RE: [jModbus-devel] A question

[Proctor, K. <Kel...@al...>]

Dieter,

I'm sorry I don't fully understand what you mean by 'pack up "all-in-one".'

For creating a TCP<->serial Modbus gateway I think the sort of architecture
where the transport objects deal in full frames would be best.  This then
allows a relatively simple class to be created for this.  If we assume for
the example (and it would be likely) that the master is on the TCP end then
we have a class that just continually reads a frame from the TCP end, sends
it out the serial end, reads a frame back in the serial end (with a timeout)
and then sends that back along the TCP end and repeats.

With the 'whole frames' architecture I'm in favour of this would be a very
simple application to write really.  (It's one of the reasons I like that
architecture, but I still like being able to use streams up high as you
did.)

Cheers,

Kelvin


 

> -----Original Message-----
> From:	Dieter Wimberger [SMTP:wi...@oe...]
> Sent:	Friday, October 26, 2001 1:06
> To:	jmo...@li...
> Subject:	[jModbus-devel] A question
> 
> Kelvin,
> 
> I have got an important question. I took a more in depth look into serial
> communication matters, and I wonder if it makes sense to pack up
> "all-in-one".
> 
> A bridge between serial cabling and ethernet is one specific case where it
> is necessary, but the question is if it is not possible to come up with
> another construct that solves the same problem. Specifically if it isn't
> much better to decouple such a construct due to cycling etc. and have the 
> serial and the ethernet side running in seperate processes.
> 
> I just want to propose this question, because we had a lot of discussions
> on issues that would have been more clear with only one specific flavor in
> mind.
> Also we are at the right decision point, as we just started looking more
> in depth into serial communication.
> As a matter of fact there might be not enough share in behaviour and
> handling to keep a medium path that considers and satisfies design,
> resource and behaviour issues.
> 
> What do you think?
> 
> Regards,
> Dieter
> 
> PS: I do not want to express that it is impossible, I just like cross
> thinking and taking steps back and considering if what is done is really a
> good thing to do.
> 
> 
> 
> 
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