09-07-2005 01:03 PM
09-07-2005 04:07 PM
Phil E,
1s to make these 4 calls is very long. We have benchmarked the time for 1 call and 1.8ms without wait for settle and 11.5ms with wait for settle what you can expect. The time depends on what is running on your machine and the speed of the processor.
You can use one call to access all 4 devices. DAQmx connect has a "multiple device" personality that you can use to close multiple channels on different devices. The improvement will not be dramatic using a single call.
09-07-2005 05:01 PM
09-08-2005 08:22 AM
I think that the reason for the delay is due to the RS-232 communication to the SCXI-2000 chassis. The communication speed over RS-232 is much slower than what you would get with a directly cabled chassis (for example, to a PCI-4021 switch controller, a DMM, or a DAQ board) or even with a USB interface (for example, the USB-1359).
If the speed increase is important and you are able to switch from RS-232 to USB, I recommend moving to the USB-1359. It will work with your SCXI-2000 chassis.
09-16-2005 04:12 PM
09-16-2005 04:37 PM
Phil E,
I confirm that the USB-1359 works with the SCXI-2000. In fact I just set it up and I was able to actuate relays on the SCXI-1127 in a couple of minutes.
Here is what I did:
1) Inserted the SCXI-1127 in the SCXI-2000
2) Connected the USB-1359 to the back of the SCXI-2000
3) Turned on the SCXI-2000
4) Inserted the USB plug to my computer
I was able to see "found new hardware" and I was able to go into MAX and click on test panel for the SCXI-1127 to actuate relays
Note the SCXI-2000 will be recognized as an SCXI-1000 which doesn't make a difference.
Please try the steps above and let me know how you found out that the SCXI-2000 doesn't work with the USB-1359.
Guy Ferraro
Switch product Support Engineer
NI-USA
09-19-2005 10:03 AM
09-19-2005 11:38 AM
Phil E,
When the USB-1359 is detected, it creates an entry in MAX, creates the SCXI-1000 in NI-DAQmx Devices with an SCXI-1127 in Slot 4. You do not need to autodetect anything, the USB does everything for you, Do you see the SCXI-1127 created when you plug the USB cable to your computer?
To change the topology, right click on the SCXI-1127 just created and select property. I have nothing else connected to my 2000 except the 1127 and the 1359 on the back.
We do not mention the SCXI-2000 in the USB-1359 documentation but it works. What is the Service Request Number you created when you called Tech support. I need to correct the information they have. Thanks
09-19-2005 03:35 PM
09-20-2005 03:26 PM