Continuously Generating Repeat Data from Digital Output Channels (Loop From Onboard Memory)

Use this example VI with the 6534 devices to continuously generate repeat data from one or more digital output channels. The 6534 devices contain two memory modules onboard, one for each group. The output data are loaded into the onboard memory once, and from the memory into an indefinite loop. This eliminates the bus bandwidth limitation.

1. Set the following controls on the front panel:

Enter the device number for the Device control.
Enter the channels/ports in Port List control, separated by commas or a colon. Valid port lists for the 6534 devices are: 0, 2, 0:1, 2:3, and 0:3.
Enter the buffer size in the Number of Updates control.
Choose internal or external for the Clock Source control.
Enter the frequency in Hz for the Clock Frequency control.

2. Double-check the parameters in the block diagrams for the intermediate VIs:

In the DIO Config VI, make sure the Group direction is set to output (default).
In the DIO Param VI, make sure the Parameter name is set to Pattern Generation Loop Enable and the Value in is set to ON (default).

3. Connect your signals:

Connect a wire from the external output device to the channels on the 6534 I/O connector to match the channels you entered in the front panel. If the clock source is external, connect a wire from your external clock to either REQ1 or REQ2, depending on the channel you have chosen. To find the actual pin numbers, refer to the 653X User Manual.

DAQ VIs Used: DIO Config, DIO Param, DIO Start, DIO Write, and DIO Clear

Requirements

Filename: buff_pattern_loop_out.zip

Software Requirements

Application Software: LabVIEW Full Development System 5.0.1
Language(s): LabVIEW

Hardware Requirements

Hardware Group: Multifunction DAQ (MIO)
Driver: Traditional NI-DAQ (Legacy) 6.9.0

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