[time-nuts] hp 54600a and rs-232

[Bob Bownes]

Yup, set your program to 7E2 and test it.

I would fire up a terminal program like hyperterm and see if you can talk
to it manually before anything else. With only four baud rates to check, it
isn't too many combinations. Not many things support split baud rates
(different rate for rx and tx), but if it does, make sure they are the
same.

You can also try looping back the tx/rx pins on the rs232 port from the
computer to check that out standalone first. That should work at any baud
rate and parity setting.


Bob


On Tue, Apr 22, 2014 at 11:07 AM, Collins, Graham <CollinG at navcanada.ca>wrote:

> The scope has four choices for baud rate and otherwise is 8 databits, 1
> stop bit, and no parity.
>
> I am not sure I understand what you are suggesting with the 7E2 - set my
> program to use 7 data bits EVEN parity and 2 stop bits?
>
> Cheers, Graham
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of bownes
> Sent: April-22-14 10:48 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] hp 54600a and rs-232
>
> "Framing error" or "override" sounds like a parity or stop bit issues.
> Have you changed those at all? 7E2 often works when 8N1 is specified.
>
> > On Apr 22, 2014, at 10:34, "Collins, Graham" <CollinG at navcanada.ca>
> wrote:
> >
> > Thank you Thomas,
> >
> > I have that document but it wasn't of much help. I spent much time over
> the weekend reading through the various hp documents for this scope and
> interfaces but it did not shed any light on the subject.
> >
> > Cheers, Graham
> >
> >
> >
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> > On Behalf Of Tom Knox
> > Sent: April-22-14 10:28 AM
> > To: Time-Nuts
> > Subject: Re: [time-nuts] hp 54600a and rs-232
> >
> > This may help:
> > http://cp.literature.agilent.com/litweb/pdf/54652-97004.pdf
> >
> > Thomas Knox
> >
> >
> >
> >> From: CollinG at navcanada.ca
> >> To: time-nuts at febo.com
> >> Date: Tue, 22 Apr 2014 07:21:22 -0400
> >> Subject: [time-nuts] hp 54600a and rs-232
> >>
> >> While only related to time nuttery in the sense of the hp 54600a being
> an instrument (oscilloscope) which we nuts might use make some meaningful
> measurements, I am hoping that members of this list vast knowledge of many
> such instruments may be able to help or at least point me in the right
> direction.
> >>
> >> I recently obtained a hp 54600a digital oscilloscope in very good
> condition and while not a modern whiz bang high bandwidth and high speed
> instrument it is quite capable and compliments my old Tektronix 5440 scope
> quite nicely.
> >>
> >> My 54600a has the basic RS-232 interface module which seems to work OK.
> I am able to select "print screen" and send data from the scope to an HP
> plotter or printer - computer actually which collects the data stream and
> converts the hgl data into a png file using a simple script.
> >>
> >> However, my attempts at getting the scope to respond to commands via
> the RS-232 serial interface are for naught. I am using a USB to RS-232
> converter and an appropriate null modem cable. I don't have a proper serial
> port to try however.
> >>
> >> When I send commands to the scope it will display "framing error" or
> "overrun" or "rs-232 error (113)" or "rs-232 error (118)" (I can't find
> either error code listed in the hp documents).
> >>
> >> Being able to capture a "screen dump" is my primary concern and I am
> able to do so, controlling the scope via rs-232 as I might using a
> gpib/hpib interface is only secondary  but still, it would be nice to know
> why my limited attempts have so far not worked.
> >>
> >> Ideas? Comments? Suggestions?
> >>
> >>
> >> Cheers, Graham ve3gtc
> >>
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