Enum Exception 

pub enum Exception {
    IllegalFunction,
    IllegalDataAddress,
    IllegalDataValue,
    ServerDeviceFailure,
    Acknowledge,
    ServerDeviceBusy,
    MemoryParityError,
    GatewayPathUnavailable,
    GatewayTargetDeviceFailedToRespond,
    Custom(u8),
}

High-level protocol error.

The server received the request without a communication error, but could not handle it.

Variants

IllegalFunction

The function code received in the query is not an allowable action for the server:

• the function was not implemented in the unit selected;
• the server is in the wrong state to process a request of this type.

IllegalDataAddress

The data address received in the query is not an allowable address for the server.

The combination of reference number and transfer length is invalid.

IllegalDataValue

A value contained in the query data field is not an allowable value for server.

ServerDeviceFailure

An unrecoverable error occurred while the server was attempting to perform the requested action.

Acknowledge

The server has accepted the request and is processing it, but a long duration of time will be required to do so.

This response is returned to prevent a timeout error from occurring in the client. The client can next issue a «Poll Program Complete» message to determine if processing is completed.

ServerDeviceBusy

The server is engaged in processing a long–duration program command.

The client should retransmit the message later when the server is free.

MemoryParityError

The server attempted to read record file, but detected a parity error in the memory.

The client can retry the request, but service may be required on the server device.

GatewayPathUnavailable

The gateway was unable to allocate an internal communication path from the input port to the output port for processing the request.

GatewayTargetDeviceFailedToRespond

No response was obtained from the target device.

Usually means that the device is not present on the network.

Custom(u8)

Non-standard error code.

Trait Implementations

impl Clone for Exception

fn clone(&self) -> Exception

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Exception

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

Formats the value using the given formatter.

impl Decode for Exception

fn decode(from: &mut impl Buf) -> Result<Self, Error>

impl Display for Exception

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

Formats the value using the given formatter.

impl Error for Exception

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<Exception> for Error

fn from(source: Exception) -> Self

Converts to this type from the input type.

impl Copy for Exception