Digital Output block for PCI-6221/37 and PXI-6221/37 boards
Simulink® Real-Time™ Library for National Instruments®
Models can have multiple digital output blocks for one physical board. In this case, the Simulink Real-Time environment executes the blocks based on their sorted order as determined by the Simulink software.
Each board has one set of digital I/O ports. You can independently configure each port to be input or output.
A digital input block can share channels with a digital output block. In this configuration, the input block reads the last value written to the digital output block on the shared channels.
The block compares the value written to each port with 0.5.
|Value written||Block writes digital output with a value of...|
I/O Module Output
Block Input Data Type
< 0.5 = TTL low
Enter numbers 1 or 2 to select the digital output lines used with this port. This driver allows the selection of individual digital output lines in arbitrary order. The number of elements defines the number of digital lines used.
For example, to use the first output, enter
Number the lines beginning with 1 even if this board manufacturer starts numbering the lines with 0.
The reset vector controls the behavior of the channel at model
termination. Enter a scalar or a vector that is the same length as
the channel vector. If you specify a scalar value, that setting is
replicated over the channel vector. If you specify a value of
the corresponding channel is reset to the value specified in the initial
value vector. If you specify a value of
channel remains at the last value attained while the model was running.
The initial value vector contains the initial values (
of the output channels. Enter a scalar or a vector that is the same
length as the channel vector. If you enter a scalar, that value is
replicated as the initial value over the channel vector. The channels
are set to these initial values between the time the model is downloaded
and the time it is started.
Enter the base sample time or a multiple of the base sample
-1 means sample time is inherited).
If only one board of this type is in the target computer, enter
locate the board.
If two or more boards of this type are in the target computer,
enter the bus number and the PCI slot number of the board associated
with this driver block. Use the format
To determine the bus number and the PCI slot number, type:
tg = slrt; getPCIInfo(tg, 'installed')