NI PXI-6528 programming

I want to do a loopback test for a NI PXI-6528. It has 24 isolated input channels and 24 isolated output channels. I have a fixture that allows me to wrap each input pin to each output pin. So, bit 0 of Port3 (output) is wired to bit 0 of Port 0 (input). Ports 3,4,5 are outputs and Ports 0,1,2 are inputs. I'd like to basically walk a one down the 24 output bits and read each one individually at it's respective input. I setup two DAQmx Assistants (two tasks?) such that each task contains the individual channels (24 bits) of the input/output. The code I've attached is nowhere near complete, but merely a snippet of what I'd like to do. Ultimately, I'd like to automate this test, but initially, I'd like a control, say a 24 value boolean array that corresponds to each output bit, and a similar one for the input bits. I'd like to set a bit (or several) and say 'write' and see the respective Input booleans light up.
Can someone shed some light on how I can have bit level control of the I/O?
Attachments:
PXI_Out_2.JPG ‏101 KB
48Ch_Opto_Iso_IO.vi ‏111 KB
PXI_Out_1.JPG ‏54 KB

I had the DAQmx assistant generate code for both the input & output tasks. I then added some of the code you suggested in the previous message. Any idea why it would think the channel number in data vs task is different? I don't actually compare the output and what's read at the input yet, primarily because I'm not sure how. In general, I'm not sure how to (outside of a looping construct) specify one particular output and one particular input.
Attachments:
DAQmx_1.PNG ‏60 KB
DAQmx_2.PNG ‏29 KB

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I have found more information at this URL:
http://zone.ni.com/reference/en-XX/help/370471AC-01/cdaqmxsupp/pci-6528/
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Update:
I have found more information at this URL:
http://zone.ni.com/reference/en-XX/help/370471AC-01/cdaqmxsupp/pci-6528/
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Update:
I have found more information at this URL:
http://zone.ni.com/reference/en-XX/help/370471AC-01/cdaqmxsupp/pci-6528/
This is the C programming reference specific to the PXI-6528. Reviewing the Watchdog timer properties we find that the "Timeout" property can disable the timer with a value of -1. On the DAQmx Assistant GUI for DO, the Advanced Timing tab does have a Timeout property which will accept a value of -1; however, one must set the Generation Mode to N-Samples to activate the Timeout input field. As the 6528 fundamentally cannot generate samples, then we must reset the Generation mode back to 1-Sample (On Demand) with the effect that the Timeout property is greyed out on the GUI - does this signify that the -1 value for Timeout is ignored?

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Attachments:
One Loop DO DI.vi ‏102 KB
Producer-Consumer DI-DO.vi ‏106 KB

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