Trilogy DL3500

Electronic Mortise Keypad Lock

Reviews (2) | Customer Questions (7)


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

SKU: DL3500
Your Current Selections:
Your Current Selections:
  • 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
    • PC interface cables required 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

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.

See this lock with Prox Card feature

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

Exterior Dimensions

11 1/16 (H) x 3 (W) x 1 15/16 (D) in.

Inside Dimensions

11 1/16 (H) x 3 (W) x 31/32 (D) in.

Door Thickness Minimum

1 3/8 in.

Door Thickness Maximum

1 7/8 in.

Battery Type


Battery Life

80,000 Cycles

Code Length

3 to 6 Digits

Code Capacity


Event Audit Trail


Outside Operating Temperature Range

+151°F ~ -31°F



Door Stile Width

Minimum 5 in.

Door Prep



Alarm Lock



Lock Features

Audit Trail, Passage Mode, Scheduling

Handle Type

Lever Handle Door Locks

Locking Device

Mortise, Mortise w/Deadbolt

Door Opening


Access Type

Key, Keypad – Digits


Deadbolt, Classroom

BHMA Rating

Grade 1 (Best)


10 lbs


2 Year Manufacturer


Single Factor

Share your thoughts!

5 out of 5 stars

2 reviews

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What others are saying

  1. Bill McCray

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

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  2. Angel from Maryland

    Trilogy DL3500 works, Great, very reliable, works around the clock.

    (0) (0)

    Something wrong with this post? Thanks for letting us know. If you can point us in the right direction...




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Customer Questions & Answers

  1. Answered by the admin

    This model is not field reversible and needs to be specified to fit a right-handed or left-handed door prior to placing the order. 

  2. Answered by the admin

    Yes, this lock will accurately keep the Time and Date that is programmed into it and codes can be preenrolled to work during certain times or days. 

  3. A The model of the lock is determined by design. You can take a picture of the front of the lock and we will be able to tell you the model that you have. Please send the photo to [email protected] and they will be able to assist you.
  4. Answered by the admin

    No, you are able to program by hand if you wish, but it is not recommended for more than a few codes as the more you have the better it is to have a database backup should something go wrong. 

  5. A When the deadbolt is engaged it will not be retracted or unlocked by the keypad. The key from the key override must be used to open the door and retract the deadbolt from the keypad side of the door.
  6. Answered by the admin

    Yes, this lock does have the ability to be scheduled for auto unlock and relock of the door. You can set schedules either at the lock itself via the keypad or by purchasing the software for programming the lock. 

  7. Answered by the admin

    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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