ISO Checksum

Background

Checksums are traditional Data Communication tools that let you determine if there has been a transmission error.

Most checksum algorithms generate unique values for the "packet" of data being sent, then send these values along with the data. At the receiving end, the system checks that the data generates the SAME unique values, meaning there was no transmission error.

This version is a simple ISO Checksum, demonstrated using a small "packet" of integers, and 2 checksums.

Code

Let's try it out:

Notes:

• Include data as a sequence separated with commas eg: "12,45,7,1".
• data items should be "byte-sized" (eg 0..255) ie MOD 256
• In this demonstration, the algorithm will generate an additional pair of checksum bytes when you calculate - that represents the "packet" of data sent.
• If you are confirming, then the last 2 data elements will be assumed to be the checksum bytes.

Data :

Enter data then press calculate or confirm.