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| GPIB controller confusion |
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| jpb:
I have a stack of instruments/power supplies that have GPIB connectors so I finally thought it would be a good idea to get a GPIB controller. I've read various posts on this forum and searched ebay and elsewhere and it all seems to be a bit of a nightmare. I bought a NI GPIB-ENET off ebay for £30 + £10 postage which seemed cheap and then I discovered it has a AUI rather than RJ45 ethernet connector so had to spend another £10 on a converter - I'm waiting for them to arrive but having poked around on NI forums it looks like you need a licence to use their driver and it won't run on anything newer than Windows Vista - though hopefully some linux drivers are available. I also bought a couple of GPIB cables which despite being cheap (RS ones on ebay) were still well over £30 for the pair. Most cables seem to be £50+ each even used on ebay except ones from China which probably are a bit dodgy (GPIB seems very sensitive to cables from what has been written on these forums). So I'm thinking I perhaps should spend a bit more on a GPIB-USB controller but the market seems to be swamped with fakes and they are pretty expensive ($200 for a used NI one that looks ok) but again it seems you need a licence for the software driver. Does this mean I can spend a lot of money on hardware and have no means to drive it. I've also looked at PCI cards which are much cheaper - I have a PCI slot in my Dell workstation - but again I am wondering about availability of drivers and whether a licence is needed? I see from a thread on here that you can make your own with EZGPIB (?) software, an Arduino and wiring your own connector but I'd rather buy something (reasonably cheap) if possible. Another alternative is the Prologix one which is quite expensive (£150 plus here in the UK) and from what has been written in some threads it seems that this is not fully compatible with various software libraries. It seems a very good way to waste a lot of money pretty quickly especially when you start buying cables! Some help/clarification would be appreciated - my questions are: 1.) Do NI drivers really need a licence and does not having a licence make the hardware useless? 2.) Is the Prologix converter any better than the DIY version (other than being much neater) and what do you miss out on if you use it? 3.) Should I avoid older PCI card based controllers despite their enticingly low prices? 4.) Are the various (probably fake) Agilent GPIB-USB converters ok even if they are fakes? Or should fakes be avoided at all costs? 5.) What is the best option for a simple plug in device that will work with modern operating systems (Windows 7 onwards, Linux Centos 7 on) that won't cost a fortune and won't require spending money on software licences? |
| Tony_G:
I picked up a GPIB-ENET to replace a E5810A I had but I ended up giving it away because the drivers wouldn't work on anything later than Win7. I now use a GPIB-ENET/100 and it's been very good for me. I also have one of those fake 82357B USB adapters and it has worked flawlessly as well. The primary reason I went to an NI adapter was that the HPAK ones didn't support enabling devices to become the controller-in-charge. I like the ENET one because I can use it from all my machines, including VMs. In terms of your questions: 1. No you don't need a license, you can download them freely from NI.COM 2. I have a Prologix that I don't use. I bought it to try and get a equipment initiated print working but it didn't work. The GPIB-ENET/100 works fine in this configuration. 3. I don't believe so but it would be up to the driver support if you want something modern. 4. The one I have seems perfectly fine and I've seen many posts saying that these work for people so if the price is right I wouldn't hesitate. 5. This really depends on what you want to do with the adapter - If you want to write your own stuff then you can pretty much use anything but if you're looking for 3rd party software to work then you need to stay with a mainline controller (Keysight, Agilent, etc) - You're looking for 488.2 or VISA support there really. TonyG |
| Bicurico:
"4.) Are the various (probably fake) Agilent GPIB-USB converters ok even if they are fakes? Or should fakes be avoided at all costs?" I bought my Agilent GPIB USB adapter from eBay. The seller was located in Singapore if I recall it right. It cost around 90 Euro, but I had to pay customs, so at th eend it came to about 140 Euro. The adapter came in a sealed Agilent box with CD and documentation. The adapter is refurbished: looks like new but on very close inspection I could tell it had been used before. The adapter works 100% spot-on and you can download the Keysight IO Suite for free. Take a look at my blog entry, where I discuss the connection to the R&S CMU200/CRTU with my software: https://vma-satellite.blogspot.com/2018/06/remote-control-of-r-cmu200-and-crtu.html I would definitely recommend this USB adapter! I don't think it is "fake". I think the box, documentation and seals are fake, but not the device itself. They probably got a huge batch of stock/used units and had new documentation printed. At least that is my guess. Regards, Vitor |
| chronos42:
I have some of these Agilent fake converters. These converters are fakes for sure, the packages and also the converters. I have four of this, one died after short time of use, the others are still working since more than a year now. Several hp-Agilent instruments (power supplies and ARB generators) are working perfectly, also an older tek scope (TDS 2014), Tektronix open choice software also is working with this converter and the Agilent/Keysight drivers. So all in all I can recommend this adaptor for a lot of tasks. But there is also one big downside: The well known ke5fx plotter emulator is not working with this converter. For this task the Prologix converter is the better tool. |
| jpb:
Thank you everyone for the responses. It makes things clearly. I've probably wasted a bit of money rushing in on the GPIB-ENT but perhaps I can run it on an old Windows XP IBM Thinkpad I have. I'll look into the USB solutions or perhaps a GPIB-ENT/100 if one turns up. |
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