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How do I Specify my PFI Line as an External Clock Using Traditional NI-DAQ (Legacy) in LabWindows/CVI?

Primary Software: LabWindows/CVI Development Systems>>Full Development System
Primary Software Version: 2.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: Multifunction DAQ (MIO)>>E Series

Problem:
I am using LabWindows/CVI to specify an external clock on a PFI line using Traditonal NI-DAQ. In LabVIEW I can use the AI Clock Config to specify a PFI line as an external clock but how do I achieve this in LabWindows/CVI?

Solution:
In order to specify an external clock using LabWindows/CVI you need to use the select_signal function .

status = Select_Signal (deviceNumber, signal, source, sourceSpec)

The following table summarizes the signals and sources for the I/O connector pins PFI0 through PFI9.

signal	source	sourceSpec
ND_PFI_0 through ND_PFI_9	ND_NONE	ND_DONT_CARE
ND_PFI_0	ND_IN_START_TRIGGER	ND_LOW_TO_HIGH
ND_PFI_1	ND_IN_STOP_TRIGGER	ND_LOW_TO_HIGH
ND_PFI_2	ND_IN_CONVERT	ND_HIGH_TO_LOW
ND_PFI_3	ND_GPCTR1_SOURCE	ND_LOW_TO_HIGH
ND_PFI_4	ND_GPCTR1_GATE	ND_POSITIVE
ND_PFI_5	ND_OUT_UPDATE	ND_HIGH_TO_LOW
ND_PFI_6	ND_OUT_START_TRIGGER	ND_LOW_TO_HIGH
ND_PFI_7	ND_IN_SCAN_START	ND_LOW_TO_HIGH
ND_PFI_7	ND_IN_SCAN_IN_PROG	ND_LOW_TO_HIGH
ND_PFI_8	ND_GPCTR0_SOURCE	ND_LOW_TO_HIGH
ND_PFI_9	ND_GPCTR0_GATE	ND_POSITIVE

You can use ND_NONE to disable output on the pin. The table above can also be found in the Traditional DAQ (Legacy) C Function Reference Help.

As an example to specify the PFI2 as an external clock in Traditional DAQ, you would call the following function :
Select_Signal(Board, ND_IN_SCAN_START, ND_PFI_2, ND_LOW_TO_HIGH);

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Report Date: 01/18/2007
Last Updated: 01/18/2007
Document ID: 45HID49U

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