharmacy, Schools, Government buildings, and more!

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  • Heavy Duty, steel-case BHMA compliant mortise lock.  UL listed, FCC certified.
  • Choose from mortise latch with 3/4″ latch projection (classroom function) and mortise latch + deadbolt with 3/4″ latch projection, and 1″ deadbolt projection (office function)
  • With deadbolt function, deadbolt can be locked and unlocked from outside
  • Rugged clutch mechanism insures long life & durability
  • Program at lock, or using optional Windows PC based software – you will need the PC interface cables at checkout in order transfer your user data to the lock and download and review your audit trail.  (software CD included with purchase of cables, or can be downloaded from Alarm Lock website)
  • 500 timed lock/unlock schedule events, including 4 “quick schedules”
  • Quick passage mode (enter without your code)
  • 300 User codes supported, including: Master, Manager, Supervisor and Basic Users. Also one-time entry code
  • WeatherPROOF performance
  • Remote Release Mortise Kit for ‘Buzz-In’
  • Timed entry allowance from 5-15 seconds
  • Greater security with “Temporary Keypad Lockout” after 3 unsuccessful code-entry attempts
  • Audit Trail with Time/Date Stamp for a printable record of all electronic activity
  • Real Time Clock Allows logging of events to within 1 second of accuracy
  • Relay may be programmed to energize when one or more selected events occur
  • 4 Time-Out functions allow a user to enable other users or unlock the lock for some time period without needing to return to the lock
  • Easy to install.  Retrofits into standard mortise preps, modified by adding thru-bolt holes for a snug fit to door
  • Battery Operation:  5 AA’s; appx. 80,000 cycles; low battery alerts; lock may be hard-wired with 9VDC or 9VAC power supply for remote release / battery backup (9V’s sold separately)
  • Key Override/Emergency Key — Includes a 1-3/8″ long mortise cylinder from the manufacturer.  (comes with 2 keys)  All mortise cylinders are interchangeable so if you have a name brand one you want to use you can, or we sell name brand ones.  Please call us at (877) 439-5377 for custom cylinder orders.
  • Keypad:  All metal, 12 button.  All functions programmable through keypad/software
  • Handing:  When ordering ‘classroom’ function, you don’t need to know your specific handing, as the lock is fully reversible.  For deadbolt function, you must specify right or left handing
  • Warranty:  2-year manufacturer
Exterior Dimensions

8″ H x 3 1/4″ W x 1 7/8″ D

Inside Dimensions

8 1/4″ H x 3 1/4″ W x 1 11/16″ D

Battery Type


Battery Life

80,000 Cycles

Door Thickness Minimum

1 3/8″

Door Thickness Maximum

1 7/8″

Code Length

3 to 6 Digits

Code Capacity


Audit Trail Events


Outside Operating Temperature Range

+151°F ~ -31°F



Door Stile Width

Minimum 5″

Door Prep



Alarm Lock



Lock Features

Passage Mode, Audit Trail, Scheduling

Handle Type


Door Opening


Access Type

Keypad – Digits


Deadbolt, Classroom

Fire Rating

UL 3 hr. Latch

BHMA Rating

Grade 1 (Best)


10 lbs


2 Year Manufacturer

  1. 5 out of 5

    The DL 3500 was perfect for my customer’s application. Go keyless has always been great to do business with.

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Questions and answers of the customers

  1. A

    Should you be unable to change the batteries during the low battery warning stage for any reason you can only use the key override to gain entrance and then replace the batteries. 

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