Dahua DHI-ARM320-W2 Wireless Input Expander
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Vendor:
Dahua
Dahua DHI-ARM320-W2 Wireless Input Expander
SKU: DHI-ARM320-W2
Description
The Dahua DHI-ARM320-W2 is a wireless input expander for the Dahua AirShield alarm system. It lets you connect an existing third-party wired detector — a PIR, reed, smoke or panic device — and bring it into your wireless alarm, so when that detector triggers, the expander reports it to the hub over the air. It can even supply low-voltage power to the connected detector, and it runs for years on its own batteries. An AirShield hub is required and sold separately.
Key points
- Connects a third-party wired detector to the Dahua AirShield wireless system
- One alarm input plus a second input for the detector's tamper port
- Six alarm types selectable in the app: intrusion, medical, fire, emergency, gas, tamper
- Auxiliary 3.3 V output (up to 10 mA) to power the connected detector
- Encrypted two-way wireless (AES128, frequency hopping), up to 1,300 m
- Triaxial accelerometer for a device-moved alarm; tamper protection
- 4 x AA batteries for around 3 years of life; indoor; requires a Dahua AirShield hub
Delivery, warranty & returns · 3-year warranty · shipped from Australian stock
- Tracked delivery on every order. The tracking number is emailed as soon as it ships.
- Metro delivery: 2–4 business days. Regional areas may take longer. Free standard shipping over $300, flat $25 under.
- 3-year warranty on cameras and recorders, back-to-base, plus your Australian Consumer Law rights.
- 30-day returns on unopened items. Faulty on arrival? We cover return shipping.
- Genuine Australian stock. Never grey imports. Prices include GST.
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Dahua DHI-ARM320-W2 Wireless Input Expander
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All cameras, NVRs and DVRs come with a 3-year back-to-base manufacturer warranty covering defects in materials and workmanship, in addition to your rights under Australian Consumer Law. Hard drives and accessories are covered as set out in our Warranty Policy.
Standard shipping is free on all orders over $300 AUD, Australia-wide. Orders under $300 ship at a flat rate of $25, calculated at checkout. Tracking is included on every order.
You have 30 days from the day you receive your order to request a change-of-mind return. Items must be unopened, factory-sealed and in resalable condition. A 15% restocking fee applies and return postage is at your cost. Faulty or incorrectly supplied items are different: we cover the return shipping and refund or replace at no charge. Read the full Return & Refund Policy.
Metro delivery usually takes 2–4 business days after dispatch, and regional areas may take longer. You'll receive a tracking number by email as soon as your order leaves the warehouse.
01Overview
What the DHI-ARM320-W2 is
The Dahua DHI-ARM320-W2 Input Expander is the bridge between old-style wired detectors and a Dahua AirShield wireless alarm. Wire a third-party detector — such as an existing PIR, reed switch, smoke detector or panic button — into the expander, and when that detector trips it sends the signal to the AirShield hub by radio, which then raises the alarm and notifies you. It is the practical way to keep a working wired sensor while moving to a wireless system.
It is flexible about what it connects. It provides one alarm input plus a second input for the connected detector's tamper port, and in the DMSS app you choose what kind of alarm that input represents — intrusion, medical, fire, emergency, gas or tamper — so the system reacts correctly. An auxiliary 3.3 V output (up to 10 mA) can power the connected detector directly, and a triaxial accelerometer raises a device-moved alarm if the unit itself is disturbed.
On power and limits: it runs on three CR123A batteries for around five years in normal use, with a low-battery warning, and it talks to the hub over an encrypted two-way link with AES128 and frequency hopping at up to 1,300 m in open space. It is for indoor use and mounts on a surface or inside a third-party device. Like every AirShield device it needs a hub to work. It is genuine Australian Dahua stock with local 3-year warranty and support.
