Dahua DHI-ARM320-W2 (868) - Radio Transmitter

The Dahua DHI-ARM320-W2 (868) transmitter is a wireless radio expansion module for Dahua alarm systems. It allows wired detectors and external devices to be connected to a wireless alarm hub, providing easy integration for hybrid installations. It is designed for indoor use, with wall mounting or integration into a third-party enclosure.

The module has two alarm inputs (one for the alarm and one for the tamper contact) and a 3.3 V auxiliary output for powering small external detectors. It is equipped with a built-in accelerometer that triggers an alarm in the event of unauthorized movement and can detect overheating. The module also measures the ambient temperature in the range of -10 °C to +55 °C.

Communication with the alarm hub is via a two-way 868 MHz radio link, with AES128 encryption and frequency hopping to ensure reliability and security. The radio range can reach about 1600 m in free space. The module has an LED indicator light to indicate status and a function button for turning on or resetting.

Power is provided by three CR123A batteries, offering a battery life of up to 5 years depending on use. Power consumption is approximately 150 mW in operation. The device operates in a temperature range of -10 °C to +55 °C and a humidity of 10% to 90% without condensation. The dimensions are about 102 mm × 39 mm × 21.5 mm and the net weight is about 77 g.

Features Dahua DHI-ARM320-W2 (868) - Radio Transmitter:

• Product type: Wireless radio expansion module for alarm system

• Model: Dahua DHI-ARM320-W2 (868)

• Use: connect wired detectors and external devices to a wireless alarm hub

• Installation: indoor, wall mounting, or integration into an enclosure

• Alarm inputs: 2 (1 alarm, 1 tamper)

• Auxiliary output: 3.3 V up to 10 mA for small detectors

• Built-in accelerometer: triggers alarm in case of unauthorized movement

• Overheat detection: yes

• Temperature measurement: -10 °C to +55 °C

• Radio Communication: Bidirectional, 868MHz Frequency, AES128 Encryption, Frequency Hopping

• Radio range: up to 1600 m in free space

• LED indicator: 1 status light

• Function button: 1 on/reset button

• Power supply: 3 x CR123A batteries

• Battery life: up to 5 years depending on use

• Power consumption: approx. 150 mW

• Operating temperature: -10 °C to +55 °C

• Operating humidity: 10% to 90% non-condensing

• Dimensions: 102 mm × 39 mm × 21.5 mm

• Net weight: 77 g