Hi John, yes I receive 2 packets fine (with response) then things go strange
only on checksum. Your C# routine is different from DLPlus for the Calc, I’ll
try that in the morning and see if that changes.
Sent from my iPhone
> On Sep 19, 2019, at 9:58 PM, John R. Hogerhuis <jho...@pobox.com> wrote:
>
> Are you sure you got a full, aligned packet? It starts with ZZ , counted
> length, no missing characters?
>
> The DLPlus checksum is correct. More likely you're misaligned, or somehow
> dropped, swapped, or corrupted a character.
>
> Here is the C# code too for comparison
>
> public byte Checksum(byte[] ary, uint ofs, uint fence)
> {
> uint sum = 0;
>
> for (var i = ofs; i < fence; i++)
> sum += ary[i];
>
> return (byte)((~sum) & 0xff);
> }
>
> Welcome to the cabal of TPDD protocol initiates.
>
> -- John.
