You forgot the ":P" imho...
JRW
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--- In Crestron@..., "Witmarquzot" <tdurrant420@...> wrote:
Silly Chip, They just want to make really really sure that the string is right.
They could have made it worse though.
Check3 = (Check2 Xor Check1)/Check4
Check4 = Inverted XOR of Whole string (including Check 1 - 3)
I am guessing security interface by the weird check-sums
--- In Crestron@..., "Chip" <cfm@> wrote:
That would be an intriguing challenge... :)
I only need five short commands - I calculated the checksums by hand...
- Chip
--- In Crestron@..., Geoffrey Reynolds <greynlds@> wrote:
LOL - no SIMPL+ allowed for this :).
On Thu, Apr 19, 2012 at 1:30 PM, Chip <cfm@> wrote:
**
Okay, so requiring a checksum on a 232 string is redonkulous (these days)
to begin with - but check THIS one out:
<paraphrased>
"Two-byte checksum. Calculate an XOR of every ODD byte in the message (b1
XOR b3 XOR b5, etc) and invert the result - this is your first checksum
byte. Now calculate an XOR of every EVEN byte in the message (b2 XOR b4 XOR
b6, etc) and invert the result to obtain the second checksum byte"
Really? Really?!?!
- Chip
