Design Requirements: Difference between revisions
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| Line 30: | Line 30: | ||
* 4x6" form-factor | * 4x6" form-factor | ||
* Double-sided, SMT design | * Double-sided, SMT design | ||
* 3.5mm screw terminals | * 3.5mm screw terminals (~60 count) | ||
** 24 terminals for 4x6-pin Wiegand inputs | |||
** 16 terminals for 8x2-pin alarm inputs | |||
** 18 terminals for 6x3-in relay outputs | |||
** 2 pins for power input | |||
** 8 pins for power distribution (optional) | |||
Revision as of 07:32, 31 October 2011
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
- 6-pin format to allow control of LED/Beeper
- 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
- 4-state supervision
- 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 (~60 count)
- 24 terminals for 4x6-pin Wiegand inputs
- 16 terminals for 8x2-pin alarm inputs
- 18 terminals for 6x3-in relay outputs
- 2 pins for power input
- 8 pins for power distribution (optional)