The DM-20 Secure Multi-Door I/O Module from Suprema provides secure door control for up to four doors, along with the ability to implement centralized access control when used in conjunction with a Suprema device (available separately). Encrypted communication ensures that data transmission remains secure.

This module is equipped with two Wiegand interfaces for use with third-party readers, an RS-485 communication protocol (OSDP), four relays, four supervised inputs, four TTL inputs, and six TTL outputs.