Unable to get synchronization between PXI devices

[Adam_U]

Roger,

I have put a zip file of my 8184's hard drive at ftp://ftp.ni.com/outgoing/tempRT.zip

I am using the same hardware as you. The only potential difference is the revision of our hardware. Please reply back with the serial numbers for the boards you are using so I can verify our versions are the same.

Thanks,

-Adam

[Jimmie_A.]

Hello!

Why not ignore the SCXI part of your setup, don't have the HW installed and don't configure it in MAX either. That way we can rule out if the SCXI is the cause of the problems you are experiencing.

Regards,

Jimmie A.

Applications Engineer, National Instruments

[Roger Isaksson]

Jimmie and Adam,

I tried to start from a clean slate using Adam's system and with a bare minimum "software" and "devices and interfaces".
Still no luck. See the attached picture of MAX.

Below are the serial numbers:

PXI-1052: S/N: 1162EA3 P/N: 189550A-01 
PXI-8184: S/N (Sticker on the the back of the front panel): E069BC
PXI-6704: S/N (Sticker): 10E635F, S/N (MAX): 0x10E635F, P/N: 185825D-01
PXI-6602: S/N (Sticker): 11273EC, S/N (MAX): 0x11273EC, P/N:  185745G-01
PXI-6251: S/N (Sticker): E0974F, S/N (MAX): 0xE0974F, P/N: 191325B-03

Regards

Roger Isaksson, Damill AB

Edit: Picture was changed from .bmp to .jpg.

Message Edited by Roger Isaksson on 09-27-2005 05:29 AM

[Roger Isaksson]

Jimmie,

I haven't tested the empty chassis yet. However,

The NI Sweden's E-series PXI-6070E (S/N MAX 0x10C38BF) and the PXI-6602 can be synchronized (The DAQmx 7.5 and LV RT 7.1.1 seem to detect E-series cards now)! When configuring the SCXI modules the chassis emits a "click", that wasn't present before.

When using the Our M-series 6251 and NI Sweden's 6281 (S/N DE81B1 P/N 191501A-03) the problem persists.

Regards

Roger Isaksson

[Roger Isaksson]

Jimmie,

I have tested with no SCXI modules in the chassis and with the E-series card synchronization works, with the M-series it does not. There is a "click" sound when the E-series card is present in the chassis.

Regards

Roger Isaksson, Damill AB

[Jimmie_A.]

Hello Roger and Adam!

It sounds really weird that your E-series device works but not your M-series. I will do some basic research today (or tonight is more correct) and hopefully we will be able to solve it tomorrow.

Regards,

Jimmie A.

[Salvador_Santolucito]

Jimmie,

I spoke with some HW engineers and I found something that may be causing the problem.  M Series use 3.3v for RTSI and PXI Triggers where E Series boards use 5v.  So for the case of driving a 6602 (5v) with an M Series (3.3v) you have a smaller margin of error (TTL High is 2.4 volts).  We've never seen a case where this was a problem before, but if you have some reflection or other sources of signal degration then it might be an issue.

I would suggest the following:

1) Try your application with slowing the M Series clock WAY down (i.e. 10 Hz)

2) Try it with your M Series boards in different slots (try all of them)

3) Remove all boards except the 6602 and M Series

-Sal

[Roger Isaksson]

Hello guys!

Can you look at this code!

Regards,
Jimmie & Roger

Message Edited by Roger Isaksson on 09-28-2005 09:52 AM

[Adam_U]

All,

Upon further investigation, we discovered that the 1052's backplane trigger lines are out of spec. R&D is actively working on a fix and we will send notification letters for repair or replacement once a fix is available. E-series and other 5V triggering modules will work with the 1052 chassis in most cases. Driving triggers with M-series or other low-voltage triggering modules will likely exhibit the problem.

If you are experiencing this issue and would like more information, please contact support@ni.com and ask to speak with the PXI group about the 1052 backplane triggering issue.

Thank you,

Adam Ullrich
PXI/VXI Product Support Engineer
National Instruments