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Chapter 2 Function Reference — SCXI_MuxCtr_Setup
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National Instruments Corporation 2-347 NI-DAQ FRM for PC Compatibles
SCXI_MuxCtr_Setup
Format
status = SCXI_MuxCtr_Setup (deviceNumber, enable, scanDiv, ctrValue)
Purpose
Enables or disables a DAQ device counter to be used as a multiplexer counter during SCXI
channel scanning to synchronize the DAQ device scan list with the module scan list that
NI-DAQ has downloaded to Slot 0 of the SCXI chassis.
Parameters
Input
Parameter Discussion
enable indicates whether to enable a device counter to be a mux counter for subsequent SCXI
channel scanning operations.
0: Disable the mux counter; the device counter is freed.
1: Enable the device counter to be a mux counter.
scanDiv indicates whether the mux counter will divide the scan clock during the acquisition.
0: The mux counter does not divide the scan clock; it simply pulses after every n
mux-gain entry on the DAQ device, where n is the ctrValue. The mux counter
pulses are currently not used by the SCXI chassis or modules, so this mode is not
useful.
1: The mux counter divides the scan clock so that n conversions are performed for
every mux-gain entry on the DAQ device, where n is the ctrValue.
ctrValue is the value NI-DAQ will program into the mux counter. If enable = 1 and
scanDiv =1, ctrValue is the number of conversions NI-DAQ will perform on each mux-gain
entry on the DAQ device. If enable = 0, NI-DAQ ignores this parameter.
Name Type Description
deviceNumber i16 assigned by configuration utility
enable i16 whether to enable counter 1 to be a mux counter
scanDiv i16 whether the mux counter will divide the scan
clock
ctrValue u16 value to be programmed into the mux counter