As building management systems evolve, adding I/O capacity efficiently is essential for new installations, upgrades and retrofit projects. The iSMA Controlli MIX Series provides multiprotocol I/O modules designed to extend control and monitoring without adding unnecessary panel complexity. With support for BACnet and Modbus, the range can be integrated into many modern BMS architectures.

Flexible I/O Expansion for Modern Buildings

The MIX Series can be used as remote or distributed I/O, allowing additional control and monitoring points to be added where required. By combining several common input and output types within compact DIN-rail modules, the range provides a practical way to expand existing systems or support new installations.

MIX18: Compact Serial I/O Expansion

The iSMA MIX18 provides 18 onboard I/O points and communicates over BACnet MS/TP or Modbus RTU/ASCII via RS485. Its I/O mix includes universal inputs, digital inputs, digital outputs and analogue outputs, giving engineers a versatile controller extension for applications where panel space and flexibility matter.

MIX18 IP: Ethernet-Based Integration

The iSMA MIX18 IP also provides 18 onboard I/O points but adds BACnet IP and Modbus TCP/IP connectivity. Designed for remote or distributed I/O over IP, it supports Ethernet-based building control networks while retaining a flexible combination of common input and output types. It also includes Modbus gateway functionality for integrating serial Modbus devices into an IP-based architecture.

MIX38: Higher-Density I/O

For projects requiring more points, the iSMA MIX38 provides 38 onboard I/O points within one module. It combines 8 universal inputs, 12 digital inputs, 12 digital outputs and 6 analogue outputs, making it suitable for larger applications requiring a greater concentration of monitoring and control points. It communicates using BACnet MS/TP or Modbus RTU/ASCII over RS485.

Key Benefits of the MIX Series

The MIX range supports open BACnet and Modbus protocols, combines multiple I/O types within compact modules and can be used across new installations, expansions and retrofit projects. With options offering 18 or 38 onboard points, engineers can select a module that better matches the scale and communication requirements of each application. This flexibility allows the I/O configuration to be matched more closely to practical project requirements.

Beyond the MiX: More iSMA I/O Options

The MIX Series is only part of the wider iSMA Controlli I/O portfolio available from Tyrrell Products. For applications with more specific input or output requirements, additional modules provide more targeted options.

4U-4O-H IP — BACnet IP / Modbus TCP/IP
Combines four universal inputs with four digital outputs in a compact module. Manual override switches and built-in HVAC and lighting applications provide flexible local control.

4U-4A-H IP — BACnet IP / Modbus TCP/IP
Provides four universal inputs and four analogue outputs, with manual override and support for a wide range of sensor and analogue-control applications.

8UI IP — BACnet IP / Modbus TCP/IP
Provides eight universal inputs supporting temperature, voltage, resistance, current and dry-contact measurements, making it well suited to sensor-focused expansion.

8DI — BACnet MS/TP / Modbus RTU/ASCII
Provides eight digital inputs for monitoring applications, including dry-contact inputs and fast pulse counting up to 100 Hz.

Choose the Right I/O for Your Project

Whether a project requires mixed I/O, higher point density, IP connectivity or dedicated input expansion, iSMA Controlli offers multiple options for extending a BMS. Tyrrell Products can help identify the most suitable module based on the required protocols, I/O types and application.