http://www.modbus-ida.org/tech.php

j.

On Mon, Feb 27, 2012 at 9:48 PM, Chris Morley <chrisinnana...@hotmail.com>wrote:

>
>
> >
> > There may be a function that can look this up, but I think it's hard for
> > the API to know what network the app needs to use, although 99% of the
> > time the host has a single Ethernet port making the practical choice
> > easy. I got the libmodbus 3 unit-test demo to work by just doing a
> > ifconfig to to get my IP address and plugged that in. That's all that
> > was needed. RTU over TCP is probably a different story. My LinuxCNC
> > master could send queries just fine, but the unit-test slave isn't set
> > up to return anything interesting. Successes for unit-test demo seems to
> > be a lack of error messages.
> >
>
> CL requires the address and the port number (9502 id default).
> I somewhat understand the address but not really the port number.
> Can you elaborate how you found this info? keep in mind I have
> almost no knowledge of networks other then plugging in my ethernet cable
> in to my cable internet router. :)
>
> Chris M
>
>
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