My app is acquiring data using the modbus serial protocol from a
custom built modbus slave device. The issues I'm seeing are timeouts
waiting for a response from the slave device. When I say hiccup, I
mean three dropped modbus packets in a row with timeouts of 200ms
each. The slave device should definitely respond within that time.
The baud rate is 57600 and I am not using RTS/CTS.
--Rob
--- In "Eric Robishaw" <> wrote:
>
> Thanks, I'll keep an eye out for this.
>
> What kinds of hiccups are you experiencing? What are the specific
symptoms?
> What baud rate are you communicating at?
> Are you using the RTS / CTS lines on TTYS4 -- I've had issues with those
> lines (using PPP over that port in particular).
>
>
> Just out of curiosity, what is your edge device that you're reading via
> serial?
>
> E
>
>
> On Wed, Aug 6, 2008 at 11:01 AM, Robert <> wrote:
>
> > I'm using a TS7800. The data acquisition is on com3 (/dev/ttts4).
> >
> > I'm also getting some hiccups at various times throughout the day, but
> > consistently at 6:28am.
> >
> > -Rob
> >
> >
> > --- In <ts-7000%40yahoogroups.com>, "Eric
> > Robishaw" <eric@> wrote:
> > >
> > > Thanks for the heads up on that. I'm doing data acq via serial
port as
> > > well, so that's good to know.
> > >
> > > *Which model TS device do you have, and which serial port are you
> > using? *Makes
> > > a difference, b/c on the 7800, for example, COM1 & 2 (ttyS0, S1) are
> > handled
> > > by the UART whereas the others (ttts0-10) are controlled by the
FPGA.
> > >
> > > Eric
> > >
> > >
> > > On Wed, Aug 6, 2008 at 9:40 AM, Robert <rulbrich@> wrote:
> > >
> > > > Howdy All!
> > > >
> > > > I have a data acquisition program reading the serial ports on the
> > > > TS-UARTS. and everyday around 6:28am, the program has a hard time
> > > > getting any data off the serial port.
> > > >
> > > > Has anybody had this issue?
> > > >
> > > > I think I finally figured out what is causing the problem.
> > > >
> > > > The scripts in cron.daily run at 6:25am. The main things that
seem to
> > > > cause the problem are the find and man-db scripts which search the
> > > > filesystem.
> > > >
> > > > Could there be a conflict between the NAND driver and the serial
> > > > driver?? I thought this issue was resolved in the jun10 release.
> > > >
> > > > If you want to reproduce this problem, try reading from the serial
> > > > port and running: run-parts --report /etc/cron.daily
> > > >
> > > > Thanks!
> > > > Rob
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>
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