[time-nuts] Prologix GPIB-USB vs. GPIB-LAN vs. NI was: AW:Prologix GPIB-USB vs. GPIB-LAN

Don Latham djl at montana.com
Mon Jul 6 19:17:17 UTC 2009


Prologix: Just for ducks, if there is room, there <ought> to be a
GPIB-address-addressed-parameter storage for, say, 5-6 devices?
Don

Prologix
>
> It is pretty straightforward to add a new command to turn on/off automatic
> saving of configuration parameters in the next firmware update.
> ETA is a week or two. Please email support at prologix.biz if you like to be
> notified when the update is available.
>
> Firmware updates may be downloaded from http://prologix.biz
>
> Thanks for all the feedback!
>
> Regards,
> Abdul
> Prologix
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Samuel D. [x86/CPC]
> Sent: Monday, July 06, 2009 10:08 AM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Prologix GPIB-USB vs. GPIB-LAN vs. NI was:
> AW:Prologix GPIB-USB vs. GPIB-LAN
>
> Damn, that's a big flaw.
>
> The software I'm working on send three "++addr" commands per second.
>
> Only 4 days @24h/day to reach the limit :-/
>
>
> -----Message d'origine-----
> De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
> part de Mark Sims Envoyé : lundi 6 juillet 2009 18:54 À :
> time-nuts at febo.com
> Objet : [time-nuts] Prologix GPIB-USB vs. GPIB-LAN vs. NI was: AW:
> Prologix
> GPIB-USB vs. GPIB-LAN
>
>
> The Prologix adapter has a ++addr command for changing the GPIB address.
> You can select different instruments that way.
>
> Unfortunately, the version I looked seems to have a potentially fatal
> flaw.
> When you change the ++addr,  the device writes the internal microprocessor
> EEPROM.  The EEPROM is speced a 1 million write cycles.  If you changed
> instruments at once a second,  in under two weeks the chip could be toast.
> My app could have worn out the chip in under a day...
>
> All this assumes that Prologix did not implement some sort of elaborate
> wear
> leveling scheme in their software,  but I suspect not.  They seem to have
> intended one to set up the device to talk to one instrument then save that
> configuration in the chip.  Dynamically hammering the thing to death with
> address changes was not the intention of the ++addr command.
>
> I wound up implementing  a GPIB controller (with Prologix emulator) with
> my
> MegaDonkey touch screen LCD controller.  It even included a HPGL/PCL
> plotter
> routine to draw instrument plots on the 160x80 LCD.
>
> ----------------------------------------
>
>
>
>
>
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-- 
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com




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