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Chapter 10 Easy I/O for DAQ Library
© National Instruments Corporation 10-5 LabWindows/CVI Standard Libraries
• If you are using a Lab-PC+, DAQCard-500/700/1200, DAQPad-1200, PC-LPM-16:
These devices can only sample input channels in descending order, and you must end with
channel 0 ("3:0"). If you are using a Lab-PC+ or 1200 product in differential mode, you
must use even-numbered channels ("6,4,2,0").
• If you are using a DAQPad-MIO-16XE-50:
You can read the value of the cold junction compensation temperature sensor using the
following string as the channel:
"cjtemp"
• If you are using SCXI:
You can address SCXI channels when you attach one or more SCXI chassis to a plug-in data
acquisition board. If you operate a module in parallel mode, you can select a SCXI channel
either by specifying the corresponding onboard channels or by using the SCXI channel
syntax described below. If you operate the modules in multiplexed mode, you must use the
SCXI channel syntax.
The SCXI channel syntax is as follows:
•
"OB1!SCx!MDy!a" /* channel a on the module in slot y of the chassis with
ID x is multiplexed into onboard channel 1 */
•
"OB0!SCx!MDy!a:b" /* channels a through b inclusive on the module in slot
y of the chassis with ID x is multiplexed into onboard channel 0 */
SCXI channel ranges cannot cross module boundaries. SCXI channel ranges must always
increase in channel number.
The following examples of the SCXI channel syntax introduce the special SCXI channels:
•
"OB0!SCx!MDy!MTEMP" /* The temperature sensor configured in MTEMP mode
on the multiplexed module in slot y of the chassis with ID x. */
•
"OB1!SCx!MDy!DTEMP" /* The temperature sensor configured in DTEMP mode
on the parallel module in slot y of the chassis with ID x. */
•
"OB0!SCx!MDy!CALGND" /* (SCXI-1100 and SCXI-1122 only) The grounded
amplifier of the module in slot y of the chassis with ID x. */
•
"OB0!SCx!MDy!SHUNT0" /* (SCXI-1121, SCXI-1122 and SCXI-1321 only) Channel
0 of the module in slot y of the chassis with ID x, with the shunt resistor
applied. */
•
"OB0!SCx!MDy!SHUNT0:3" /* (SCXI-1121, SCXI-1122 and SCXI-1321 only) Channel
0 through 3 of the module in slot y of the chassis with ID x, with the
shunt resistors applied at each channel. */