02Engineering
DHI-ARM320-W2 specifications
- Wireless input expander for the Dahua AirShield alarm system
- Brings a third-party wired detector (PIR, reed, smoke, panic and similar) into the wireless system
- One alarm input plus a second input for the connected detector's tamper port
- Six alarm types selectable in the DMSS app: intrusion, medical, fire, emergency, gas, tamper
- Auxiliary 3.3 V output (up to 10 mA) to power the connected detector
- Encrypted two-way wireless (AES128, frequency hopping), up to 1,200 m in open space
- Triaxial accelerometer for a device-moved alarm; tamper protection; test mode
- 4 x AA batteries, around 3 years of life (per B列 datasheet: 3 years if used 10 times a day); indoor, surface mount or inside a device; requires a Dahua AirShield hub; 3-year warranty
- Brings a third-party wired detector (PIR, reed, smoke, panic and similar) into the wireless system
- One alarm input plus a second input for the connected detector's tamper port
- Six alarm types selectable in the DMSS app: intrusion, medical, fire, emergency, gas, tamper
- Auxiliary 3.3 V output (up to 10 mA) to power the connected detector
- Encrypted two-way wireless (AES128, frequency hopping), up to 1,200 m in open space
- Triaxial accelerometer for a device-moved alarm; tamper protection; test mode
- 4 x AA batteries, around 3 years of life (per B列 datasheet: 3 years if used 10 times a day); indoor, surface mount or inside a device; requires a Dahua AirShield hub; 3-year warranty
03Full datasheet
Detailed specifications
Network & Storage
| Feature | Detail |
|---|---|
| Remote Update | Cloud update |
| 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 |
Event & Alarm
| Feature | Detail |
|---|---|
| Alarm Input | 2 (1 for alarm and 1 for anti-tampering) |
| Low Battery Detection | Yes |
| Tamper | Yes |
| Sensor | Triaxial accelerometer |
| Test Mode | Yes |
| Scenario | Indoor |
Interface
| Feature | Detail |
|---|---|
| Button | 1 × power button |
| LED Indicator | 1 × green alarm indicator |
| Auxiliary Power Output | 3.3 V, up to 10 mA |
General & Environment
| Feature | Detail |
|---|---|
| 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 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 |
| Measuring Range (Temperature) | –10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| 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") |
| Packaging Dimensions | 95 mm × 43 mm × 139 mm (3.74" × 1.69" × 5.47") |
| Net Weight | 77 g (0.17 lb) |
| Gross Weight | 135 g (0.30 lb) |
| Installation | Surface mount, or mount inside a third-party device |
| Anti-corrosion Level | Basic Protection |
| Certifications | CE |
| Network & Storage — Remote Update | Cloud update |
|---|---|
| Network & Storage — Carrier Frequency | 433.1 MHz–434.6 MHz |
| Network & Storage — Communication Mechanism | Two-way |
| Network & Storage — Communication Distance | Up to 1300 m (4265.10 ft) in an open space |
| Network & Storage — Encryption Mode | AES128 |
| Network & Storage — Frequency Hopping | Yes |
| Event & Alarm — Alarm Input | 2 (1 for alarm and 1 for anti-tampering) |
| Event & Alarm — Low Battery Detection | Yes |
| Event & Alarm — Tamper | Yes |
| Event & Alarm — Sensor | Triaxial accelerometer |
| Event & Alarm — Test Mode | Yes |
| Event & Alarm — Scenario | Indoor |
| Interface — Button | 1 × power button |
| Interface — LED Indicator | 1 × green alarm indicator |
| Interface — Auxiliary Power Output | 3.3 V, up to 10 mA |
| General & Environment — Power Supply | 3 × CR123A battery |
| General & Environment — Battery Model | CR123A |
| General & Environment — Battery Life | 5 years (4 years if the external input type is pulse) |
| General & Environment — Power Consumption | Max. 150 mW (without providing charge for other devices) |
| General & Environment — Operating Current | 45 uA (with 1 min heartbeat, normally open mode, charge not being provided for other devices and device moved alarm not enabled) |
| General & Environment — Alarm Current | 50 mA |
| General & Environment — Measuring Range (Temperature) | –10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| General & Environment — Operating Temperature | –10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| General & Environment — Operating Humidity | 10%–90% (RH) |
| General & Environment — Product Dimensions | 102 mm × 39 mm × 21.5 mm (4.02" × 1.54" × 0.85") |
| General & Environment — Packaging Dimensions | 95 mm × 43 mm × 139 mm (3.74" × 1.69" × 5.47") |
| General & Environment — Net Weight | 77 g (0.17 lb) |
| General & Environment — Gross Weight | 135 g (0.30 lb) |
| General & Environment — Installation | Surface mount, or mount inside a third-party device |
| General & Environment — Anti-corrosion Level | Basic Protection |
| General & Environment — Certifications | CE |
04Why choose this
Built for the way you actually use the DHI-ARM320-W2
Right alarm, every time
Choose from six alarm types in the app so the connected detector is handled correctly, from intrusion to fire or medical.
Powers the detector too
An auxiliary 3.3 V output can supply a small connected detector directly, simplifying the wiring.
Years of battery life
Around five years on three CR123A cells with a low-battery warning keeps maintenance to a minimum.
05Where it fits
Right at home in these scenarios
Reuse existing wired sensors
Connect a working wired PIR or reed when upgrading a property to the AirShield wireless system.
Add specialist detectors
Bring a wired smoke, gas or panic device into the alarm and label it with the matching alarm type.
