Send

Create and send message

• 

Libraries:
Simulink / Messages & Events
SimEvents

Alternative Configurations of Send Block:
Message Send

Description

The Send block reads the value of an input signal and creates a message that sends the value to the block connected to its output port. In effect, the Send block converts the input signal to a message. In message-based communication, a message is a discrete item that carries data of any type that Simulink^® supports.  For more information about messages, see Simulink Messages Overview.

The Send block has an input port to receive a signal and an optional input port to receive an enable signal. If you do not enable the optional port, the Send block inherits the sample time of the input signal. If you enable the optional port, the Send block executes when this port receives an enable signal with a value greater than 0.

The Send and Message Send blocks are identical blocks.

Examples

Animate and Understand Sending and Receiving Messages

Send, receive, visualize, and animate messages and display message data.

• Open Model

Use a Queue Block to Manage Messages

Use FIFO queue, LIFO queue, and priority queue to sort and store messages and define queue policies.

• Open Model

Establish Message Send and Receive Interfaces Between Software Components

Create message send and receive interfaces, and prepare components for C++ code generation.

• Open Model

Connect Message Receive Interface with Simulink Functions

Synchronize execution with data availability in message-based systems. We show how to model this behavior using events and actions. This example builds on another example, Establish Message Send and Receive Interfaces Between Software Components, where two software components communicate using messages.

• Open Model

Ports

Input

Port_1 — Input signal

scalar | vector | matrix

Input port that accepts a signal of any type that Simulink supports, including enumerated types. For more information, see Data Types Supported by Simulink. The block converts this input signal to a message.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | enumerated | bus | fixed point

Port_Enable — External enable signal

scalar

Optional input port to receive an enable signal. The Send block converts the input signal to a message when the enable signal has a value greater than 0.

Dependencies

To enable this port, select the box labeled Show enable port.

Data Types: double

Output

Port_1 — Output message

scalar | vector | matrix

The block outputs a message with constant priority 20.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | enumerated | bus | fixed point

Parameters

Show enable port — Display the enable port

off (default) | on

Select this check box to display enable port. For any input value that is greater than 0 send is enabled. For any value less than or equal to 0, the send is disabled.

Programmatic Use

Block Parameter: ShowEnablePort

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Block Characteristics

Data Types	Boolean | bus | double | enumerated | fixed point | integer | single | string
Direct Feedthrough	no
Multidimensional Signals	yes
Variable-Size Signals	no
Zero-Crossing Detection	no

Alternative Configurations

Message Send — Create and send message

The Message Send block differs from the Send block in name only.

Libraries:
Simulink / Messages & Events
SimEvents

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Note

Send blocks do not support row-major code generation.

Version History

Introduced in R2016a