Enum FunctionCode 

pub enum FunctionCode {
    ReadCoils,
    ReadDiscreteInputs,
    ReadHoldingRegisters,
    ReadInputRegisters,
    WriteSingleCoil,
    WriteSingleRegister,
    WriteMultipleCoils,
    WriteMultipleRegisters,
    Other(u8),
}

Modbus function code extracted from a request frame.

Covers the most common read/write operations. Unknown function codes are wrapped in Other and forwarded to the RTU device without modification, so vendor-specific extensions work transparently.

Examples

if let BridgeEvent::Transaction(t) = event {
    match t.function_code {
        FunctionCode::ReadHoldingRegisters => { /* … */ }
        FunctionCode::WriteMultipleRegisters => { /* … */ }
        other => defmt::warn!("unexpected FC: {}", other),
    }
}

Variants

ReadCoils

FC 0x01 — reads one or more output coils (digital outputs).

ReadDiscreteInputs

FC 0x02 — reads one or more discrete inputs (digital inputs).

ReadHoldingRegisters

FC 0x03 — reads one or more holding registers (read/write 16-bit words).

ReadInputRegisters

FC 0x04 — reads one or more input registers (read-only 16-bit words).

WriteSingleCoil

FC 0x05 — writes a single output coil.

WriteSingleRegister

FC 0x06 — writes a single holding register.

WriteMultipleCoils

FC 0x0F — writes multiple output coils in a single request.

WriteMultipleRegisters

FC 0x10 — writes multiple holding registers in a single request.

Other(u8)

Any function code not listed above — passed through to the RTU device transparently.

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 Copy for FunctionCode

impl Debug for FunctionCode

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

Formats the value using the given formatter.

impl Display for FunctionCode

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

Formats the value using the given formatter.

impl Eq for FunctionCode

impl From<u8> for FunctionCode

fn from(v: u8) -> Self

Converts to this type from the input type.

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 StructuralPartialEq for FunctionCode