I/O module with Modbus RTU/ASCII or BACnet MSTP communication- 4DO NONC- max. 8A relay with hand operating
Manufacturer: iSMA Controlli
Delivery date: 1-2 days
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The module iSMA-B-4O-H has 4xDO (Digital Outputs). DO are NC/NO relay outputs 230 V AC/30 V DC max. 8 A.

The module is factory-equipped with the two most popular open communication protocols: Modbus ASCII/RTU and BACnet MSTP, which are selected using DIP switches.

Addressing the modules is via rotary switches, which facilitates and accelerates the process of commissioning the system.

Built-in mini USB allows for initial configuration of the unit without power supply.

4x Digital Outputs (4DO)
  • Relay output (NC/NO) max. 8 A, 230 V AC/30 V DC
  • 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
  • Dimension: 37x110x62 mm (1.457 x4.331×2.441 in)
  • Construction: plastic, self-extinguishing (PC/ABS)
  • DIN rail mounting (DIN EN 50022 norm)
  • Cooling: internal air circulation
  • Operating temperature: -10°C to 50°C (14°F to 122°F)
  • Storage temperature: -40°C to 85°C (-40°F to 185°F)
  • Relative humidity: 5 to 95%, no condensation
  • Ingress Protection Rating: IP40 – for indoor installation


  Installation Instruction

  Manual BACnet

  Manual Modbus

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