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sveremey

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Posts posted by sveremey

    ACC-59E3 jumper help

    in Power PMAC

    Posted

    Hi Steve,

     

    I don't quite have an ACC-59E3 on hand as I am working remotely. But I can confirm that per our manual jumpers 2-3 are for voltage sensing mode and jumpers 1-2 are for current sensing mode for the specified ADC.

     

    1. Can you clarify what you mean when you say "it seems to be backwards somehow". What are you seeing on your end?

     

    2. Are you able to decipher which pin is pin 1 on the PCB for the jumpers or is there no description?

     

    Kind regards,

    Shadi

     

    Shadi, thank you for your offer of assistance! I have good news, there is no issue with the card or the documentation, although it is very confusing because of the orientation and arrangement of the jumpers.

    We were supposed to have 0-10V devices on our system but they were actually 4-20mA devices, so it appeared that things were opposite when the were not. We resolved this as soon as we took a look at all components, so this is not a Delta Tau issue after all. Thanks again!

    ACC-59E3 jumper help

    in Power PMAC

    Posted

    Hello,

    I found this thread but I'm still having an issue on a system we're working on.

    http://forums.deltatau.com/showthread.php?tid=1005&pid=3878

     

    We have 2 ACC-59E3 cards in our rack, and we intend for one to be voltage inputs and the other to be current inputs. Following the manual and the post above, we set the jumpers to 2-3 on the desired "voltage" card, and 1-2 on the "current" card. This seems to be backwards somehow. Can anyone else confirm this? I can't communicate from the job site and I need to be back there tomorrow, hoping I can get some confirmation before I go in and have a look at it again.

     

    Thank you!

    Steve

    Checking for USB drive from code

    in Power PMAC

    Posted

    Hello,

    I have an application where we are logging data to a text file on a USB drive at /media/disk-0/

     

    This is working, the file is generated correctly. However, I need to know if the USB drive is connected or not. If I try to write the file when there is no drive I get some watchdog issues in the background.

     

    So, can anyone tell me how to detect this drive? I don't care if it is through PMAC script or C code, either will do. I don't need millisecond frequency checking either, I can schedule it every second or so.

     

    I have tried stat() and it seems to always say the directory is present even when the drive is removed. so this doesn't work:

     

    struct stat st;

    if(stat("/media/disk-0/",&st) == 0)

    {

    bUSB_Ready = 1;

    }

    else

    {

    bUSB_Ready = 0;

    }

     

    I've also tried adding a directory in the root of the USB drive, I can tell the customer they need that for it to work (so it would be /media/disk-0/LOGS or whatever). When I try to detect that I never see the drive, even when it is plugged in.

     

    Ideas welcome!

     

    Thanks, Steve

    ACC 11E chip replacements

    in Power PMAC

    Posted

    Hello,

    We previously stocked a few UDN2981 (or UDN2981A) in case a customer damaged an output, but we can't find them now. Is there a factory accepted replacement for these?

     

    The ULN2803 for the sinking setup seem to be easy to find still, but I can't find the UDN2981

     

    Thank you!

    Steve

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