UART Bridge Module Ajax 000001160 — RS-485 communication interface

Ajax uartBridge is a module for integrating Ajax wireless detectors into third-party security and smart home systems via a UART interface. The device converts signals between the Ajax Jeweller radio network and UART, enabling connection to RS-485 controllers and other peripherals when used with appropriate converters. It supports long-range wireless communication and provides monitoring data for each connected detector.

Advantages

Jeweller radio technology provides reliable wireless links up to 2,000 meters in open space and across several floors, with support for up to 85 devices. The module employs authentication, encrypted communication and frequency hopping to protect against fraud and jamming, and it monitors detector performance, battery level and alarm states. Operation uses a UART interface at 57,600 Bd and the module receives power from the UART connection (DC 5 V), simplifying installation and integration into professional systems.

Suitable for

• Integrating Ajax wireless detectors into third-party security panels and smart home controllers
• Connecting Ajax networks to RS-485 systems via UART-to-RS-485 converters
• Commercial and residential installations requiring remote detector placement across floors or large open areas

Key specifications

• Communication interface with central unit: UART (speed 57,600 Bd)
• Use: Indoor
• Radio signal power: 25 mW
• Communication protocol: Jeweller (868.0–868.6 MHz)
• Maximum distance between a wireless detector and uartBridge receiver: up to 2,000 m (6,552 ft) in open area
• Maximum number of connected devices: 85
• Detection of jamming: Yes
• Software update: Yes
• Detector performance monitoring: Yes
• Power supply voltage: DC 5 V (from the UART interface)
• Operating temperature range: −20°C to +50°C (−4°F to +140°F)
• Operating humidity: up to 90%
• Dimensions: 64 × 55 × 13 mm (without antennas); 110 × 58 × 13 mm (with antennas)

How to use

Connect the uartBridge to the host controller via the UART interface configured at 57,600 Bd and, if required, add a UART-to-RS-485 converter to link with RS-485 networks. Place the module indoors within range of the Ajax detectors and ensure it receives 5 V DC from the UART connection. Register the module in the host system according to the controller’s integration procedure so that detector statuses, alarms and battery levels are transmitted and monitored.

Usage recommendations

Install the module in a location with minimal RF obstacles and keep antennas positioned according to the manufacturer’s guidance to achieve the stated 2,000 m line-of-sight range. Use proper grounding and follow RS-485 wiring practices when converting the UART output for differential transmission. Ensure firmware updates are applied to maintain compatibility and security.