Enum Exception 

pub enum Exception {
    IllegalFunction,
    IllegalDataAddress,
    IllegalDataValue,
    ServerDeviceFailure,
    Acknowledge,
    ServerDeviceBusy,
    MemoryParityError,
    GatewayPathUnavailable,
    GatewayTargetFailedToRespond,
}

A Modbus exception code: the reason a device gives for refusing a request.

A device that cannot serve a request replies with the request’s function code with its high bit set, followed by one of these codes. Adu::exception and Response::exception surface it.

Examples

use pamoja_modbus::Exception;

assert_eq!(Exception::IllegalDataAddress.code(), 0x02);
assert_eq!(Exception::from_code(0x01), Some(Exception::IllegalFunction));

Variants

IllegalFunction

The function code is not allowed for this device. Exception code 0x01.

IllegalDataAddress

The data address is not allowed for this device. Exception code 0x02.

IllegalDataValue

A value in the request is not allowed for this device. Exception code 0x03.

ServerDeviceFailure

The device failed while serving the request. Exception code 0x04.

Acknowledge

The device accepted a long-running request and is still processing it. Exception code 0x05.

ServerDeviceBusy

The device is busy with a long-running request; retry later. Exception code 0x06.

MemoryParityError

The device detected a parity error in its memory. Exception code 0x08.

GatewayPathUnavailable

A gateway could not route the request to the target path. Exception code 0x0A.

GatewayTargetFailedToRespond

A gateway got no response from the target device, which usually means the device is not on the network. Exception code 0x0B.

Implementations

impl Exception

pub fn code(self) -> u8

Returns the wire byte for this exception.

Returns

The exception code as it appears after the function code in an exception response.

pub fn from_code(code: u8) -> Option<Exception>

Returns the exception a wire byte names, if it is a defined code.

Arguments

• code - the exception code byte following the function code.

Returns

The matching Exception, or None for a code this enum does not name.

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 Copy for Exception

impl Debug for Exception

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

Formats the value using the given formatter.

impl Display for Exception

Writes the exception’s name as the application protocol specification gives it, in lower case: illegal data address for 0x02.

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

Formats the value using the given formatter.

impl Eq for Exception

impl PartialEq for Exception

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Exception