Documentation

There are two approaches for mapping this block to a specific I/O module installed in your target machine. All modules of the same type must be configured using the same method.

The Module ID has two functions:

The IO104 features a trigger signal, which indicates the start of each frame. It can either be generated by the card itself or it can be connected to another source.

Initiator: Let the internal rate generator produce the frame bursts trigger impulses based on the Frame Time setting. The TRIGGER I/O pin is configured as output and can be used to trigger other modules.

Target: Use the TRIGGER I/O pin as input for triggering frame bursts. The internal rate generator is disabled. This setting only defines the source of the trigger signal. Both analog inputs and outputs can be configured separately to use the trigger or not.

This is the interval time for the Trigger signal. For continuous frame-based sampling it must be defined as the product of frame size and sampling time. You can set a value of '-1' to have the module calculate the correct value for continuous sampling itself. The frame time is shared between the analog input and output channels. The time value is divided from the module's 40.32MHz clock. This frequency value might seem quite odd, but it is intended to produce accurate audio frequencies, such as 24 or 48kHz.

The autocalibration is enabled by default to obtain maximum measurement accuracy. The autocalibration function compensates for component aging and minimizes the effects of temperature on accuracy. The calibration normally takes approximately 2 seconds. All input channels are calibrated to a single internal voltage reference. Offset and gain error corrections for each channel are determined during the autocalibration process and are applied to each channel in real-time during data acquisition.

Warning: During the calibration process various signals may be present at the output pins, but they will stay inside the configured voltage range.

Select the active input/output channels in a vector. A defined number of channels can be selected using square brackets, for example [1 2 3]. A sequence of channels can be selected using a colon, for example, 1:4.

Select the voltage range for the input channels 1, 2, 5, and 6: ±10V, ±5V or ±2.5V

Select the voltage range for the input channels 3, 4, 7, and 8: ±10V, ±5V or ±2.5V

Either differential or single-ended operation is supported. This board has dedicated differential inputs. In single-ended mode, the inverting input ('-') is internally connected to the input return signal.

If checked, the analog input frames are aligned with the Trigger signal (see Main tab). In this case, with every Trigger impulse the module starts the input of the defined number of samples (Frame Size) at the speed defined by the input sampling clock (see next two parameters).

Number of samples in one frame. The product of frame size and sample time must be smaller or equal the frame trigger time.

Initiator: Let the internal rate generator produce the input sampling clock impulses based on the Input Sample Time setting (below). The INPUT CLK I/O pin is configured as output and can be used to drive the clock of other modules. Target: Use the INPUT CLK I/O pin as input for clocking the input sampling. The internal rate generator is disabled.

This is the interval time for the input clock sampling signal. The time value is divided from the module's internal 40.32MHz clock source and the minimum is 0.49603μs (20/40.32MHz). The clock source is the same for inputs, outputs and the frame burst trigger, so if the Frame Time equals the product of Frame Size and Sample Time, a perfect alignment of the frames is guaranteed.

If checked, all outputs for the Analog output block update simultaneously in response to an output clock. An output clock updates all output channels simultaneously with the most recent data received in the next cycle time.

If unchecked, each output is updated immediately when new data is received.

Select the active input/output channels in a vector. A defined number of channels can be selected using square brackets, for example [1 2 3]. A sequence of channels can be selected using a colon, for example, 1:4.

Define the initial signal level present on the outputs after the application has been downloaded. The values can be set individually by entering a vector: the value at a certain position in the Initial Values vector is applied to the channel as defined in the Active Channels vector. A scalar value applies to all the channels; for example, for individual values, type "[1 1.5 0 2.5]", and to set all channels to zero, type "0".

Define whether the initial values are also applied once the application has stopped. The behavior can be set individually for each channel using a vector. A scalar value applies to all the channels; for example, for individual values, type "[1 0 0 1]", and to set all channels to zero, type "0". "1" means use the Initial Value and "0" means keep the latest value.

Select the voltage range for all output channels: ±10V, ±5V or ±2.5V

If checked, the analog output frames are aligned with the Trigger signal (see Main tab). In this case, with every Trigger impulse the module starts the output of the defined number of samples (Frame Size) at the speed defined by the output sampling clock (see next two parameters).

Number of samples in one frame. The product of frame size and sample time must be smaller or equal the frame trigger time.

Initiator: Let the internal rate generator produce the output sampling clock impulses based on the Output Sample Time setting (below). The OUTPUT CLK I/O pin is configured as output and can be used to clock other modules. Target: Use the OUTPUT CLK I/O pin as input for clocking the output sampling. The internal rate generator is disabled.

This is the interval time for the output sampling clock. The time value is divided from the module's 40.32MHz clock and the minimum is 0.99206μs (40/40.32MHz). The clock source is the same for inputs, outputs and the frame burst trigger, so if the Frame Time equals the product of Frame Size and Sample Time, a perfect alignment of the frames is guaranteed.

Select the direction for the first channel group (1–8). It can be either set as input or output.

Select the direction for the second channel group (9–16). It can be either set as input or output.

Select the active output channels in a vector. A defined number of channels can be selected using square brackets, for example, [1 2 3]. A sequence of channels can be selected using a colon, for example, 1:4.

Define the initial signal level present on the outputs after the application has been downloaded. The values can be set individually by entering a vector: the value at a certain position in the Initial Values vector is applied to the channel as defined in the enabled channels. A scalar value applies to all the channels; for example, for individual values, type "[1 0 0 1]", and to set all channels to zero, type "0".

Define whether the initial values are also applied once the application has stopped. The behavior can be set individually for each channel using a vector. A scalar value applies to all the channels; for example, for individual values, type "[1 0 0 1]", and to set all channels to zero, type "0". "1" means use the Initial Value and "0" means keep the latest value.

Select the active input channels in a vector. Check the active output channels to avoid conflicts.