AirShield Multi-Transmitter: connect many wired zones wirelessly
With the AirShield Multi-Transmitter, you bring an entire wired installation into your AirShield system. Existing detectors and sirens stay in place, and you connect them wirelessly to the hub in one go. This way you modernise without replacing everything.
This module (Dahua DHI-ARM9A4-W2(868)) has 16 alarm inputs and 4 relay outputs. Wired detectors pass their signal on to the hub, and the hub can, for example, control an existing siren via the relays. Useful for larger or professional installations.
Why choose the AirShield Multi-Transmitter
16 zones at once
Connect up to 16 wired detectors (with pulse detection on channels 1 to 6) and include your entire installation in the wireless AirShield system.
4 relay outputs
Four relays up to 30 VDC and 3 A to control external devices or an existing siren, plus 2 auxiliary power supplies of 14.5 V (up to 2 A combined).
Encrypted and monitored
Two-way communication on 868 MHz with AES128 and frequency hopping, with tamper contact, battery monitoring and a range of up to approx. 1,600 metres.
Mains power with backup
Runs on 100 to 240 VAC and can be prepared for an optional 12 V backup battery, so the system keeps working during a power failure.
Product photos
Technical specifications
| Connection | |
| Inputs | 16 alarm zones (pulse detection on channels 1 to 6) |
| Outputs | 4 relays, up to 30 VDC / 3 A |
| Backup power supply | 2x 14.5 V, up to 2 A combined (overload and short-circuit detection) |
| Wireless | |
| Frequency | 868 MHz |
| Communication | Two-way, AES128 encrypted, with frequency hopping |
| Range | Up to approx. 1,600 m in open field |
| Security | Tamper contact, battery monitoring and cloud updates |
| General | |
| Power supply | 100 to 240 VAC, with optional 12 V backup battery (not included) |
| Environment and mounting | Indoor use, wall mounting |
| Model | Dahua DHI-ARM9A4-W2(868) |
Which interface module suits you?
Do you want to bring existing wired detectors or sirens into your AirShield system? For 1 individual detector, the compact Input Expander is enough. The Transmitter connects individual external detectors with a tamper input. For many zones at once, choose the Multi-Transmitter, or the PoE variant if you prefer a neat connection via a network cable.
| Model | Inputs | Outputs | Connection | Power supply | Ideal for |
|---|---|---|---|---|---|
| Input Expander | 1 wired zone | None | Wireless 868 MHz | 1x CR123A-batterij | Make 1 individual wired detector wireless |
| Transmitter | 2 (alarm + tamper) | 3.3 V auxiliary output | Wireless 868 MHz | 3x CR123A-batterij | Pair separate external detector(s) |
| Multi-Transmitter | 16 zones | 4 relays | Wireless 868 MHz | 100-240 VAC + optional battery | Many wired zones and sirens |
| PoE Multi-Transmitter | 16 zones | 4 relays | 868 MHz or Ethernet | PoE or 100-240 VAC | Neat cabling via the network |
All four communicate wirelessly on 868 MHz with two-way communication and AES128, and connect to the AirShield hub. The Multi-Transmitters run on mains power; the Input Expander and Transmitter run on CR123A batteries.
Pairing and management
Everything in the DMSS app
You pair and manage this extension in the free Dahua DMSS app. There you can see the status, change settings and receive notifications on your phone. No subscription required, on iPhone and Android.
No AirShield system yet?
This extension works with the wireless AirShield hub from Dahua. Put your system together with the configurator, or have everything installed by our VEB-approved installers.
Frequently asked questions
What is the difference from the PoE version?
This one works wirelessly on 868 MHz and on mains power. The PoE Multi-Transmitter can also be connected to the network by cable and powered via PoE, using a single network cable.
Can I also connect a siren to this?
Yes. The hub can, for example, control an existing wired siren via the 4 relay outputs.
Does it keep working during a power failure?
The module runs on mains power and can be prepared for an optional 12 V backup battery. We supply the Multi-Transmitter battery 12V 9Ah for this.
Who is this module intended for?
For larger or professional installations with many wired zones. For 1 or a few detectors, the Input Expander or Transmitter is more economical.
In the box
AirShield Multi-Transmitter
The module itself.
Mounting materials
For wall mounting.
Documentation
Manual.
The optional 12 V backup battery is not included. We supply it as the Multi-Transmitter battery 12V 9Ah.
