General
Sensor type	4-pole relay with ON contacts 250V/10A
Chip	PCF8574
Connection	2x RJ45 (I2C bus)
Multiplexing	adjustment knob for ID
LED indicators	1x PWR, 1x BUS, 4x contact output
Housing	Metal housing
Operation temperature	-45 ~ 90 °C
Operating air humidity	10 ~ 85 % (non-condensing)
Storage temperature	-20 ~ 60 °C
Storage humidity	5 ~ 90 % (non-condensing)
Marking	CE, RoHS
Packaging contents	1x ALL4427 4-pole relay, 1x 1m connection cable

The Allnet ALL4427 is a 4-port relay output for home automation, designed in a robust aluminium housing and intended for controlling electrical loads such as lighting, pumps or other devices with a maximum current requirement of up to 10 amperes per relay. The switching contacts support a voltage of up to 250 volts, enabling use in demanding applications. The device is specifically developed for integration into IP-based building automation systems and operates using I2C bus technology via two RJ45 connectors, allowing easy connection to existing networks. Compatibility includes models from the ALL34xx/3500/4500/5000 series, but it is no longer compatible with the older ALL3000 and ALL4000 models.

Applications

The ALL4427 is suitable for controlling various electrical loads in buildings, such as lighting systems, heating or air conditioning systems, pumps or electric locking mechanisms. Use in industrial or commercial environments is possible due to its robust construction and high operating temperature range of -45 to 90 °C. The integrated wall mounting bracket allows flexible installation on walls or in enclosures, making the module suitable for both residential and commercial installations.

Functions and Equipment in Detail

The module features four independent relay outputs with normally open contacts, each capable of switching up to 250 V/10 A. Control is achieved via an I2C bus connected through two RJ45 sockets. An adjustment knob allows individual ID assignment for multiplexing, enabling multiple modules to be operated on a single line. This increases the number of controllable loads without additional cabling. LED indicators for power supply (PWR), bus status (BUS), and the four contact outputs provide visual monitoring of the operating status.

Technology Explained Simply

I2C technology (Inter-Integrated Circuit) is a serial bus used for communication between electronic components. In the case of the ALL4427, it is used to transmit control signals from a central unit (e.g. ALL3500v2) to the relay module. The use of RJ45 connectors enables easy integration into existing networks, as these connectors are widely available. Multiplexing via the adjustment knob allows multiple identical modules to be operated on a common line, with each module addressed by a unique ID.

Compatibility and Accessories

The ALL4427 is compatible with control centres from the ALL34xx/3500/4500/5000 series, such as the ALL3419, ALL3500v2 or ALL5000v2. These control centres serve as central units for building automation and enable central control of multiple relay modules. Connection is made via I2C bus, allowing decentralised control of loads. The control centres offer different numbers of sensor ports and features, such as WLAN support or temperature sensors, to adapt the automation solution to specific requirements.

Installation and Mounting

Mounting is performed using the integrated wall mounting bracket, which allows secure attachment to walls or within enclosures. Wiring is done via the two RJ45 connectors, supplied with a 1 metre long connection cable. Installation requires no special tools, as the mounting bracket is directly attached to the rear of the housing. The operating temperature range of -45 to 90 °C and humidity of 10 % to 85 % (non-condensing) make the module suitable for use in environments with extreme conditions.

Operational Advantages

The module provides reliable and maintenance-free control of electrical loads. The robust aluminium construction protects against mechanical influences and allows use in harsh environments. The multiplexing function reduces the number of required cables and simplifies installation. The LED indicators facilitate diagnostics during operation, as the status of power supply, bus and individual relays is clearly visible. Compatibility with various control centres from the ALL34xx/3500/4500/5000 series offers flexibility in system selection.

The delivery includes the ALL4427 4-channel relay module and a 1 metre long connection cable. The packaging does not contain any additional components, such as tools or documentation, unless explicitly stated.