Qt ModbusΒΆ

Implemented Qt Modbus.

Modbus is a request/reply protocol that has one Modbus client in its network and may have many Modbus servers. Servers can control only their own internal states, and clients can read and write data in them.

Each Modbus server has four tables in which it can store data.

name

data range in one field

permissions for client

Discrete Inputs

0-1

Read

Coils

0-1

Read/Write

Input Registers

0-65535 (0xffff)

Read

Holding Registers

0-65535 (0xffff)

Read/Write

The Modbus API provides some common API to access the Modbus devices: