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:
QModbusDevice
provides an API for common functionality with client and server.
QModbusClient
provides an API for direct access to Modbus client.
QModbusServer
provides an API for direct access to Modbus server.
QModbusDataUnit
represents a data value.
QModbusReply
is created byQModbusClient
as a handle for write/read operation.