Enum RequestPacketError 

pub enum RequestPacketError {
    RequestTooBig,
    ResponseWillTooBig,
    CannotBroadcast,
}

Errors that can occur while building a Modbus RTU request packet.

Variants

RequestTooBig

This error is raised when the function tries to produce a request packet that exceeds the Modbus RTU protocol’s maximum packet length of 256 bytes.

Requests that attempt to write too many values at once will exceed the 256-byte limit of the request packet.

---

If you intentionally need to bypass the request packet length limit, enable the Cargo feature as shown below.

Warning: packets produced with this feature enabled may fail during communication.

[dependencies]
modbus-rtu = { version = "1.0", features = ["unlimited_packet_size"] }

ResponseWillTooBig

This error is raised when the expected response packet would exceed the Modbus RTU protocol’s maximum packet length of 256 bytes.

---

If you intentionally need to bypass the response packet length limit, enable the Cargo feature as shown below.

Warning: packets produced with this feature enabled may fail during communication.

[dependencies]
modbus-rtu = { version = "1.0", features = ["unlimited_packet_size"] }

CannotBroadcast

This error occurs when attempting to broadcast a function that does not support broadcasting (e.g., 0x01, 0x03).

---

If you intentionally need to broadcast such functions, enable the Cargo feature as shown below.

Warning: packets produced with this feature enabled may fail during communication.

[dependencies]
modbus-rtu = { version = "1.0", features = ["enforce_broadcast"] }

Trait Implementations

impl Clone for RequestPacketError

fn clone(&self) -> RequestPacketError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RequestPacketError

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

Formats the value using the given formatter.

impl Display for RequestPacketError

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

Formats the value using the given formatter.

impl Error for RequestPacketError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<RequestPacketError> for SendError

fn from(value: RequestPacketError) -> Self

Converts to this type from the input type.

impl PartialEq for RequestPacketError

fn eq(&self, other: &RequestPacketError) -> 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 RequestPacketError

impl Eq for RequestPacketError

impl StructuralPartialEq for RequestPacketError