[plug] OT: Data check digits

[Shayne O'Neill]

Do you have a copy of BHTQTYS.DAT?

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"Must not Sleep! Must warn others!"
-Aesop.
Shayne O'Neill. Indymedia. Fun.
http://www.perthimc.asn.au

On Mon, 31 May 2004, Adam Davin wrote:

> Good Evening all,
>
> This is slightly off topic.
>
> I am embarking on a learning journey to write a program that will take the place of a PDT (portable data terminal) the software on the PDT is proprietary and source is not available to me. What I have been able to do is borrow one of the PDT's and take a look at the serial communication between the PDT and the destination program using snooper. Below is a sample output. I can deal with most of it. The bit I am having problems with at present is the last 2(?) bytes on each line. I realise that these are check digits of some sort, I'm just not sure where to start in going about figuring out how they are calculated.
> Below is a sample. If more samples are required, I can get some more.
> 0>1: \x05
> 1>0: \x06
> 0>1: \x01BHTQTYS.DAT 00003051304080808\x035
> 1>0: \x06
> 0>1: \x020000193117420003800005                        \x03\x07
> 1>0: \x06
> 0>1: \x0200002742709112010 0003                        \x03\x1e
> 1>0: \x06
> 0>1: \x0200003637407193402 0015                        \x03\x18
> 1>0: \x06
> 0>1: \x04
> 1>0: \x06
>
> Any help would be greatly appreciated.
>
> Thanks in advance.
>
> Regards,
>
> Adam Davin.
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