DM-20

Secure Multi-Door I/O Module.

DM-20
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Overview

DM-20 is Suprema's secure multi-door I/O module, adding four independently controlled doors to any CoreStation deployment via a single RS-485 OSDP V2 connection. Each door port supports Wiegand reader input, dedicated relay output, supervised door contact and REX input — providing complete door control in a single compact module. With its Cortex M3 processor, 130 × 90.5 × 35.8 mm housing and 12 V / 3.1 A power supply, DM-20 is the standard expansion module for large enterprise access control deployments where a single CoreStation must manage multiple door points efficiently.

Key Features

4-door expansion

Adds up to 4 independently controlled door points per DM-20 — extending CoreStation coverage across large facilities.

Wiegand reader inputs

2 Wiegand input channels accept credentials from any Wiegand-output reader — integrating legacy and third-party readers.

OSDP V2 encrypted control

All door relay commands travel over OSDP V2 RS-485 from CoreStation — encrypted, authenticated, tamper-detected.

4 supervised relays

4 relay outputs with 4 supervised inputs and 6 auxiliary outputs — full door-state monitoring alongside lock control.

Specifications

General
CPU Cortex M3 72 MHz
Memory 128 KB Flash + 20 KB SRAM
Dimensions 130 × 90.5 × 35.8 mm
Weight 220 g
Operating Temperature -20 °C to 60 °C
I/O
Wiegand Inputs 2ch
Inputs 4ch
Supervised Inputs 4
Relay Outputs 4
Auxiliary Outputs 6ch
Doors Supported Up to 4
Connectivity
RS-485 OSDP V2 compliant
Power 12 V DC Max 3.1 A

Interested in DM-20 for your organisation?

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