ACU board for access control and integration of signals with control over 4 readers with 4 door opening relays. Capacity for 100,000 cards. It has 8 alarm inputs and 8 outputs. Includes power supply and support box. TCP-IP (ETHERNET). All ASD / 4 models comply with the 'Environmental Class III' standard. Grade 4 Access Certified if it is installed as ASD/4-G.