> That sounds like part of your particular line discipline, rather than
> a generic part of all half duplex protocols?
Indeed. But the information needs to be made available by the serial hardware
in order that my line discipline can behave correctly.
rhw@MemAlpha.CX said:
> That should be part of the RS485 protocol itself, in one of two
> formats:
<deletia>
> Again, refer to the sources mentioned above.
I am referring to:
"Normative Parts of PROFIBUS -FMS, -DP, -PA according to the European
Standard EN 50 170 Volume 2", Edition 1.0, Profibus Nutzerorganisation e.V.
(PNO), March 1998.
As far as I recall (it's been a while since I actually read it), it says that
the end of a packet is signified by an idle time of 27 bit times on the wire.
Therefore, I would like some way to find out from the serial hardware when
such an idle period happens.
I don't expect this to be used by all line disciplines, but I would like it to
be made possible by whatever API we decide upon.
---- ---- ----
David Woodhouse David.Woodhouse@mvhi.com Office: (+44) 1223 810302
Project Leader, Process Information Systems Mobile: (+44) 7976 658355
Axiom (Cambridge) Ltd., Swaffham Bulbeck, Cambridge, CB5 0NA, UK.
finger dwmw2@ferret.lmh.ox.ac.uk for PGP key.
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