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Modbus RTU

All gateways support Modbus RTU over RS-485 in master mode.


  • Supported baud rates: 2400, 4800, 9600 ​(default)​, 19200, 38400, 57600, 115200
  • Supported modes: 8N1 ​(default)​, 8O1, 8E1, 8N2

Data acquistion


The below describes advanced capabilities of the gateways. In practice, configuring data acquistion is done by selecting a device model and interval from a dropdown on rayleighconnect™ cloud platform.

The gateway can be programmed to autonomously read a set of registers.

Reading interval can be configured:

  • independently for each slave device
  • independently for each group of registers (supported only on RI-EC128-PRO)

If required gateway can send initialization commands (eg. write to a register) before reading.

Up to 128 slave devices can be conntected to a single gateway.

RegOp commands

All gateways support sending complex Modbus commands.

Programmable actions

Data read from Modbus registers can be used in programmable actions.

See XVM for more information.