Reading the Excitation Value of Each Channel on the SCXI-1520. Hardware: SCXI>>Modules>>SCXI-1520
Problem: How do I read the exact excitation voltage for each channel of my SCXI-1520 in NI-DAQmx? Solution: In order to read the excitation values of the SCXI-1520 in DAQmx, you must set up an analog input task to read the channels _pPosX and _pNegX, where X corresponds to the channel of the 1520 which you want to read. For instance, if your SCXI-1520 is the first module in your first chassis, (SC1Mod1) and you want to read the positive and negative excitation voltages for channel 0 of this module, you would add the channels SC1Mod1/_pPos0 and SC1Mod1/_pNeg0 to your scan list. You may need to include internal signals in your DAQmx Physical Channel Constant / Control by right-clicking on it, selecting "I/O Name FIltering...," then checking "Internal Channels." Note that because the excitation value must be the same for related physical channels, you must also set the excitation value of the excitation channels with a property node. Attached is an example which does just this. Note that reading these excitation values is only possible when the module is configured for multiplexed mode operation. This cannot be done in parallel mode. Related Links: Attachments:
Report Date: 11/01/2005 Last Updated: 11/13/2005 Document ID: 3R0G7CZA |
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