caproto.server.PvpropertyByte

class caproto.server.PvpropertyByte(*, pvname: str, group: caproto.server.server.PVGroup, pvspec: caproto.server.server.PVSpec, doc: Optional[str] = None, record: Optional[Union[str, Type[T_RecordFields]]] = None, logger: Optional[logging.Logger] = None, **kwargs)

Read-write 8-bit CHAR data for pvproperty for bytes.

Methods

auth_read(hostname, username, data_type, *)	Get DBR data and native data, converted to a specific type
auth_write(hostname, username, data, …[, …])	Data write hook for clients.
calculate_length(value)	Calculate the number of elements given a value
check_access(hostname, username)	This always returns AccessRights.READ|AccessRights.WRITE.
get_field(field)	Get a field by name.
is_compatible_array(value)	Check if the provided value is a compatible array.
post_state_change(state, new_value)	This is called by the server when it exits its StateUpdateContext.
pre_state_change(state, new_value)	This is called by the server when it enters its StateUpdateContext.
preprocess_value(value)	Pre-process values destined for verify_value and write
publish(flags)	Publish data to appropriate queues matching the SubscriptionSpec.
read(data_type)	The top-level read method, with a specific requested data type.
subscribe(queue, sub_spec, sub)	Subscribe a queue for the given subscription specification.
unsubscribe(queue, sub_spec)	Unsubscribe a queue for the given subscription specification.
update_fields(value)	This is a hook to update field instance data.
verify_value(value)	The top-level dbr-facing “write” method.
write(value, *[, flags, verify_value, …])	Write data from native Python types.
write_from_dbr(data, data_type, metadata, *)	Write data from a provided DBR data type.
write_metadata([publish, units, precision, …])	Write metadata, optionally publishing information to clients.

Attributes

alarm	The ChannelAlarm associated with this data
data_type
default_value
epics_timestamp	EPICS timestamp as (seconds, nanoseconds) since EPICS epoch.
length	The number of elements (length) of the current value
lower_alarm_limit	Read-only access to lower_alarm_limit data
lower_ctrl_limit	Read-only access to lower_ctrl_limit data
lower_disp_limit	Read-only access to lower_disp_limit data
lower_warning_limit	Read-only access to lower_warning_limit data
max_length	The maximum number of elements (length) this channel can hold
severity	Alarm severity
status	Alarm status
timestamp	UNIX timestamp in seconds.
units	Read-only access to units data
upper_alarm_limit	Read-only access to upper_alarm_limit data
upper_ctrl_limit	Read-only access to upper_ctrl_limit data
upper_disp_limit	Read-only access to upper_disp_limit data
upper_warning_limit	Read-only access to upper_warning_limit data
value	Read-only access to value data