From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
03-31-2015 09:10 PM
I have FOUR GPIB Devices running on a NI PCI card on a single PC. The only problem with the GPIB Bus is it must be a sequential read. This forces me to read data one at a time and this isn't fast.
I found the NI GPIB-USB-HS.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/201586
This runs from a USB cable. Can I read four USB cables at the same time and cut my GPIB read by 75%?
Can anyone confirm? If you have multiple GPIB-USB-HS on a single PC, can you read all four GPIB Devices at the same time in Parallel? Or does the GPIB-USB-HS act just like NI PCI GPIB cards with Sequential reads?
I need to read four GPIB devices at the same time I'm hoping the GPIB-USB-HS will do this...any other suggestions?
Thanks,
Doug
03-31-2015 11:23 PM
04-01-2015 10:47 AM
Thanks Dennis,
So I was hoping to trigger all of my USB GPIBs at the same time and Read at the Same Time. My GPIB device takes about 1.5 - 2 seconds to trigger and read the data. The best I've been able to do with my PC GPIB card is connect four GPIB devices and take each trigger/read in sequence...so one trigger/read is taking about 8 seconds for the four GPIB devices.
I was hoping the USB was it's own controller channel and I could address each GPIB USB channel at the same time. If I could do this, then my time would be cut from 8 seconds to 2 seconds.
What you're saying is it doesn't matter if I have one PCI GPIB Card with four devices or if I have four GPIB USB HS on one PC, it will always read GPIB sequentially on one PC. Bummer. But, that helped me from purchasing additional equipment.
Are you saying I should first TRIGGER ALL FOUR GPIB devices, then READ all Four GPIB Devices? Currently, I'm Trigger/Read GPIB 1, then I Trigger/Read GPIB 2, etc... But I think you're saying I should try Trigger GPIB 1, Trigger GPIB 2, Trigger GPIB 3, Trigger GPIB 4, then Read GPIB 1, Read GPIB 2, Read GPIB 3, and Read GPIB 4. I'll need to try that.
Can anyone suggest something else? My test equipment has GPIB and I need to speed up the process. Anykind of GPIB controller switch that can read multiple GPIB devices at the same time?
Thanks,
Doug
04-01-2015 11:09 AM
04-01-2015 11:23 AM
What are these devices you are trying to control?
Do you need them all to trigger at the same time? If so, then you need a trigger line that goes between them all and then you send a pulse of some sort to send the trigger.
04-01-2015 12:01 PM
04-01-2015 12:54 PM
Hi Dennis,
I didn't know you could Trigger Read in GROUPS! That might be the answer I'm looking for! I've been doing it the wrong way. Take a look at the example below, is this what you're saying? I have GPIB addresses 1, 2, 3, & 4. I'm not near my equipment now, but, I'll test this theory on Friday! Thanks for your suggestion!
Thank you! I'll report my results later.
Doug
04-01-2015 01:05 PM