[time-nuts] OT: Prologix GPIB and HP3478A...

Chuck Harris cfharris at erols.com
Wed Nov 28 06:17:34 EST 2007

Hi Didier,

I have exercised this problem both with kermit (a terminal emulator),
and with a Python script under linux.  It occurs both fast and slow.
At no time does the 3478A give any appearance that it thinks it is on
the bus.

I am pretty sure that the Prologix is, uhmmm, speaking out of turn.
It thinks the 3478A should be at a different point in the handshake
sequence than the 3478A thinks it should be in.  The main clue is in
that the Prologix restores itself when I disconnect it from the 3478A.

-Chuck Harris

Didier Juges wrote:
> Chuck,
> The commands I copied in my previous post were sent very fast. My program
> sends the strings automatically when I click on a button, so fast timing is
> perfectly acceptable by the Prologix/3478A combination.
> Let me know if you need me to give you any particular configuration
> information of my setup.
> I use a program I wrote in Visual basic under XP, but I cannot see why it
> would not work from the keyboard, even though I have not tried... I have
> tried from the keyboard with the HP 3456A voltmeter at one time when Abdul
> asked me for testing purposes (the Prologix did not completely lock out, but
> was clearly overwhelmed by the amount of data returned by the meter), and
> after Abdul added the ++read eoi command, it worked fine too.
> I know you use Linux, so this program won't do you any good, and I do not
> have a Linux box handy in the shack at the moment, but if you wanted to try
> it, let me know.
> Didier KO4BB

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