Digital Output

Write to one or multiple digital output channels

• Library:

• Simulink Desktop Real-Time

• 

Description

Connect to and write to specific digital lines or channels from your Simulink^® model. After you have added a Digital Output block to your model, you can enter the parameters for its I/O driver.

Ports

Input

Digital Data — Digital data to write to output channels

vector

The data type and range of the input values depend upon the capabilities of the board.

Data Types: single | double | int8 | uint8 | int16 | uint16 | int32 | uint32

Output

Missed Ticks — Missed tick count (optional)

double

In normal or accelerator modes, returns the number of timer ticks that your model lags behind the real-time kernel. When the model lags by more than Maximum missed ticks, the software reports an error and simulation stops.

Dependency

When you select Show “Missed Ticks” port, this port is visible.

Data Types: double

Parameters

Install new board — Register a board

< no board selected > (default)

When you click Install new board, the software displays a list of manufacturers of supported boards. When you select a manufacturer, the software displays a list of boards available from that manufacturer. When you select a board, the software adds the board to the list of registered boards and makes that board the current board.

By default, the initial selection in the list of registered boards is < no board selected >.

Dependency

When you select a board in the list of registered boards, the Delete current board and Board setup buttons are available.

Delete current board — Delete the current board

(button)

To delete the current board, click this button. The initial selection of the list of registered boards changes to < no board selected >.

Dependency

To activate this parameter, select a board in the list of registered boards.

When you delete the current board, the Delete current board and Board setup buttons are no longer available.

Board setup — Set up the board

(button)

To set up the board, click this button.

A board-specific dialog box opens to set up the board. For more information, see the board manufacturer documentation.

Dependency

To activate this parameter, select a board in the list of registered boards.

To deactivate this parameter, click Delete current board.

Sample time — Sample time of block

0.1 (default) | double

Enter a value, in seconds, that represents how frequently you want the block to execute and interact with the I/O hardware. The block synchronizes your model with the real-time clock at this sample rate.

If you are using a fixed-step solver, enter the value that you entered as the Fixed step size configuration parameter or an integer multiple of that value.

Maximum missed ticks — Number of timer ticks by which your model can trail the kernel

10 (default) | integer

In normal or accelerator modes, enter the number of timer ticks that your model can lag behind the real-time kernel. When the model lags behind by this number or fewer timer ticks, the software assumes that the lag is temporary. It allows the model to catch up, even if the model misses some ticks. When the model lags by more than this number, the software reports an error and simulation stops.

In external mode, the software ignores this value.

Show “Missed Ticks” port — Send number of missed ticks to port Missed Ticks

'off' (default) | 'on'

In normal or accelerator modes, select this check box to send the number of missed ticks to output port Missed Ticks.

In external mode, the Missed Ticks port is zero.

Yield CPU when waiting — Yield CPU while kernel waits for hardware

'off' (default) | 'on'

In normal or accelerator modes, select this check box to grant other programs more CPU time while the kernel waits for a response from the hardware.

In external mode, the software ignores this value.

Output channels — Select digital output channels

vector

Enter a channel vector that selects the digital output channels you are using on this board. The vector can be any valid MATLAB^® vector form. For example, to select the first eight digital output channels, enter:

[1,2,3,4,5,6,7,8]

or

[1:8]

If you want to use the first four digital output lines, enter:

[1,2,3,4]

If you have one 8-bit digital channel, enter [1]. If you have two 8-bit digital channels, enter [1 9], and from the Channel mode list, select Byte.

Channel mode — Mode of representing the output lines

Bit (default) | Byte

From the list, select from one of the following:

• Bit — Expects a value of 0 or 1.

• Byte — Expects a value of 0–255 that is converted to one digital channel of eight digital lines.

Initial value — Initial value for output channels

vector

Enter the initial values for each digital output line or channel that you entered as the Output channels parameter. For example, if you entered [1,2,3,4], and you want initial values of 0 and 1, enter:

[0,0,1,1]

If you select Byte from the Channel mode list, enter a value from 0 through 255 for each digital output channel. For example, for 1 byte (eight digital lines) with an initial value of 25, enter [25]. For 2 bytes (16 digital lines) with initial values of 25 and 50, enter [25 50].

Final value — Final value for output channels

vector

Enter a final value for each digital output channel that you entered as the Output channels parameter. For example, if you entered [1,2,3,4], and you want final values of 0, enter:

[0,0,0,0]

If you select Byte from the Channel mode list, enter a value from 0 through 255 for each digital output channel.