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Re-2: vrf RS232 HPUXvs PC

Question asked by VRFuser on Sep 30, 2001
That somehow sounds like problems I had in earlier years, that were due to the cable connection. Two things here:

1) Shielded cable, screen connected on one end only, otherwise you form a ground loop, i.e. a mighty antenna.
2) make sure to terminate the handshake inputs correctly. That sounds weird, because normally, you might have specifically disabled hardware handshaking in your program. Still, these open inputs can give you helluva hard time. Solution here: Connect the inputs to the adequate outputs on the same plug, like for a Null-Modem-cable.

Might be trivialities, but I found many of our clients that had done exactly this wrong!

Best Regards

Dipl.-Ing. Thomas Vauderwange
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PLEASE DO QUOTE THE SERIAL NUMBER OF MACHINES IN ALL YOUR COMMUNICATIONS.



-------- Original Message --------
Subject: Re: vrf RS232 HPUXvs PC (01-Okt-2001 14:03)
From:    heiko.degenhardt@sentec-elektronik.de
To:      tv@huber-online.com

> Hi Stan,
>
> * On Fri, Sep 28, 2001 at 03:35:40PM -0700, Stan Bischof wrote:
> > I am seeing several symptoms but the two strangest are
> > ...
> > I have verified all settings that I can think of- and basic comm
> > works but is flaky as outlined above.
>
> That really sounds difficult to track.
> Does it make a difference if you disable all that FIFO settings
> in windows (settings of the according com port)?
> Does it make a differenz if you increase or decrease the
> buffer sizes?
> Is that behavior somehow dependent of the used baud rate?
>
> If nothing helps I think you would have to use an oszilloskope
> to watch the activity of the ports...
>
> Rgds.
> Heiko.

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