Struct ExceptionResponse 

pub struct ExceptionResponse {
    pub function_code: FunctionCode,
    pub exception_code: ExceptionCode,
}

Modbus exception response.

Sent by a server when a request cannot be processed. The function code byte on the wire has bit 7 set (0x80 flag).

Fields

function_code: FunctionCode

The original function code (without the 0x80 flag).

exception_code: ExceptionCode

The exception code indicating the error condition.

Implementations

impl ExceptionResponse

pub fn decode(fc_byte: u8, data: &[u8]) -> Result<Self, DecodeError>

Decode from the raw function code byte and remaining data.

The fc_byte parameter is the raw byte from the wire WITH the 0x80 exception flag still set. The flag is stripped internally using FunctionCode::from_exception_raw.

Errors

Returns DecodeError::Truncated if data is too short. Returns DecodeError::LengthMismatch if data has extra bytes. Returns DecodeError::UnknownFunctionCode if the function code is not recognized. Returns DecodeError::UnknownExceptionCode if the exception code is not recognized.

Trait Implementations

impl Clone for ExceptionResponse

fn clone(&self) -> ExceptionResponse

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ExceptionResponse

impl Debug for ExceptionResponse

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

Formats the value using the given formatter.

impl Encode for ExceptionResponse

fn encode_into(&self, buf: &mut [u8]) -> Result<usize, EncodeError>

Write the full PDU (function code + data) into buf.

fn encoded_len(&self) -> usize

Total encoded length in bytes (including the function code byte).