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How to Convert Between Hexadecimal and ASCII in LabVIEW?



Primary Software: LabVIEW Development Systems>>LabVIEW Base Development System
Primary Software Version: 1.0
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
I am communicating with an instrument that sends back information in the form of hexadecimal values.  For instance, instead of sending the letter L, it sends back its corresponding hexadecimal representation 4C. How can I programmatically convert this hexadecimal representation into its corresponding ASCII representation in LabVIEW? What if I need to send information back to the instrument in hexadecimal?

Solution:
The hexadecimal string input for the following VIs are in the form FF not 0xFF. The 0x is the convention for indicating that a number is hexadecimal based rather then decimal based. A standard hexademical string does not carry this indicator, and it must be removed before the value can be translated. This behavior is identical to the Hexadecimal String to Number VI and is expected.  If you have strings which have the 0xFF format you can use a Search/Split String VI with a search character of x before the string is passed to the Scan Value VI.

Converting to ASCII from Hexadecimal

To convert a hexadecimal string into an ASCII string, you must first convert the hexadecimal string to its decimal representation using the Scan Value function, which is found in the functions palette under Programming»String»String/Number Conversion.  You can then convert the decimal representation to its ASCII string equivalent using the Type Cast function, found in the Functions Palette under Mathematics»Numeric»Data Manipulation.


Converting to Hexadecimal from ASCII

To convert a ASCII string into a hexadecimal string, you must first convert the ASCII string to its decimal representation using the Type Cast function, which is found in the functions palette under Mathematics»Numeric»Data Manipulation. You can then convert the decimal representation to its hexadecimal string equivalent using the Number to Hexadecimal String function, found in the Functions Palette under Programming»String»String/Number Conversion.

 

The links below provideNI Community example VIs that accomplish these conversions.


Related Links:
KnowledgeBase 3B8F04XR: How Do I Convert a Hex String to a Normal String?
NI Community: Converting Between Hexadecimal and ASCII in LabVIEW
NI Community: Converting ASCII to Same Value Hex to Floating Point
NI Community: Convert a Hex Array of Strings to an ASCII Array of Strings without changing values


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Report Date: 03/24/2009
Last Updated: 08/13/2014
Document ID: 4VNI8J1V

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