--- "Peter C. Wallace" <[EMAIL PROTECTED]> wrote:

> 
> For a parallel port replacement Ethernet, maybe a thing to
> consider is just a 
> single point to point link to the (multi axis) endpoint and some
> very simple 
> master slave protocol. The slave would get a packet, unpack to
> hardware 
> registers, and echo a new packet or return data.
> 

I don't think RTnet is too complicated.  Have you looked at the
sample RTnet tcpdump
(http://www.erwinrol.com/downloads/software/rtnet.tcpdump.gz) with
wireshark?  There's some un-encapsulated UDP in that capture, but
the rest of it (ssh, tcp, etc) is encapsulated in rtnet.  For those
packets, it's just a few extra bytes to designate them as being for
RTnet.


Mark


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