Class IoT::Modbus::RTU::RTUDevicePort

File Information

Library: IoT/Modbus/RTU
Package: RTU
Header: IoT/Modbus/RTU/RTUDevicePort.h

This class implements the Modbus RTU protocol over a serial line.

Member Functions: address, checkFrame, decodeFrame, frameSlaveOrUnitAddress, isConnected, poll, receiveFrame, sendFrame

Creates a RTUDevicePort using the given SerialPort.

The recommended value for frameTimeout is 10ms.

The SerialPort must be open and properly configured for RS-485 communication with the Modbus slaves.

Destroys the RTUDevicePort.

std::string address() const;

Returns the client device name.

template < class Message > void decodeFrame(
Message & message
);

Decodes the currently buffered Modbus RTU frame.

The raw frame must have been read from the wire with receiveFrame().

Poco::UInt8 frameSlaveOrUnitAddress() const;

Returns the slave or unit address of the most recent frame received by receiveFrame().

bool isConnected() const;

Always returns true.

bool poll(
const Poco::Timespan & timeout
);

Waits for data to arrive at the port.

Returns true immediately if data is already in the internal buffer, or if data arrives during the specified time interval, otherwise false.

Poco::UInt8 receiveFrame();

Receives the next frame from the wire. Returns the frame's function code.

template < class Message > void sendFrame(
const Message & message
);

Sends a Modbus RTU frame over the wire.

bool checkFrame(
std::size_t size
);