Dumb question: Difference between Digital Port versus a Digital Line?!

Hello All,
PLEASE excuse my numbskull question, but I can't find an answer to this question. What is the difference between a digital port and a digital line? I need to control some relay modules in our 2345 box. This works with digital line output, but I can also trip the relays using a Port write.
Any recommendations?
Thanks for all your input.
Max

Hello,
There are a few different ways that you can control your digital lines. You can use the DAQ Assistant or you can program by using the DAQmx VIs that the DAQ Assistant uses to generate its code.
Either way you will need to write to a digital line so your lines will need to be configured as digital outputs. There are a few good examples that you can use that are installed with LabVIEW. You can find these examples by opening up the Example Finder (Help>>Find Examples) and then browsing to Hardware Input and Output>>DAQmx>>Digital Generation.>>Write Dig Chan.vi. This example shows how to write the different lines on a port. You can also choose to write just one sample instead of N Samples. Depending on your situation you can change the polymorphic instance of the DAQmx Write VI and also change the line grouping constant from "one channel for all lines" to "one channel for each line" if you want to write in a different way. But you can at least start with this example and make any changes you like down the road.
Have a good day,
Brian P.
Applications Engineer

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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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Bes wrote:
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Because of the complexity of my query, I tried out a simple (really simple) example instead...
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890 rows selected.
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   4    1     TABLE ACCESS (BY INDEX ROWID) OF 'PART'
   5    4       INDEX (RANGE SCAN) OF 'PART_PK' (UNIQUE)
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       4559 bytes received via SQL*Net from client
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          0 sorts (disk)
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890 rows selected.
Execution Plan
   0      SELECT STATEMENT Optimizer=RULE
   1    0   UNION-ALL
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'PART'
   3    2       INDEX (RANGE SCAN) OF 'PART_PK' (UNIQUE)
   4    1     TABLE ACCESS (BY INDEX ROWID) OF 'PART'
   5    4       INDEX (RANGE SCAN) OF 'PART_PK' (UNIQUE)
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          0 redo size
      54543 bytes sent via SQL*Net to client
       4559 bytes received via SQL*Net from client
         61 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
        890 rows processed
timing for: query_timer
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Next, I tried the same 2 queries, but using the CHOOSE hint, since the explain plans above show that it defaults to using the RBO...
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890 rows selected.
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: CHOOSE (Cost=1840 Card=1071
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   1    0   UNION-ALL
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       4441 bytes received via SQL*Net from client
         61 SQL*Net roundtrips to/from client
          2 sorts (memory)
          0 sorts (disk)
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timing for: query_timer
Elapsed: 00:00:02.90(hint + in-line view)
890 rows selected.
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: CHOOSE (Cost=1840 Card=1071
           Bytes=57834)
   1    0   UNION-ALL
   2    1     TABLE ACCESS (FULL) OF 'PART' (Cost=920 Card=642 Bytes=3
          4668)
   3    1     TABLE ACCESS (FULL) OF 'PART' (Cost=920 Card=429 Bytes=2
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          0 recursive calls
          8 db block gets
      12367 consistent gets
      10850 physical reads
          0 redo size
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       4441 bytes received via SQL*Net from client
         61 SQL*Net roundtrips to/from client
          2 sorts (memory)
          0 sorts (disk)
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timing for: query_timer
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Thanks for your response. A few comments, and then a question:
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Of the WGB? Mine need configuration: SSID, encryption keys, etc. It's just like setting it up as an AP except for the mode you select.
Of a (non-)root-bridge? Mine have needed configuration in that mode, too. Same as above.
Not sure what you mean by "no configuration required".
# Disadvantages:
* Supports only a single wired client
Nope, in WGB mode pre-1200 units supported up to eight wired devices. 1200's and later support up to 250 clients. Cisco docs are clear on this.
In bridge mode I'm not aware of any wired client limits. The device is simply passing traffic between the two interfaces.
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Not sure what you mean by "not managable".
Back to my question: What is the difference between AP+client mode vs. root-bridge+non-root-bridge mode? Does the AP+client mode make more decisions about traffic routing or prioritization, while bridge-based operation is less "intelligent"? Something else?
My tests show no discernable difference in throughput, even with multiple clients/nonroot bridges. When multiple users consume bandwidth simultaneously, it is shared among them just as you'd expect.
So... what ARE the differences, as far as the decisions IOS is making, between the different modes?
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Dumb question: Difference between Digital Port versus a Digital Line?!

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