connectScalar

Add signal for streaming to scalar display

Since R2020b

Syntax

connectScalar(instrument_object,hDisplay,blockPath,portIndex,Name,Value)

connectScalar(instrument_object,hDisplay,signalName,Name,Value)

Description

connectScalar(instrument_object,hDisplay,blockPath,portIndex,Name,Value) connects a signal by using the block path and port index for streaming to a scalar display as a scalar object.

connectScalar(instrument_object,hDisplay,signalName,Name,Value) connects a signal by using a signal name for streaming to a scalar display as a scalar object.

Examples

Connect Signal by Using Block Path and Port Index

Connect a signal for streaming to the real-time instrument object and display the object by using the block path and port index.

mldatxfile = 'slrt_ex_tank.mldatx';
hInst  = slrealtime.Instrument(mldatxfile);
connectScalar(hInst,myDisplay,'slrt_ex_tank/ControlValue',1);

Connect Signal by Using Signal Name

Connect a signal for streaming to the real-time instrument object and display the object by using a signal name.

% added signal name to model before building mldatxfile
mldatxfile = 'slrt_ex_tank.mldatx';
hInst  = slrealtime.Instrument(mldatxfile);
connectScalar(hInst,myDisplay,'ControlValueOut');

Input Arguments

instrument_object — Object that represents real-time instrument

object

To create the instrument object, use the Instrument function.

Example: hInst

hDisplay — Handle to a scalar display

object

The scalar display object displays the streaming data from the instrument in an edit box, gauge, or other display. object.

Example: myGauge

blockPath — Block path for block with signal connected to one of its outports

character vector

For the selected block, gcb returns the full block path name.

Example: slrt_ex_tank/ControlValue

portIndex — Index of block port that is connected to signal for streaming

integer

For the selected signal, the output port index and signal name are visible in the signal hierarchy available in Simulink Real-Time explorer or in the Model Data Editor.

Example: 1

signalName — Name of signal for streaming

character vector

For the selected signal, the port index and signal name are visible in the signal hierarchy available in Simulink Real-Time explorer or in the Model Data Editor.

Example: ControlValueOut

Name,Value — Pair that set properties values

name-value pair

The Name,Value pair argument selects the signal properties that are added to the instrument object instrument_object and sets values for the properties.

Example: 'Decimation',2

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'Decimation',2

ArrayIndex — Array index of multi-element signal

integer

Selects an element of a multi-element signal.

Example: 'ArrayIndex',5

BusElement — Nonvirtual bus element

signal name (character vector)

Specifies a particular element of a nonvirtual bus to stream. The syntax for the BusElement value:

• Starts with the selected index for Array of Buses '(index).' or empty for scalar bus signals

• Contains the path from the first level down to the leaf element

• Separates each level of the hierarchy with a period '.'

• Has a leaf as last level

• Expresses the index for Array of Buses in the path as '(index)'

Example: 'BusElement','u1'

Example: 'BusElement','u4(1).b'

Example: 'BusElement','(1).a'

Callback — Function handle

function handle

Provides function handle for accepting (time,data) arguments and returning data.

Example: 'Callback', @(t,d)(d+app.Offset.Value)

Decimation — Decimation value

1 (default) | 1 .. 256

Specifies a decimation value for the signal. Permitted values for decimation are from 1 to 256.

Example: 'Decimation',2

Version History

Introduced in R2020b

R2022b: Select signals by name

In R2022b, you can use a signal name instead of a full block path to create robust binding between a signal and an instrument. This support applies to the SignalTable component and functions such as connectLine or connectScalar.