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Rayleigh Instruments RI-EX-PRO 128 Device Ethernet Communication Gateway


  • Compact size - 2 module (35mm width) DIN Rail mounting
  • RS485 Modbus RTU TCP master
  • Connect up to 128 x Modbus devices
  • 10/100Mbps Ethernet connection
  • 1 x Relay Output
  • 5VDC Auxiliary Supply
  • USB-C port for device configuration, diagnostics and firmware update
  • DHCP or Static IP address
  • 1MB Built-in flash memory (8Mbit) for settings and data storage


The RI-EX-PRO Series are robust and easy-to-use DIN rail mounted data acquisition communication gateways.

The RI-EX-PRO Series form part of a growing family of gateway devices designed to be used with the rayleighconnect™ cloud-based software platform.

The RI-EX128 Pro accepts inputs from up to one hundred and twenty-eight Modbus devices via RS485 Modbus RTU.

The data from all devices is transmitted to the rayleighconnect™ cloud software platform via the built-in RJ45 Ethernet port to your router. If Modbus TCP devices are required to be connected via the RJ45 Ethernet port then a separate network switch is required.

Additional Information

Manufacturer Rayleigh Instruments


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