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Dahua · Alarms

Dahua DHI-ARM320-W2 Wireless Input Expander

Model / SKU: DHI-ARM320-W2

Dahua DHI-ARM320-W2 Wireless Input Expander. The Dahua DHI-ARM320-W2 Wireless Input Expander is a versatile device designed to integrate third-party detectors into Dahua’s wireless security systems. It supports six types of alarms: intrusion, medical, fire, emergency, gas, and tamper. With a two-way wireless encrypted communication mechanism and frequency hopping technology, it ensures stable and secure communication even in environments with wireless interference. The device operates on three CR123A batteries, providing a long battery life of up to 5 years. It also features a triaxial accelerometer to detect unauthorized movement, triggering alarms accordingly. The expander can be powered by external supplies and sends alarm signals through RF to the hub, which then relays them to platforms like the DMSS app. The device is also cloud-updateable, making it easy to keep firmware up to date. Key Features Six types of alarms: Intrusion, medical, fire, emergency, gas, and tamper. Connects to external power supplies. Triggers alarms when the device is moved. Alarms go off when the device overheats. Cloud update. The two-way wireless encrypted communication mechanism improves the security and stability of communication. With the wireless frequency hopping mechanism, the device automatically hops to other available frequency bands when the original frequency band is being interfered with by other wireless radios, ensuring smooth communication. DHI-ARM320-W2 Datasheet The Dahua DHI-ARM320-W2 Wireless Input Expander is a robust solution for connecting third-party sensors to Dahua’s wireless hubs. It supports multiple alarm types, including intrusion, fire, medical, gas, tamper, and emergency alarms, making it versatile for various security scenarios. The device communicates with the hub using two-way encrypted wireless transmission, enhancing security and reliability. Frequency hopping technology allows the expander to avoid interference from other wireless devices, maintaining smooth communication. Powered by three CR123A batteries, it offers a battery life of up to five years, and it also has an external power option. The built-in triaxial accelerometer detects tampering or unauthorized movement, triggering alarms if needed. Additionally, the device can send real-time updates via cloud connectivity, ensuring firmware stays current. The expander’s compact design allows for easy surface mounting or installation within third-party equipment. Dimension Technical Specifications Port Alarm Input 2 (1 for alarm and 1 for anti-tampering) Auxiliary Power Output 3.3 V, up to 10 mA Function Button 1 × power button Remote Update Cloud update Low Battery Detection Yes Tamper Yes Measuring Range (Temperature) –10 °C to +55 °C (+14 °F to +131 °F) (indoor) Technical Sensor Triaxial accelerometer Test Mode Yes LED Indicator 1 × green alarm indicator Scenario Indoor Operating Current 45 uA (with 1 min heartbeat, normally open mode, charge not being provided for other devices and device moved alarm not enabled) Alarm Current 50 mA Wireless Carrier Frequency 433.1 MHz–434.6 MHz Communication Mechanism Two-way Communication Distance Up to 1300 m (4265.10 ft) in an open space Encryption Mode AES128 Frequency Hopping Yes General Power Supply 3 × CR123A battery Battery Model CR123A Battery Life 5 years (4 years if the external input type is pulse) Power Consumption Max. 150 mW (without providing charge for other devices) Operating Temperature –10 °C to +55 °C (+14 °F to +131 °F) (indoor) Operating Humidity 10%–90% (RH) Product Dimensions 102 mm × 39 mm × 21.5 mm (4.02″ × 1.54″ × 0.85″) Net Weight 77 g (0.17 lb) Gross Weight 135 g (0.30 lb) Installation Surface mount, or mount inside a third-party device Certifications CE Anti-corrosion Level Basic Protection Packaging Dimensions 95 mm × 43 mm × 139 mm (3.74″ × 1.69″ × 5.47″)