Enum FunctionCode 

#[non_exhaustive]
pub enum FunctionCode {
    ReadCoils,
    ReadDiscreteInputs,
    ReadHoldingRegisters,
    ReadInputRegisters,
    WriteSingleCoil,
    WriteSingleRegister,
    WriteMultipleCoils,
    WriteMultipleRegisters,
    MaskWriteRegister,
    ReadWriteMultipleRegisters,
    ReadExceptionStatus,
    Diagnostics,
    ReadFifoQueue,
    Custom(u8),
}

Modbus function codes identifying the type of request or response.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ReadCoils

FC01 — Read Coils.

ReadDiscreteInputs

FC02 — Read Discrete Inputs.

ReadHoldingRegisters

FC03 — Read Holding Registers.

ReadInputRegisters

FC04 — Read Input Registers.

WriteSingleCoil

FC05 — Write Single Coil.

WriteSingleRegister

FC06 — Write Single Register.

WriteMultipleCoils

FC15 (0x0F) — Write Multiple Coils.

WriteMultipleRegisters

FC16 (0x10) — Write Multiple Registers.

MaskWriteRegister

FC22 (0x16) — Mask Write Register.

ReadWriteMultipleRegisters

FC23 (0x17) — Read/Write Multiple Registers.

ReadExceptionStatus

FC07 — Read Exception Status.

Diagnostics

FC08 — Diagnostics.

ReadFifoQueue

FC24 (0x18) — Read FIFO Queue.

Custom(u8)

A function code not recognised by this library.

Implementations

impl FunctionCode

pub const fn as_u8(self) -> u8

Return the wire byte value for this function code.

pub fn from_u8(value: u8) -> Result<Self, DecodeError>

Parse a function code from its wire byte value.

pub const fn is_exception(value: u8) -> bool

Returns true if the high bit (0x80) is set, indicating an exception response.

Trait Implementations

impl Clone for FunctionCode

fn clone(&self) -> FunctionCode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionCode

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

Formats the value using the given formatter.

impl PartialEq for FunctionCode

fn eq(&self, other: &FunctionCode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for FunctionCode

impl Eq for FunctionCode

impl StructuralPartialEq for FunctionCode