INTRODUCTION 
DK-2851 is a self-contained two output relay, vandal resistant and weatherproof keypad. It has been designed for full feature stand alone access control applications. It is expandable to work with an optional decoder (DA-2800 or DA-2801) for high security split-decoded operation. It is also compatible with the auxiliary card reader (AR-2802) and the auxiliary keypad readers (AR-2806, AR-2807 and AR-2809) for upgrading a stand alone or split-decoded system to multi-station operation.The keypad can plug in Wi-Fi Module (AP-02) as a Wi-Fi Keypad. 
The keypad is ideally for door strike and alarm arm-disarm controls. It is also a programmable industrial timer (from 1 second to over 24 hours) for automatic operator system.
Two versions are available for DK-2851. They are denoted with a suffix letter “C” & “D”

Demo Video: https://fb.watch/9hP4CdHEE-/

DK-2851C (Standard Version):
Output Relay 1 – 5A Rating N.C. & N.O. Contacts for Door Lock Actuation Control
Output Relay 2 – 1A Rating N.C. & N.O. Contacts for Auxiliary Device Control

DK-2851D (Door Bell Button Version):
Output Relay 1 – 5A Rating N.C. & N.O. Contacts for Door Lock Actuation Control
Output Relay 2 – 1A Rating N.C. & N.O. Contacts for External Door Bell Actuation Control

 FEATURES 

• Dual Relay Output Full Feature Digital Keypad for Door Lock and Equipment Controls
  

• 12-24V AC/DC Auto Adjusted Wide Operation Voltage Range
  

• Built-in Real-Time-Clock Controls The Start and Stop Times in Daily Operation
  

• Stand-alone, Split-decoded and Multi-station Tri-Tech Operations
  

• Compatible with The Auxiliary Reader, Auxiliary Keypad and Split-decoder for System Expansion Simply with Single Wire Connection of  Their Common Data I/O Bus
  

• Accepts 125 Khz E M Card Operation Via Optional Auxiliary Card Reader
  

• Compatible with Fail-safe or Fail-secure Electric Door Lock
  

• 5A/24VDC Contact Rating Form C Relay for Output 1 and 1A/24V DC Form C Relay for Output 2
  

• Built-in Control Logic Circuit for High Security Dual Door Inter-lock System
  

• Timing Re-lock or Auto Re-lock for The Door After Entry Prevents “Tail-gate” Follower
  

• Door Forced Open Warning and Door Propped-up Warning
  

• Maximum 1,000 Users for Controlling Output 1 and 100 Users Each for Outputs 2 and 3
  

• Multi-task Super User Code for Inhibiting (Refuse Access), Overriding Door Lock (Keep Door Open); and Operating The Outputs at Any Time and under Any Condition for Safety
  

• Duress Code for Door Opening and at The Same Time Reporting The Event of Duress
  

• 50 Visitor Codes for Temporary Workers and Visitors, Which Expire after Use or The Programmable Time of 1-99 Hours
  

• Three Programming Options for System Safety Lock-up after Successive False Code Entry
  

• Outputs Are Configurable with 1-99999 Seconds Auto Reset Mode or Start / Stop Mode.
  

• Auto or Manual User Code Entry Mode for User Convenience And Security Enhancement
  

• Pacifier Tone And Door Open Announcer Can Be OFF for Silent Environment
  

• Standby Flashing LED Indicator Can Be OFF for People Do Not Like Flashing LED at Night
  

• Four Egress Delay and Warning Options for User Convenience and Security Enhancement
  

• Key Button Active Signal Output for Triggering Optional Equipment
  

• Built-in Tamper Switch with N.C. Dry Contact
  

• Standard and Door Bell Button (Using Output 2 as Bell Actuation Contact) Versions Available
  

• Vandal Resistant Weatherproof Keypad with Back-lit Metal Key Buttons
  

• Die-Cast Aluminum Box for Surface Mount on Wall or Gooseneck Post

• Wi-Fi Module can be plugged in for more features

 SPECIFICATIONS 

• Operating Voltage:
  12V-24V AC/DC, Auto adjusting

• Operating Current:
  20mA (quiescent) to 90mA@12VDC
  10mA (quiescent) to 45mA@24VDC

• Storage and Operation Temperature:
  -20 C to +70 C

• Storage and Operation Humidity:
  5-95% relative humidity non-condensing

• Working Environment & Ingress Protection:
  All weather, IP-66

• Number of Users:
  Output 1 – 1,000 (User Codes) + 50 Duress Codes
  Output 2 – 100 (User Codes) + 10 Duress Codes (DK-2851C)

• Number of Visitor Codes:
  50, programmable for one time or with time limit

• Timings for Code Entry:
  10 seconds waiting for next digit entry

• The Timers:
  1-99,999 Seconds (Over 24 Hours possible) Independent Programmable Timers for O/P 1 & 2

• Egress Button: 
  Programmable for Instant, Delay with Warning
  Momentary or Holding Contact for Exit Delay

• Input Sensing Terminals:
  a) Door position, b) Egress, c) O/P 1 inhibit

• Output Control Terminals:
  Transistor Open Collector 24VDC/100mA sink Max for the following outputs
  a) Duress, b) Key Active, c) Inter-lock

• Output Contact Ratings:
  Output Relay 1 – N.C. & N.O. dry contacts, 5A/24VDC Max.
  Output Relay 2 – N.C. & N.O. dry contacts, 1A/24VDC Max.
  Tamper Switch – N.C. dry contact, 50mA/24VDC Max.

• Dimensions:
  125(H) X 79(W) X 46/54(D)mm

• Weight:
  510g net

• Housing:
  Die-Cast Aluminum, Powder-paint coating

• Faceplate Material:
  1.5mm stainless steel  

Specifications are subject to change for modification without notice