topic Re: Line grouping in data acquisition in LabVIEW

Line grouping in data acquisition

Manik981211 — Thu, 25 Aug 2022 10:02:44 GMT

What is the difference between one channel for each line and one channel for all lines selection in line grouping for daqmx create channel digital output.

Re: Line grouping in data acquisition

santo_13 — Thu, 25 Aug 2022 15:57:21 GMT

Determines how you write data to DAQmx Write API

Re: Line grouping in data acquisition

Manik981211 — Thu, 25 Aug 2022 16:00:08 GMT

Can you please give detailed explanation with example

Re: Line grouping in data acquisition

GerdW — Thu, 25 Aug 2022 19:30:07 GMT

Hi Manik,

@Manik981211 wrote:
What is the difference between one channel for each line and one channel for all lines selection in line grouping for daqmx create channel digital output.

Drop a DAQmxWrite function in your block diagram and look at those 6 options you have when selecting Digital->Multiple Channel->Single Sample->"...". Now think about how "one channel for each line"/"one channel for all lines" relate to those options!

When handling multiple digital channels I prefer the "port" options...

Re: Line grouping in data acquisition

Manik981211 — Fri, 26 Aug 2022 05:46:27 GMT

Actually I can understandthe single channel>single sample. But I am unable to relate this with line grouping. Can you tell in what occasion I have to choose one channel for all lines and one channel for each line with some example and Discrription Thanks in advance

Re: Line grouping in data acquisition

GerdW — Fri, 26 Aug 2022 06:14:55 GMT

Hi Manik,

@Manik981211 wrote:
in what occasion I have to choose one channel for all lines and one channel for each line with some example and Discrription

"One channel for each line" relates to using boolean arrays, with one element per channel.

"One channel for all lines" relates to using U8/16/32 data, with each bit in the unsigned integers relating to one digital channel.

You don't "have to", but you "can" choose which datatype suits your requirements. Keep in mind: using boolean data in LabVIEW will increase memory requirements (8 times) as each bit is stored/handled in memory as a byte. Using unsigned integers is more memory efficient, but you need to learn how to set/reset single bits in those U-INTs…

Re: Line grouping in data acquisition

Manik981211 — Fri, 26 Aug 2022 09:57:49 GMT

I tried to find the difference between digital 1d and 2d boolean n channel 1 sample in labview help, I noticed each channel in the task can contain 1 digital line(1d) and the channel contain one or more digital lines(2d). But when I simulate this two, it seems to be work like same.can you explain why?. And also I didn't get any error.

Re: Line grouping in data acquisition

Manik981211 — Fri, 26 Aug 2022 12:05:15 GMT

I understand the concept. Thanks