DM-20 The DM-20 offers secure door control for up to four doors, facilitated by encrypted communication and two Wiegand reader interfaces for seamless integration with third-party readers. Its wide array of I/O interfaces enables the DM-20 to be a flexible component in diverse system configurations. When combined with a Suprema Device, the DM-20 empowers you to design and implement a centralised access control system with an impressive capacity of up to 32 doors and up to 8 biometric devices through a daisy-chain configuration. This powerful combination streamlines access management while ensuring robust security and convenience