Dahua DHI-ARM310-W2 Wireless Input Expander

Model: DHI-ARM310-W2

Who This Is For

For alarm installers and integrators who need to bring existing wired sensors into a Dahua wireless alarm system without pulling new cable runs, the DHI-ARM310-W2 Wireless Input Expander is a practical bridging device. It accepts 2 wired alarm inputs - supporting normally closed or normally open configurations - and transmits their status wirelessly over 433 MHz RF to a compatible Dahua alarm hub. That makes it directly useful on retrofit jobs where a property already has hardwired PIRs, door contacts, or smoke detectors that the client wants to keep. With a stated open-space range of up to 1,000 metres and two-way communication using frequency hopping, it suits installations where the hub and sensor locations are separated by walls, floors, or outbuildings. Battery-powered via a single CR123A cell rated for up to 4 years, it avoids the need for a local power source at the sensor end.

What This Device Actually Does

Who Buys This Model

• Alarm installers on retrofit jobs: Sites with existing hardwired PIRs or door contacts that the client wants retained when upgrading to a Dahua wireless alarm hub - the 2 wired inputs handle NO/NC sensors directly.
• Integrators covering outbuildings or detached structures: Sheds, garages, or storage areas where running cable back to the main panel is impractical - the 1,000 m open-space RF range covers the gap wirelessly.
• Installers needing a local relay trigger: Applications where a wired output at the sensor location - such as a local siren or strobe - needs to activate on alarm, using the onboard NO/NC relay output.
• Security system specifiers expanding Dahua wireless alarm systems: Adding input capacity to an existing Dahua wireless hub without replacing sensors already in place on-site.

Honest Assessment

The DHI-ARM310-W2 does a specific job well: it bridges up to 2 wired alarm inputs into a Dahua wireless alarm system, removing the need to replace working hardwired sensors on a retrofit. The two-way 433 MHz communication with frequency hopping is a meaningful step up from simpler one-way wireless expanders, providing jamming alerts and transmission confirmation rather than silent failure. Battery life rated at up to 4 years keeps ongoing maintenance low. Where this unit has limits: it provides only 2 inputs, so larger sites with many wired sensors will need multiple units, which adds cost and RF management overhead. It is designed specifically for the Dahua wireless alarm ecosystem and will not function as a standalone device or integrate with third-party alarm panels. For sites requiring a large number of hardwired zones, a wired expander connected to a Dahua wired or hybrid panel may be a more cost-effective path. Available through Security Australia, this expander suits installers already committed to the Dahua wireless alarm platform.

Before You Buy

Quick Fit Check

• Good match if: You are retrofitting a Dahua wireless alarm system onto a site with 1-2 existing hardwired NO/NC sensors that the client wants to keep in service, avoiding a full sensor replacement.
• Good match if: The wired sensors are located in a detached structure away from the main alarm hub and running new cable is not feasible - the 433 MHz RF link with frequency hopping covers the distance wirelessly.
• You may need a different model if: The site has more than a small number of hardwired zones to integrate - a Dahua wired or hybrid alarm panel with dedicated wired input modules will handle high zone counts more efficiently and at lower per-zone cost.

Key Features & Technical Specifications

Real-World Scenarios

How It Compares

• Choose this if: You need to integrate 1-2 existing hardwired NO/NC sensors into a Dahua wireless alarm system without replacing them, using a battery-powered device that requires no local mains power at the sensor location.
• You may need a different model if: The site has a large number of hardwired zones to integrate - a Dahua wired or hybrid alarm panel with dedicated multi-zone wired input modules will cover high zone counts at lower per-zone cost and without the RF management overhead of multiple wireless expanders.
• Pairs well with: A compatible Dahua wireless alarm hub and Dahua wireless sensors to build out a complete mixed wired-and-wireless alarm system under a single platform.

Common Questions

1. Will this work with any alarm panel, or only Dahua systems?

   Only Dahua wireless alarm systems. The DHI-ARM310-W2 communicates over the Dahua proprietary 433 MHz RF protocol and is not designed to pair with alarm hubs from other manufacturers. If your existing panel is a non-Dahua system, this expander will not integrate with it.

2. How many wired sensors can I connect to one DHI-ARM310-W2?

   2 wired inputs per unit. Each input accepts a standard normally open or normally closed sensor connection. If you have more than 2 hardwired sensors to integrate, you will need additional expander units - one per 2 sensors. Factor this into your system design and RF channel plan accordingly.

3. Does this expander work for fire and medical alarm inputs, not just intrusion?

   Yes. The DHI-ARM310-W2 supports intrusion, fire, medical, gas, and tamper alarm input types. The input zone type is configured in the Dahua DMSS app during setup, which determines how the hub classifies and reports the triggered zone.

4. Does it need mains power, or does it run entirely on battery?

   It runs entirely on battery. A single CR123A cell powers the unit, rated for up to 4 years under normal operation. No mains power connection is required, which makes positioning flexible. The unit reports low-battery status back to the hub before the battery is fully depleted.

5. What does the relay output actually do?

   It provides a single wired NO/NC output that the hub can command to switch. In practice, this means you can connect a local wired device - such as a siren, strobe, or access control trigger - at the expander's location, and the hub can activate it remotely over the RF link when an alarm condition is met.

6. How do I verify the signal quality before finalising the installation position?

   Use the Dahua DMSS app's signal strength detection feature. The DHI-ARM310-W2 includes an onboard test mode specifically for this purpose - you can check signal quality at the intended mounting location before securing the device, avoiding a situation where signal drops out after installation is complete. The team at Security Australia can advise on hub compatibility if you are unsure which model supports this expander.

7. Will the system alert me if someone tries to jam the wireless signal?

   Yes. Jamming detection is a confirmed feature of the DHI-ARM310-W2. Because the device uses two-way communication, the hub can detect when RF communication is being disrupted and generate a tamper or fault alert. This is a meaningful advantage over simpler one-way wireless expanders that cannot report communication loss.

Downloads & Resources

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