RE: Heartbeat CRC checksum?

[i.bird@xxxx]

Thanks Kevin

I will move the two offnding lines of code.

Relay controller progress
The mark two version as on my website under projects then relay controller
has gone into the post for the next VB stage of development. Fingers
crossed for UKHA. I am now looking at yet another chip with more memory for
all the 'stuff' it now supports. 16 inputs, 8 open collector outputs for
starters.

All good fun

Ian

Original Message:
-----------------
From: Kevin Hawkins <a
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Date: Thu, 24 Apr 2003 12:04:40 +0100
To: <a
href="/group/xap_automation/post?postID=Ssrao_VyezZGN1ZMdhx25yiulUD6zlWvdO1INLBtr28mRWjlQwiKLyy-PxoAHrzTAhFCSkA4xDz0p2OACxlB2t-1U9IUjNg">xap_automation@xxxxxxx</a>
Subject: RE: [xap_automation] Heartbeat CRC checksum?


Ian,

It's a while ago on checksums but as I recall it should be there on
all serial messages including the heartbeats. Indeed on any hardware
transport when there is a possibility of corruption of data or where some
higher layer doesn't encapsulate error detection for you.

Kevin

> -----Original Message-----
> From: Ian Bird [mailto:<a
href="/group/xap_automation/post?postID=_RtU4PxPhNJolsYfd2MMIHBkADFTyv8zhNdH-KPNUw-uLF-ZYiJaAgqTjJLnmXetFTNsoXeXd_AaOK8x">Ian@M...</a>]
> Sent: 23 April 2003 16:36
> To: <a
href="/group/xap_automation/post?postID=Ssrao_VyezZGN1ZMdhx25yiulUD6zlWvdO1INLBtr28mRWjlQwiKLyy-PxoAHrzTAhFCSkA4xDz0p2OACxlB2t-1U9IUjNg">xap_automation@xxxxxxx</a>
> Subject: [xap_automation] Heartbeat CRC checksum?
>
> Hi all
>
> Apologies to those on both xAP lists........
>
> Does the heartbeat message have the ---- before the <ETX> when
> transmitted on the serial line? This would represent the CRC digits
> that have not been calculated (as they are optional). Whilst testing
> last night I saw I have it some times not others and I wondered if
> there was an agreed yes or no for it.
>
> Thanks
>
> Ian
>
>
>
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