Struct Message

pub struct Message {
    pub transaction_id: u16,
    pub protocol_id: u16,
    pub length: u16,
    pub unit_id: u8,
    pub function: Function,
    pub access_type: Flags<AccessType>,
    pub category: Flags<CodeCategory>,
    pub data: Data,
    pub error_flags: Flags<ErrorFlags>,
}

Breakdown of the parsed modbus bytes

Fields

transaction_id: u16

protocol_id: u16

length: u16

unit_id: u8

function: Function

access_type: Flags<AccessType>

category: Flags<CodeCategory>

data: Data

error_flags: Flags<ErrorFlags>

Implementations

impl Message

pub fn matches(&mut self, other: &Message) -> bool

Matches this message with another. Used to validate requests with responses.

pub fn get_write_value_at_address(&self, address: u16) -> Option<u16>

Gets the register/coil/input value at the given address, if it has been modified in the transaction. Returns the value as Some(u16) if it is found, otherwise returns None. The address passed in must be offset by 1 to reflect the actual coil/register and not the address found in the PDU. See the protocol reference for more information on addresses.

pub fn get_address_range(&self) -> Option<RangeInclusive<u16>>

Gets the address and quantity in the read/write data. If the data does not match and they can’t be found, None is returned. The range returned is offset by 1 to account to reflect the coils/registers that start at 1 instead of in the PDU numbers where they start at 0. More details can be found in the protocol reference

Trait Implementations

impl Debug for Message

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

Formats the value using the given formatter.

impl From<&Message> for Flags<CodeCategory>

fn from(msg: &Message) -> Self

Converts to this type from the input type.

impl PartialEq for Message

fn eq(&self, other: &Message) -> 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 Eq for Message

impl StructuralPartialEq for Message