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Hexa-AIHAI-OS Documentation

Modbus TCP

Data types

Section titled “Data types”

17 data types are available, with byte order configurable over 16, 32 or 64 bits, plus a scale factor and a unit per tag.

Addressable areas

Section titled “Addressable areas”
  • Holding registers
  • Input registers
  • Coils
  • Discrete inputs

Configuration example

Section titled “Configuration example”
source:
  type: modbus-tcp
  host: 192.168.1.50
  port: 502
  unit_id: 1
variables:
  - name: tank_temperature
    zone: holding
    address: 40001
    datatype: float32
    byte_order: big-endian
    scale: 0.1
    unit: "°C"

RTU to TCP gateway

Section titled “RTU to TCP gateway”

A Modbus RTU device wired to one of the 4 serial ports is exposed over TCP by the built-in gateway — acquisition-side configuration is then identical to a native TCP device.