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About Fast Data Channel (FDC) Operation
VX4101A MultiPaq Instrument User Manual
2–17
Selects the FDC logical channel number.
VXI[:SERVant]:FDC:SEL?
Returns the FDC current logical FDC channel number.
VXI[:SERVant]:FDC:OPEN <mode> [,<channel number>]
Opens the selected FDC channel in the selected mode (Read Only, Write
Only or Read/Write).
VXI[:SERVant]:FDC:CLOSe [<channel number>]
Closes the selected FDC channel.
VXI[:SERVant]:FDC:CONFiguration?
Returns configuration data on FDC channel.
VXI[:SERVant]:FDC:BUFFer <buffer size>
Defines the size of data for a source instrument to return.
NOTE. See the Syntax and Commands section for the DMM or the DAC for a full
explanation of the VXI:FDC command subsystem.
FDC Example
The following scenario and example code demonstrates how you can use the
FDC data transfer capabilities of the VX4101A.
In this scenario, the Unit Under Test (UUT) is a device that processes a variety of
waveforms. You must write a production test that sequences through various
patterns to verify that the device processes the waveforms properly. The
VX4101A DAC instrument will be the source of the waveform pattern to the
UUT.
Because of the large amount of data to construct the waveforms, you will use
FDC to transmit the raw data from the host machine to the DAC. You will use a
VXIbus embedded computer as the host machine and will run the Commander-
side FDC drivers supplied by the embedded computer’s VISA software.
NOTE. Please refer to the National Instrument’s NI-VISA Programmer’s
Reference Manual for a complete description of the command syntax used in
these examples.