Array of SINTs (Hex) to Strings

We have a IFM DTE102 RFID Reader. PLC is L82E v32

It presents the results into an array of SINTs, I have to select HEX as the style in the tag editor so it matches with the IFM web browser monitor.

All is good, it works, I can see the results.

I now need to convert my results, say E0 C4 00 63 62 in Hex into a string.

So when the Hex result on SINT[0] for example is 16#E0, I need the string to read E0, this is the bit I am struggling with.

If i can do one, I can do the rest and concat at my leisure, so the results keep the customer paying!

Any ideas?

TIA

What about if you change your style to ASCII.

The results make no sense - However the customer just wants a unique number so, thinking as I type the Hex thing may be a red herring!

ControlLogix has a DINT to String (DTOS) and a REAL to String (RTOS) instruction, but not "HEX to String".

To do this you would have to run a loop, separating out each 4-bit section of each SINT and converting it to ASCII.

The brute force method is just to look at the ASCII chart; (48 + X) gives you the digits 0 through 9, and (55 + X) gives you ASCII values 65 through 70, "A" through "F".

I wrote a little subroutine that you could imitate, or roll up into an AOI if you wished.

Ken meant 65 for A to F

Ken meant 65 for A to F

Click to expand...

It is true that ASCII 65 = "A" and ASCII 70 = "F".

But we're extracting a four-bit value between 10 and 16 from the series of hex stuff, so the value of the "nibble" itself is already at least 10.

I added that "nibble" to 55 to get the desired ASCII character.

I typed 65 the first time I tried it, and wondered why I got "K" through "P" in my string !

- Do bitwise AND with 0x0F mask on the first array byte

- Add to the result 0x30 or 0x37 instead if the result is equal or greater than 0x0A and you will get the Ascii code for the first character.

- Bit shift the original byte 4 positions to the right.

- Repeat from the beginning and you will get the second character Ascii code

- Repeat for the other elements of the array.

Thanks for taking the time for that Ken - it worked very well.