Design Requirements

From ACCX Products Wiki
Revision as of 08:25, 31 October 2011 by Arclight (talk | contribs) (→‎General)
Jump to navigation Jump to search

Specifications for Open Access 3.0 Hardware

General

  • Based on Arduino Mega 2560 Microcontroller
  • Control at least 4 doors
    • 4 Form C relays for doors (5A rating)
    • 2-4 Form C relays for alarm, other functions (5A rating)
  • Real-time clock accurate to +/- 20ppm
    • Battery backup for date/time
  • Allow for 4 Wiegand Readers
    • 6-pin format to allow control of LED/Beeper
      • PWR,GND,1,0,LED,BEEP
    • Allow for wide range of pulse widths
      • 20-400uS pulses from logic high to GND
  • 8+ Supervised alarm zones
    • 4-state supervision
      • Detect faults such as zone cut/broken, short
      • Detect closed and open states
    • 2-terminal design
    • Include current limiting and ESD protection
  • On-board switching PSU for 5V or 3.3V needs
  • Input power protection
    • Reverse polarity protection
    • Surge and ESD protection
    • Fused input rail
  • External power rails
    • Polyfuses or fuses for additional power outputs
    • Can be on-board or on separate power distribution board

Physical

  • 4x6" form-factor
  • Double-sided, SMT design
  • 3.5mm screw terminals