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

Prologix support at prologix.biz
Wed Nov 28 10:18:05 EST 2007


Hi Jeff,

Most (all?) GPIB instruments use 7-bit data. You should be OK choosing
eot_char in the 0x80-0xFF range.

I agree though, your's is a cleaner solution.

Regards,
Abdul

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jeff Mock
Sent: Wednesday, November 28, 2007 1:04 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...


++eot_char is usually okay.  The particular problem I was hacking at the 
time was a screen dump from a Tek scope (TDS 754A).  The screen dump is 
an 8-bit binary file in a weird image format and you don't know exactly 
how many bytes are going to be dumped (~50k bytes), but it does set EOI 
with the last byte sent.

++eot_char doesn't work 100% since the chosen EOT character might be 
binary data or it might be the EOT character.  The reason I asked is 
that the solution would be cleaner if you could do a "++read eoi" and 
then issue some other ++ query command to ask if EOI was set on the 
previous read.

jeff

Prologix wrote:
> Hello Jeff,
> 
> Thanks for the compliments. Much appreciated.
> 
> You may configure the Prologix adapter (using ++eot_enable and ++eot_char)
> to send (append, really) a user-specified character to USB ouput when it
> detects EOI. By checking for the character you can determine if EOI was
> asserted.
> 
> Regards,
> Abdul
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Jeff Mock
> 
> 
> I have a slightly off-topic question about reads.  When issuing a 
> "++read eoi", is it possible to tell whether an EOI was actually 
> returned by the instrument or whether the read was terminated by timeout 
> or block size limitation?
> 
> jeff
> 
> 
> 
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