Note

Ophyd.v2 is included on a provisional basis until the v2.0 release and may change API on minor release numbers before then

ophyd.v2.core.SignalBackend

class ophyd.v2.core.SignalBackend(*args, **kwds)

Bases: Generic[T]

A read/write/monitor backend for a Signals

Methods

connect	Connect to underlying hardware
get_descriptor	Metadata like source, dtype, shape, precision, units
get_reading	The current value, timestamp and severity
get_value	The current value
put	Put a value to the PV, if wait then wait for completion for up to timeout
set_callback	Observe changes to the current value, timestamp and severity

Attributes

datatype	Datatype of the signal value
source	Like ca://PV_PREFIX:SIGNAL

datatype: Type[T] | None = None

Datatype of the signal value

source: str = ''

Like ca://PV_PREFIX:SIGNAL

abstract async connect()

Connect to underlying hardware

abstract async put(value: T | None, wait=True, timeout=None)

Put a value to the PV, if wait then wait for completion for up to timeout

abstract async get_descriptor() → Descriptor

Metadata like source, dtype, shape, precision, units

abstract async get_reading() → Reading

The current value, timestamp and severity

abstract async get_value() → T

The current value

abstract set_callback(callback: Callable[[Reading, T], None] | None) → None

Observe changes to the current value, timestamp and severity