Two Reader Expansion Module

Data sheets 

• MR52 Two Reader Expansion Module (ADC-AC-MR52) - Data Sheet

• Two Reader Expansion Module (ADC-ACX2) - Data SheetThe Two Reader Expansion Module (ADC‑ACX2) adds two readers, six relay outputs, and eight programmable inputs to an Alarm.com Door Controller.

Installation guides

• MR52 Two Reader Expansion Module (ADC-AC-MR52) - Installation Guide

• Two Reader Expansion Module (ADC-ACX2) - Installation Guide

• Wire a Door Position Switch to an Two Reader Expansion Module (ADC-AC-MR52)A Door Position Switch on an Access Control door allows you to track the open or closed status of a door as well as relock the associated door lock instantly when the Door Position Switch returns to a closed state. It also helps you identify if a door was Forced Open (i.e., if a door has been opened without a user badging in or triggering a request-to-exit device).

User guides

How-to troubleshooting guides

• MR52 Two Reader Expansion Module (ADC-AC-MR52) is showing tamper

• Two Reader Expansion Module (ADC-ACX2) is showing tamper

Frequently asked questions

• Can I use a Mercury MR52 Reader Interface board from another provider?

• Can the PFL terminal on the Two Reader Expansion Module be used to monitor AC power failures?

• What are the jumpers on the ADC-AC-MR52 for?

• What are the jumpers on the ADC-ACX2 for?

• When should the Two Reader Expansion Module (ADC-AC-MR52) be set to use PASS or 12V for the reader power?

• When should the Two Reader Expansion Module (ADC-ACX2) be set to use PASS or 12V for the reader power?

Videos