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MIX series of I/O modules with RS485 and IP (2x Ethernet) have been designed for building distributed control systems using MAC36, AAC20 or another controller. Each MIX module is equipped with the most commonly used types od I/O in building automation. Depending on the version, the device will have 18 or 38 inputs and outputs, a mix of all types of I/O in one unit. All I/O modules have BTL and UL certificates.

The modules with RS485 and IP (2x Ethernet) are factory-equipped with the two most popular open communication protocols: Modbus (ASCII, RTU, TCP/IP) and BACnet (MSTP, IP), which are selected using DIP switches. Rotary switches are used to set the module address, which facilitates and accelerates the process of commissioning the system. Built-in mini USB allows for the initial configuration of the unit without external power supply.

Built-in Modbus Gateway TCP/IP to Modbus ASCII/RTU, enables to connect additional modules/devices that communicate via Modbus RS485.

Thanks to supporting open communication standards MIX modules can be installed in both new and completed installations, as part of existing BMS. This versatile device will fit any BMS perfectly.

Technical data


  • 8x Universal Inputs (8UI)
  • 12x Digital Inputs (12DI)
  • 6x Analog Outputs (6AO)
  • 12x Digital Outputs (12DO)


  • ARM Cortex-M3


  • Interface RS485 half-duplex
  • Up to 99 devices on the bus
  • Protocols: Modbus or BACnet
  • Baud rate: 2400 to 115200 bps

Power supply

  • 24 V AC/DC



iSMA-B-AAC20 Modbus Async Network and iSMA Modules

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