DC02-485 Double Door Controller 1. 2 doors, 4 Card Readers 2. Wiegand 26 input 3. RS232/485 4. Anti-pass Back, ... to the number of unsuccessful attempts, the time limit for door closing (door alarm), the duress code... Whenever required, the data stored ... bus line can reach up to 3000 meters RS485 Double Door Access Controller, 2 door / 4 readers