RS422 write buffer, read data format

[Parthiban_SM]

Hi, I intend to read a distance value from a laser sensor using an RS-422 to USB converter. I have used the serial read LabVIEW example, but I am not getting the expected result. I am unsure about the write buffer string in VISA Write, and the data extracted from VISA Read is not in a readable format. Please suggest

[GerdW]

Hi Parthiban,

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@Parthiban_SM wrote:

I am unsure about the write buffer string in VISA Write,

and the data extracted from VISA Read is not in a readable format.

Please suggest

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• For the VISAWrite there is a clear description in the manual about the possible commands.
• There also is a description how multi-byte results (especially the 18bit distance value) is provided by the device: 3 bytes with their lower 6 bits holding the measurement data. I don't see any code where you attempt to handle those lower 6 bits of each of the 3 bytes…
• Yes, the data is provided in "unreadable" format: switch the string indicator to hex display!!!

[Basjong53]

You have the right idea, trying to remove the first 2 bits from each byte, but it's not quite correct. Here is how to do it, note that you can apply boolean operators directly on integers:

 

[GerdW]

Hi fuko,

is there a reason to answer with a crosspost from Reddit?