Re: An alternative to proprietary cnc systems?


<DaveB> wrote in message news:43161eab.9824455@xxxxxxxxxxxxxxxxxxxxxx
> On Wed, 31 Aug 2005 17:16:37 -0400, Cliff <Clhuprich@xxxxxxx> wrote:
>
>>On Wed, 31 Aug 2005 16:56:56 -0400, "Chris" <abuse@xxxxxxx> wrote:
>>
>>>
>>><DaveB> wrote in message news:43161511.7365533@xxxxxxxxxxxxxxxxxxxxxx
>>>> On Wed, 31 Aug 2005 16:26:12 -0400, Cliff <Clhuprich@xxxxxxx> wrote:
>>>>
>>>>>On Wed, 31 Aug 2005 12:15:45 -0400, "Chris" <abuse@xxxxxxx> wrote:
>>>>>
>>>>>>"F. George McDuffee" <gmcduffee@xxxxxxxxxxxx> wrote in message
>>>>>>news:nhfbh118dquv94918rahfp777v277v6efo@xxxxxxxxxx
>>>>>>> If the GUI computer goes down does it take the other computer
>>>>>>> with it?
>>>>>>>
>>>>>>
>>>>>>Depends,
>>>>>>Most would have a safe signal to know if it the GUI did go down. I
>>>>>>would
>>>>>>hope that most outbound processors have this.
>>>>>
>>>>> Umm ... how does a crashed computer send a signal that it's crashed?
>>
>>>> Maybe cause the signal from the pc is no longer there...........just
>>>> a guess.
>>>>
>>>>
>>>>
>>>Sometimes called a heartbeat. In simplest terms TTL or +5vdc on a line
>>>tells the downstream computer that the upstream is still alive (actually
>>>more complex than that but you get the idea).
>>>
>>>So the down stream computer could be as ignorant as some of the trolls
>>>here.
>>>
>>>heartbeat on = computer running or troll still trolling
>>>
>>>heartbeat off = computer not running or peace to us all
>>>
>>
>> And it cannot crash in any way that locks the signal in the
>>ON position?
>>--
>>Cliff
>

That is why I kept it simple. I figured you would have enough time
understanding the heartbeat bit. See where it says it is more complex??

So :
The computer could take (for example) the term "trolls suck" in ASCII
convert it to binary and pulse the 5volts with that.

If the downstream computer stops seeing "trolls suck" he must assume that
indeed the computer is dead.

Of course it again is even more complex than that.


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