Checksum (4 characters)

[Neolker]

Hello everyone,

I have a serial device with a message-based communication, where it's used 4-characters checksum at the end of message (command).

For example command: "START " (space is included at the end),

in ASCII: "83 84 65 82 84 32",

so the sum is: "430",

this decimal in hexadecimal (4-characters) is: "01AE",

and the desired message is: "START 01AE".

So I tryed this with String To Byte Array and Add Array Elements, but result is only "AE" and I didn't find any solution for fix it.

Thanks in advance for your help.

[toto69]

Hi,

Convert your decimal number to an array of bytes, then use the "Byte array to string" function.

Regards

[Ettepet]

You should cast the byte numbers to a 16bit number before adding them.

[Henrik_Volkers]

convert to U16 , sum, split number, add to array    and finally convert to string and send to VISA 🙂

[Neolker]

Meanwhile, I came to this solution.

As with your solution, I still get: "START 
®" But we are close.

The correct output should be this string: "START 01AE". Any idea how to prevent conversion checksum from HEX to ASCII at Concatenate Strings?

[Henrik_Volkers · Accepted solution]

Using the format into string 🙂

[Neolker]

Great, you are really fast. Thanks a lot!  Last think is Use minimum field width (for checksum part) with 4 characters pad with zeros on left.

[Henrik_Volkers]

You have been to fast 😉 I had edited my solution

[Neolker]

Thank you again, this completely solve my problem. Have a nice day.

Greeatings from Czech Republic,

Martin Wolker