If you have Office 365:

=TEXTJOIN(" ",,CODE(MID(A1,SEQUENCE(LEN(A1)),1)))

or
= ARRAYTOTEXT(CODE(MID(A1,SEQUENCE(LEN(A1)),1)),0)

Answer from Ron Rosenfeld on Stack Overflow
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MrExcel
mrexcel.com › forums › question forums › excel questions
Convert a character to its ASCII value | MrExcel Message Board
December 14, 2011 - I thought (remembered?) it was easy to convert a char to ASCII using ASC() as follows: Col B is formatted to type=Number A1 holds "N" B1 holds =ASC(A1) expected but got "N" another attempt: B1 holds =ASCII(A1) #NAME I searched MRExcel and google ...
Discussions

Convert a string of hex to ASCII
See if this works for you =TEXTJOIN("",,CHAR(HEX2DEC(MID(D2,(2*ROW(INDIRECT("1:"&LEN(D2)/2)))-1,2)))) This is an array formula so enter with CTRL + SHIFT + ENTER if you don't have a version with dynamic arrays. This replaces n in your formula with an array of 1, 3 ,5, 7 ... to X-1 where X is the length if your text. Working from the inside out LEN(D2)/2 takes the lenght of D2 and divides by 2 to get your number of pairs "1:"&LEN(D2)/2 givea you a text string that looks like 1:Y where Y is the definition above INDIRECT("1:"&LEN(D2)/2).creates a cell reference matching the definition above ROW(INDIRECT("1:"&LEN(D2)/2)) gets the row numbers associated with the cell reference above, so 1, 2, 3, ..., Y where Y is as defined above (2*ROW(INDIRECT("1:"&LEN(D2)/2))) multiplies the numbers from the above step by 2, so you have 2, 4, 6, 8, ...., 2Y (2*ROW(INDIRECT("1:"&LEN(D2)/2)))-1 subtracts 1 from the above answers to get your starting positions, 1, 3, 5, 7, X-1, where X is length of your text and also 2Y More on reddit.com
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July 12, 2020
Decimal To Ascii In Excel
If there are any Excel guys there ... Ascii in Excel I sure would appreciate it. ... I think you can use =CHAR(x) where x is the number or cell you want to convert to an ASCII character ... Hmmm I'm not sure then, because I just tried =CHAR(B1) in cell A1 and it returned exactly what I was expecting when I typed a number in B1 ... Let me be a little more clear. I'm getting a number in decimal from CLX that represents an Ascii text... More on plctalk.net
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July 3, 2013
Importing a huge ASCII file that doesn't have delimiters?
u/urabignerd - Your post was submitted successfully. Once your problem is solved, reply to the answer(s) saying Solution Verified to close the thread. Follow the submission rules -- particularly 1 and 2. To fix the body, click edit. To fix your title, delete and re-post. Include your Excel version and all other relevant information Failing to follow these steps may result in your post being removed without warning. I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com
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*.spc to text/xlsx?
I don't know what *.spc is but is there a way to read it into Matlab? If there is then you can download octave which is the free and takes the Matlab language. Writing to an xlsx is then a line or two of code. More on reddit.com
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Use the CHAR function, which is the inverse of CODE. For example, =CHAR(65) returns "A". CHAR works with ASCII values 1-255. For Unicode values, use UNICHAR function in Excel 2013+.
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April 6, 2023 - For every ASCII number listed in a single cell (as in the picture above), you can use the following formula: =TEXTJOIN(" ",,CODE(MID(string, SEQUENCE(LEN(string)), 1)))
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r/excel on Reddit: Convert a string of hex to ASCII
July 12, 2020 -

Hey,

I have a desire to convert strings from 20 to 250 characters in length from hex pairs to ASCII. So for example "Hello, world!" is (without the quotes) is represented by 48656C6C6F2C20776F726C6421.

I have built a sheet in my workbook to do this, but it is brutally huge, because I basically made 125 columns to separate each pair, then 125 more columns to convert the hex value to dec, then 125 MORE columns to convert the dec value to ASCII, and one final column to TEXTJOIN the whole mess.

I realize now I could probably reduce a lot of those middle steps by combining my equations, i.e. char(hex2dec(mid(D2,n,2))) (where n is 1, 3, 5, ...) but that still leaves me with 125 columns to textjoin. Bonus - as I said this can range from 20 to 250 characters in length, so I need to take that into consideration. The quick & (very) dirty method I'm using above simply converts 125 pairs even if there aren't 125 to do - my equations just put blank cells in place of invalid ranges (i.e. if the message is only 200 characters long, there are 25 blank columns at the end) - this doesn't pad my message out with spaces in the textjoin, but if building some kind of code to automate this with a much smaller set of equations, I figure that will need to be taken into consideration.

I'm not good with functions, macros, or VB. I prefer to work in equations because I at least understand them. If you intend to suggest something like that, I may need some additional hand-holding.

Any thoughts? I'm sure there's something much simpler I'm overlooking.

Thanks!

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July 3, 2013 - If there are any Excel guys there ... Ascii in Excel I sure would appreciate it. ... I think you can use =CHAR(x) where x is the number or cell you want to convert to an ASCII character ... Hmmm I'm not sure then, because I just tried =CHAR(B1) in cell A1 and it returned exactly what I was expecting when I typed a number in B1 ... Let me be a little more clear. I'm getting a number in decimal from CLX that represents an Ascii text...
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