Struct Pdu 

pub struct Pdu { /* private fields */ }

Modbus Protocol Data Unit (PDU).

The PDU is the core of the Modbus message, consisting of a function code and the associated data payload.

Implementations

impl Pdu

pub fn new( function_code: FunctionCode, data: Vec<u8, MAX_PDU_DATA_LEN>, data_len: u8, ) -> Self

Creates a new Pdu instance.

Arguments

• function_code - The Modbus function code.
• data - The data payload (either raw bytes or structured sub-codes).
• data_len - The actual length of the data payload in bytes.

Returns

A new Pdu instance.

pub fn function_code(&self) -> FunctionCode

Accessor for the function code.

pub fn data(&self) -> &Vec<u8, MAX_PDU_DATA_LEN>

Accessor for the data payload.

pub fn data_len(&self) -> u8

Accessor for the actual length of the data payload.

pub fn error_code(&self) -> Option<u8>

Accessor for the error code from the PDU.

pub fn to_bytes(&self) -> Result<Vec<u8, 253>, MbusError>

Converts the PDU into its byte representation.

This method serializes the function code and its associated data payload. It uses an unsafe block to access the Data union, assuming that self.data.bytes contains the full data payload and self.data_len accurately reflects its length.

Returns

Ok(Vec<u8, 253>) containing the PDU bytes, or an MbusError if the PDU cannot be serialized (e.g., due to buffer overflow).

pub fn from_bytes(bytes: &[u8]) -> Result<Self, MbusError>

Creates a PDU from its byte representation.

This method parses the function code and data payload from the given byte slice.

Arguments

• bytes - A byte slice containing the PDU (Function Code + Data).

Returns

Ok(Pdu) if the bytes represent a valid PDU, or an MbusError otherwise.

Trait Implementations

impl Clone for Pdu

fn clone(&self) -> Pdu

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Pdu

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.