Hard-to-reach zones
Cover a point that is already wired but far from the hub, with the signal carried the rest of the way wirelessly.
Mixed wired and wireless sites
Blend legacy wired detection with new wireless devices on one AirShield hub.
06Setup
Installation & setup
-
01
What's in the box
One DHI-ARM320-W2 input expander with 3 x CR123A batteries. A Dahua AirShield hub is required and not included; the third-party wired detector is connected separately.
-
02
Installation requirements
Mount the expander on a surface or inside the third-party device, wire the detector to the alarm input and its tamper to the second input, and use the 3.3 V output if the detector needs power. Enrol the expander to your AirShield hub in the DMSS app, set the alarm type for the input, and use the test mode to confirm a reliable two-way signal before arming.
08Questions
Frequently asked about the DHI-ARM320-W2
Q.01
What does the ARM320-W2 input expander do?
It connects a third-party wired detector to a Dahua AirShield system. When the wired detector triggers, the expander relays the signal to the AirShield hub wirelessly, so an existing sensor can become part of your wireless alarm without running cable back to the hub.
Q.02
Does it work without an AirShield hub?
No. It reports to a Dahua AirShield hub, so it needs one to function. Enrolled to a hub, the wired detector you connect behaves like any other AirShield zone.
Q.03
What can I connect to it?
Common wired detectors such as a PIR, a reed or door contact, a smoke detector or a panic button. It gives one alarm input plus a second input for that detector's tamper connection, and you set the alarm type in the app.
Q.04
What are the six alarm types?
In the DMSS app you can configure the input as intrusion, medical, fire, emergency, gas or tamper, so the connected detector is treated correctly by the system and the right kind of alert is raised.
Q.05
Can it power the detector it is connected to?
Yes. It has an auxiliary 3.3 V output rated up to 10 mA, which can supply a small low-voltage detector directly, so you may not need a separate power source for it.
Q.06
How long do the batteries last?
It runs on three CR123A batteries for around five years in normal use, or about four years if the connected input is a pulse type, with a low-battery warning before they run out.
Q.07
Is it protected against tampering?
Yes. It has a tamper input for the connected detector and a built-in triaxial accelerometer that raises a device-moved alarm if the expander itself is disturbed, so interference is reported to the hub.
Q.08
Is this genuine Australian Dahua stock?
Yes. It is supplied as genuine Australian Dahua stock with local 3-year warranty and support, and it pairs with the AirShield hubs and peripherals sold here.
Buying from Smarket
Is your Hikvision, Dahua, HiLook and TP-Link VIGI stock genuine Australian stock?
Yes, 100%. Every Hikvision, Dahua, HiLook and TP-Link VIGI product we sell is a genuine Australian-market model sourced through Australian supply chains — never grey imports. That means factory-sealed units, Australian-region firmware that works with the official apps out of the box, and a full 3-year local warranty.
How long does delivery take?
Metro delivery usually takes 2–4 business days after dispatch, and regional areas may take longer. You'll receive a tracking number by email as soon as your order leaves the warehouse.
How much is shipping?
Standard shipping is free on all orders over $300 AUD, Australia-wide. Orders under $300 ship at a flat rate of $25, calculated at checkout. Tracking is included on every order.
What warranty do you offer?
All cameras, NVRs and DVRs come with a 3-year back-to-base manufacturer warranty covering defects in materials and workmanship, in addition to your rights under Australian Consumer Law. Hard drives and accessories are covered as set out in our Warranty Policy.
What is your return policy?
You have 30 days from the day you receive your order to request a change-of-mind return. Items must be unopened, factory-sealed and in resalable condition. A 15% restocking fee applies and return postage is at your cost. Faulty or incorrectly supplied items are different: we cover the return shipping and refund or replace at no charge. Read the full Return & Refund Policy.
Do you offer installation?
We can connect you with licensed installers in Sydney and Melbourne. Installation typically starts from around $200 per camera depending on cable runs and site conditions. Email sales@smarket.com.au with your address and camera count for a quote.
10Bundles
Recommended packages
Pair it with an AirShield hub (required)
The expander needs a hub to work — build your system on the DHI-ARC3000H-FW2 hub, or the larger DHI-ARC3800H-FW2 Alarm Hub 2.
Add wireless detection too
Mix in native wireless detectors such as a ARD1233-W2 PIR detector or a ARD324-W2 door detector alongside your wired ones.
Make alarms heard
Add an ARA12-W2 indoor siren or ARA13-W2 outdoor siren so a triggered alarm is loud inside and out.
Extend wireless range
If the expander sits far from the hub, add an ARA43-W2 repeater to strengthen the link.