"VISA read text strings do not match identical constants text search - could it be double-byte characters.

Our compatible RS232 instrument sends ASCII strings to COM 1 and I read in the channels. For example, I get the "OVD" chain, or at least it looks like "OVD" if I post it. However, if I send to the entrance of a business structure selector and create a "TPM" case, if both seem to match varies. Sometimes it matches, and measure its length returns 3. Sometimes it is 7 or 11 or 12 characters long, and it does not match. I can reproduce a match or a mismatch with my choice of the order who went to the instrument before the command that causes the TPM reaction, but have has no sense of this idea. I ran him explicitly selected Whitespace Trim, with Both Ends (by default). I also shot the string into a byte array, autoindexed has to perform a loop on that and spent only the bytes if they do not equate 32, or if they equal 0, spaces of reflection or NULL values can be in there, but not better.

Using the Trim Whitespace comments that it does not remove the "double-byte characters". But I can't find anything else on the "double-byte characters". Could be the problem? There are functions that can tell if there are "double-byte characters", or convert into or out of them? By "double-byte characters," they simply mean Unicode?

Cebailey,

Double-byte characters are usually used for characters in languages other than English.  If you post your message in "display Codes"------"' in a string indicator you see other characters?   Could also use Hex display to see the number of bytes in the message.  You've probably found messages with non-printable characters that might be necessary to prune before using your application.  If you want more information the ' \' display of Codes, there is a detailed description in the help of LabVIEW.  You can also find information on our Web site using LabVIEW.  Backslash ("\") display Codes

Tags: NI Software

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