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The iSMA-B-AAC20 is an advanced control device for building automation and HVAC systems. Using the SVM (Sedona Virtual Machine) allows the user to program quickly and easily in real time.


Numerous inputs and outputs allow integration with other devices and sensors (8xUI, 4xDI, 4/6xAO and 4xDO). The readable and fully programmable LCD can be used as a simple user interface during the local operation of the system. With the built-in RS485, we can expand the number of I/Os by connecting MINI or MIX series I/O modules using Modbus ASCII / RTU. In addition, to increase the versatility of the controller, it supports several open communication protocols: BACnet, Modbus, SOX, DALI, M-Bus, 1-Wire or oBIX.


The AAC20 can be installed in the device housing and mounted on a DIN rail or directly on a panel. Separate, easily removable connectors allow quick wiring without removing the entire module.


Main features:

  • Sedona Framework 1.2 support

  • Real Time Clock (RTC)

  • Web configuration

  • 2x Fast Ethernet, built-in switch

  • RS485 port (Modbus or BACnet)

  • Built-in Modbus gateway, TCP/IP - RS485

  • DALI Interface: built-in power supply (optional)

  • M-Bus Interface: up to 20 devices (optional)

  • 1-Wire Interface

  • USB Host Interface

  • iSMA Tool - free programming software

  • Built-in LCD display (optional)

  • Micro SD card slot  for recording data history and alarms

  • Fast ARM processor   with two cores  204MHz



8x Universal Input (8UI)

All universal inputs have 16-bit resolution, supporting the following input types:

  • Temperature input supports the following sensors: 10K3A1, 10K4A1, Carel 10K, 20K6A1, 2.2K3A1, 3K3A1, 30K6A1, SIE1, TAC1, SAT1, Pt1000, Ni1000

For Pt1000 and Ni1000, use only 16-bit resolution!

  • Voltage input  0-10 V DC: input resistance 100 kΩ ±0.1% accuracy,  measurement resolution 3 mV @ 12-bit and 1 mV @ 16-bit

  • Current input  0-20 mA (499 Ω external resistor required)

  • Resistance input 0-1000 kΩ measurement resolution at 20 kΩ load  20 Ω @ 12-bit and 1 Ω @ 16-bit

  • Voltage-free contact inputs

4x Digital input (4DI)

  • Voltage-free contacts

  • Fast pulse counter up to 100 Hz  save to  EEPROM memory

4/6x Analog output (4/6AO)

All analog outputs are equipped with a 12-bit ADC, providing 10 mV resolution and ±0.5% accuracy. The following output types are supported:

  • Output: 0-10 V DC maximum load up to 20 mA (AO6- 5 mA)

  • PWM: 0.01Hz, 0.1Hz, 1Hz, 10Hz, 100Hz

AO5 and AO6 can only be used when the 1-Wire port is not in use, please note that the maximum current load of AO6 is 5 mA.

4x Digital outputs (4DO)

  • Relay outputs (NO): max. 3 A, 230 V AC/30 V DC


  • RS485 half-duplex

  • Baud rate: 2400 - 115200 bps

  • 2x Ethernet,  built-in switch (DHCP, Auto IP)

  • DALI Interface: built-in power supply 130 mA (optional)

  • M-Bus Interface: up to 20 devices (optional)

  • 1-Wire Interface

  • Micro SD card slot

  • USB Host Interface


  • Modbus RTU/ASCII/IP

  • BACnet MSTP/IP

  • SOX

  • oBiX

  • SONG

  • 1-Wire

  • M-Bus

Power supply

  • 24 V AC/DC

Device housing

  • Dimensions: 106x110x62 mm (4.18x4.34x2.44 in)

  • Construction: UL approved, self-extinguishing plastic (PC/ABS)

  • Can be mounted on a DIN rail  DIN (DIN EN 50022)

  • Cooling: internal air movement


  • Operating temperature: -10°C to 50°C (14°F to 122°F)

  • Storage temperature: -40°C-   85°C (-40°F - 180°F)

  • Relative humidity: 5% - 95%, non-condensing

  • Protection class: IP40 - for indoor installation

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