Dahua DHI-ARM9A4-P-W2 (868) - Multi IO Radio Transmitter

The Dahua DHI-ARM9A4-P-W2 (868) transmitter is an expansion module for wireless alarm systems designed to integrate detectors and wired devices into a Dahua alarm system operating in the 868 MHz band. It acts as an interface between the wireless alarm control panel and wired equipment, allowing several traditional sensors, contacts and control outputs to be connected to a modern wireless installation.

This module offers multiple alarm inputs, accepting different detection loop configurations to accommodate various types of wired detectors. It also has local relay outputs that can be used to drive sirens, locking devices, or other external loads. 14.5 V auxiliary outputs allow some sensors or add-on modules to be powered directly from the unit.

Communication with the alarm control panel is ensured by a two-way radio link with a frequency of 868 MHz, secured by encryption and frequency hopping techniques to ensure reliable and interference-resistant transmission. This communication system allows for an extended range between the module and the compatible control panel.

The module is equipped with an Ethernet port with PoE support, making it easy to integrate network and power over existing cabling in professional installations. It supports remote firmware updates, which ensures software maintenance and compatibility with alarm system developments.

For physical security, the enclosure has an anti-tamper contact that signals any unauthorized opening or removal attempts. The module operates in temperature and humidity ranges suitable for indoor environments. The set is designed in a rugged plastic housing, with a simple wall mount for quick installation.

This module is suitable for demanding security installations where the integration of existing wired sensors is required while maintaining the advantages of a modern wireless alarm system.

Features Dahua DHI-ARM9A4-P-W2 (868) - Multi IO Radio Transmitter:

• Product Type: Multi-I/O Radio Transmitter/Receiver for Alarm System

• Model: Dahua DHI-ARM9A4-P-W2 (868)

• Use: extension of alarm inputs/outputs with integration of wired detectors and sirens to a wireless control panel

• Installation: indoor, wall mount

• Alarm Inputs: Supports 16 input channels, with pulse detection on select channels and support for 0EOL/EOL/2EOL/3EOL loops

• Alarm outputs: 4 local relay outputs up to 30 V DC, 3 A each

• Auxiliary power outputs: 2 x 14.5V outputs, up to 24W total power (1A PoE, 2A AC)

• Network port: 1 x 10/100 Mbps RJ-45 Ethernet port with PoE support (802.3at)

• Radio communication: bidirectional in 868 MHz, AES128 encryption, frequency hopping

• Transmit power: EIRP limit up to 25 mW

• Radio range: up to 1600 m in open space

• Main power: 100–240 V AC or PoE (802.3at)

• Battery: 12V, 7Ah backup battery holder (optional)

• Low Battery Detection: Yes

• Firmware update: support via cloud

• Indicators: 1 status light

• Buttons: 1 on/off switch and 1 reset button

• Power consumption: quiescent current and variable load depending on power source

• Operating temperature: -10 °C to +50 °C

• Operating humidity: 10% to 90% non-condensing

• Case Material: PC + ABS Plastic, White Color

• Protection level: IP30 (indoor use)

• Dimensions: approx. 304 mm × 235 mm × 90.8 mm

• Net weight: approx . 1.22 kg

• Certifications: CE compliant