Why does +5V LED on BNC-2090 not light up when connected to PCI-6602?

[akw@NI]

Hello,

I have a PC with both a PCI-6014 and a PCI-6602 installed. When I attach the SH68-68-D1 cable between the PCI-6014 and the BNC-2090, the +5V LED lights up. However, when I attach the cable between the PCI-6602 and the BNC-2090 it does not light up. I tried swapping the cards to see if there is a problem with the PCI slot occupied by the PCI-6602, but the result was the same.

I found the solution page entitled "Improperly Grounded DGND2 Terminal When Using BNC-2090 with M-Series DAQ Devices" but the PCI-6602 is not an M-series board, is it?

Many thanks,

Adam

[Mark_E]

Hi Adam,

I love the fact that you posted that KB as a starting point. That was very helpful and served as a great springboard for tackling your question.

The issue is almost identical to using an M-series: the pinout is different and one of the pins doesn’t tie to a DGND. If you’ll look at the pinouts in Measurement & Automation Explorer (MAX) by right-clicking the device and choosing “Device Pinouts” you’ll notice that the 6014 has both pins 15 and 39 are DGND signals. However, the NI 6602 (found by scrolling down the tree on the left-hand side) has pin 39 as DGND, but pin 15 is a PFI line. The M series has just the opposite phenomenon, but the result is the same: one of the lines isn’t connected to DGND.

Advice: manually short the pins together as suggested by the KB.

Feel free to post back to let everyone know how it turns out.

[akw@NI]

Hi, Mark.

Thanks for the response! My apologies for taking so long to get back.

So it seems the problem is more complex than just shorting pin 15 to DGND. Comparing the pinouts for the 6014 and 6602, I also noticed that the 6602 has +5V on pin 1, while the 6014 has FREQ OUT on pin 1 and +5V on pins 8 and 14. With the 2090 connected to the 6602, I shorted the FREQOUT and +5V block terminals on the front of the 2090 and sure enough the +5V LED turned on.

What I need is a pinout/circuit diagram for the 2090. If it is the same as the pinout for the 6014, then counter inputs 2, 3, 4, and 5 on the 6602 correspond to analog inputs 8, 10, 4, and 6 on the 2090, which would be sufficient for my DAQ requirements.

However, I still need to figure out how to power the 2090 from pin 1 while isolating pin 1 from pins 8 and 14 ... any ideas?

Take care,

Adam