RE: Serial connection over Cat5 getting corrupted

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

That's interesting - I checked the wiring and I had used a pair for Rx/Tx.
=
The serial port is port 8 of an 8 port card (PCI).

I swapped it over to another PC and it seems to work perfectly!

Looks like either a faulty 8 port serial card or noise etc in the PC???

Paul.

> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
> Paul Gale
> Sent: 14 July 2005 09:17
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Serial connection over Cat5 getting corrupted
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> Thanks for the replies everyone :)
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> The power supply, baudrate etc are all fixed in the computer.
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> I haven't tried running Rx and Tx over twisted pairs though - I'm not
sur=
e
> which wires they're running on but I have a feeling they won't be on a
> pair! I'll try that first.
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> Thanks!
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> Paul.
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> > -----Original Message-----
> > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of
> > David Yeend
> > Sent: 13 July 2005 23:44
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] Serial connection over Cat5 getting
corrupted
> >
> > Certainly pairing the TX and RX with a ground shows an
improvement in
> > my experience. I can only think this is due to minimisation of
cross
> > talk, RS-232 is single ended and not balanced so you do not get
the
> > same common mode 'noise immunity' as with a technology designed
for
> > twisted pair, such as Ethernet or RS-485.
> >
> > I think it safe to assume that you already have the cat5 in place
and
> > want to use it - an alternative cable is probably least
favourable. If
> > 2 way comms is involved, status and control, and it is critical -
i.e.
> > you would like your fish to survive and loosing comms would
reduce the
> > likely hood of this, then I would not risk the possibility of
'just
> > getting by' on cat5. In my opinion there are too many
> > variables.....new sources of noise having unforeseen effects,
> > degradation of the interface electronics leading to attenuated
signal
> > or jitter etc.
> >
> > My solution would be either purchase one of the MSS100s and have
it
> > talk to a virtual com port, or (being more sociable) purchase a
pair
> > and have them talk to each other and provide a physical RS-232 at
Node
> > 0. Alternatively use a pair of RS-232 to RS-485 converters and
match
> > the line technology to the wire in use.
> >
> > Good luck.
> >
> > David
> >
> >
> > On 7/13/05, Paul Gale <groups@xxxxxxx> wrote:
> > > I've just wired up my aquarium computer (RS232) via my
structured Cat=
5
> > cabling back to node0. I guess there's about 10-15m in the run.
> > >
> > > The trouble is, I'm getting some corruption in the sent data
=96
> spurious
> > characters and line feeds missed off.
> > >
> > > Any ideas what I can do to improve the comms?
> > >
> > > Ta,
> > >
> > > Paul.
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> > >
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