Documentation

Digital Output

Write to one or multiple digital output channels

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

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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

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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

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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.

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.

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.

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.

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.

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.

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.

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.

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.

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].

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.

Introduced before R2006a

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