Multiple Application Access on PCI-6503

I have two applications which would like to use a PCI-6503 card through the
NI-DAQ API. One of these applications runs as an NT service, the other as a
desktop application.
If the service application begins using the card first, the desktop
application fails miserably. If the desktop application accesses the card
first, everything works fine. I have experienced similar problems sharing
memory between service and desktop applications and had to change the
service application so it would use an empty DACL in the security descriptor
when it allocated the shared memory. Does the NI-DAQ software have a
similar problem?
Thanks,
Neal Stublen

Another guess, but information that might help.
I'm assuming the service starts as the local system account. Some driver
inherits credentials from the service running as the local system
account. These credentials are inadequate for the interactive user. But
when the interactive user launches the driver, the credentials are
adequate for the local system account.
My guess is that if you change the configuration of the service to start
w/ specific user credentials, then the problem disappears. Goto Control
Panel | Services | {service name} | Startup and change the user from
local system account to the interactive user. Don't check interact w/
desktop, rather change to a specific user and specify the user that will
log on to the system.
Randy Charles Morin [M
VP] - http://www.kbcafe.com/
Author of "Programming Windows Services"
http://www.kbcafe.com/047138576X
In article <[email protected]>,
"Neal Stublen" wrote:
> I have two applications which would like to use a PCI-6503 card
through the
> NI-DAQ API. One of these applications runs as an NT service, the
other as a
> desktop application.
>
> If the service application begins using the card first, the desktop
> application fails miserably. If the desktop application accesses the
card
> first, everything works fine. I have experienced similar problems
sharing
> memory between service and desktop applications and had to change the
> service application so it would use an empty DACL in the security
descriptor
> when it allocated the shared memory. Does the NI-DAQ software have a
> similar problem?
>
> Thanks,
> Neal Stublen
>
>
Sent via Deja.com http://www.deja.com/
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42 PFI_5
43 PFI_13
44 PFI_10
45 PFI_15
46 PFI_14
47 PFI_8
48 PFI_11
49 PFI_12
50 PFI_9
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I posted a followup, but I don't know if the original poster is even monitoring it.
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Two software-controlled registers determine which devices, if any, generate interrupts. Each of the 82C55A devices has two interrupt lines, PC3 and PC0, connected to the interrupt circuitry. On the PCI-DIO-96 and PXI-6508, the 82C53 device has two of its three counter outputs connected to the interrupt circuitry. Any of these 10 signals can interrupt the computer if the interrupt circuitry is enabled and the corresponding enable bit is set. Refer to the Programming Considerations for the 82C53 section for more information. Normally, the handshaking circuitry controls PC3 and PC0 of the 82C55A devices; however, you can configure either of these two lines for input and then use them as external interrupts. An interrupt occurs on the signal line low-to-high transition."
The pages following that section describe the interrupt control registers and give pseudo-code examples for configuring them.
Once we clear this obstacle, let's move on to your output questions.
[1] PCI-DIO-96/PXI-6508/PCI-6503 User Manual
http://digital.ni.com/manuals.nsf/websearch/6E8329494F3955528625758300678D55
Joe Friedchicken
NI VirtualBench Application Software
Get with your fellow hardware users :: [ NI's VirtualBench User Group ]
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Senior Software Engineer :: Multifunction Instruments Applications Group
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)

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