Ajax MultiTransmitter Black Wired-to-Wireless Integration Module (18 Zones)

Ajax MultiTransmitter Black – 18-Zone Wired Integration Module

The Ajax MultiTransmitter is an integration module that lets you bring existing third-party wired detectors and devices into a modern Ajax wireless security system. Rather than ripping out an old wired alarm installation, this module connects up to 18 wired zones back to an Ajax hub via the encrypted Jeweller radio protocol, giving legacy sensors app control, automations, and real-time notifications.

Key Features

• 18 wired zones supporting NC, NO, EOL, 2EOL, and 3EOL connection types depending on firmware version
• Wired cable runs of up to 400 metres per zone, ideal for large or multi-building sites
• Communicates with a compatible Ajax hub over the Jeweller radio protocol at ranges up to 2,000 metres in open space
• Three dedicated 10.5–15V power lines, including one isolated line reserved for fire detectors requiring a power reset after activation
• Dual tamper protection that triggers if the casing is removed from its mounting surface or the lid is opened
• Mains-powered (100–240V~) with a 12V backup battery that can keep connected devices running for up to 4 days during a power outage
• All wireless communication is secured with dynamic-key block encryption and frequency hopping to resist jamming
• Remote configuration, firmware updates, and zone management handled entirely through the Ajax app
• Compact black enclosure designed to fit into an optional Ajax Case for concealed or tidy installation

Where It's Used

The MultiTransmitter is best suited to alarm renovation projects where a site already has wired detectors, cable runs, or door/window contacts that installers want to keep in service. It is commonly used to modernise commercial premises, retail fitouts, or larger residential properties that have existing wired infrastructure but want to add Ajax's app-based monitoring, automations, and multi-site management without a full rewire. It also supports connecting devices such as PIR barriers, gas and flood sensors, thermostats, and wired keypads that aren't natively part of the Ajax wireless range.

What's in the Box

• Ajax MultiTransmitter module (black)
• Power supply cable
• Screw terminal block
• Installation and mounting kit
• Quick start guide

Frequently Asked Questions

Can the MultiTransmitter be used outdoors?
No, it is designed for indoor installation only, though the wired detectors it connects to may be located outdoors or in unprotected areas.

How many detectors can I connect?
It provides 18 wired zones, and multiple detectors can share a single zone depending on their combined power draw, as total current across all zones is limited to 1A.

Which Ajax hubs is it compatible with?
It works with Ajax Hub, Hub Plus, Hub 2, and Hub 2 Plus, provided the hub is running a firmware version that supports the required connection types (2EOL/3EOL needs OS Malevich 2.13 or later).

Additional Resources

• More info