Nexala - A Trimble Company Nexala Control Unit (NCU)

Nexala Control Unit

The Nexala Control Unit (NCU) is an approved and certified on-board condition monitoring device for the rail industry that can connect to a large number of on-board train signals and systems.

The NCU is configurable and has been designed specifically for the high reliability diagnostic application Nexala R2M.

The device has been designed to comply with the railway standard EN50155 for electronic equipment on rolling stock.

The Nexala control unit provides:

  • A modular and expandable design, with a configurable number of digital and analogue input signal modules
  • Support for an on-train system architecture with multiple NCUs, connected through Ethernet or Wi-Fi, with data communications through a master NCU
  • Timestamp and GPS position stamping of all monitored data
  • On-train data buffering when communications link is not available
  • Remote monitoring and management of software and system configuration
  • Seamless integration with the shore-based telemetry service
  • Handles the transmission of large volumes of data
  • Support for user requested downloads from TCMS, OTMR, and component controllers

Product Information

Read our solutions brochure.



July 17, 2018—Trimble announced today that Chennai Metro Rail Ltd. (CMRL), operated by the Tamil Nadu State Government and the Government of India, will implement Trimble® Nexala rail asset management solutions. Deploying the Trimble solutions will enable CMRL to improve its real-time status monitoring and analytics capability by accessing up-to-date fleet status, which can improve overall fleet availability and reliability while reducing costs and improving safety.

Feb. 21, 2018Trimble announced today that Swedish train operator SJ has chosen the Trimble® R2M real-time remote diagnostics system and Trimble C2M component condition monitoring system. 


System Interfaces & Communications Capabilities

  • Digital / Analog I/O Modules
  • GPS
  • 10/100 Base-T Ethernet (via M12 connector)
  • Modbus TCP/IP
  • RS232 / RS485
  • Isolated RS485
  • 3G modem for data communications
  • 802.11 b/g WiFi

Optional Modular Expansion

  • Profinet
  • CANopen
  • MVB (Type EMD)
  • 5 port Ethernet switch (M12 Connector)
  • LONWorks