AIM Board (APX429 PCI-X), ARINC429 : Initialization of the different channels

Good evening everyone,
I would like to configure 16 channels (8 Tx and 8 Rx). In the given Labview llb with the drivers, there is a VI, API429CmdResetCvi.vi, that allows to reset the channels. By reading the Programer's Guide and the Software Lybrary reference Manual, it appears that this function gives the same reset configuration to all the channels, whether Tx or Rx. Am I right (please tell me no)?
So how do you do to set the 8 first channels as Rx and the 8 next as Tx (I know every channels of my board can be Tx or Rx) or another Tx/Rx combination?

Hello JM,
I've got a few things to mention, as well as some suggestions. First, how are you addressing your channels. The syntax for multiple channels can be written a couple different ways. "Dev1/ai0:5" will read from channels 0 THROUGH 5. Whereas "Dev1/ai0, Dev1/ai5" will read from channels 0 AND 5. Secondly, how are you grouping your input channels when they are read? This is determined by the 'fillmode' input to the DAQmxBaseReadAnalogF64 function. Also, what are you connecting to your channels? If you don't have anything connected, then all the channels will float to roughly the same voltage. If you short your analog inputs to ground, do you read 0V? Additionally, there are some wiring considerations depending on what terminal configuration you choose (Diff, RSE, NRSE). Here is a document on wiring and noise considerations. Hope some of this helps!
-Alan A.

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The 6602 and 6608 cards require a slightly different initialization of the
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series MIO. With this updated initialization of the MITE, there is no
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The information about the MITE initialization above supercedes the information in the April 2002 (or earlier) edition of the 660x register level programming manual. The manual is in the process of being updated and will be posted soon.
Christian L
Consulting Services - RLP
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Christian Loew, CLA
Principal Systems Engineer, National Instruments
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Hi Vishal,
I'll try to answer your questions as best I can.
1) It is definitely possible to preload data to the 32MB memory (per group) and start the acquisition after you have preloaded the memory. There are example programs on ni.com/support under Example Code for pattern generation and the 6534 that demonstrate which functions to use for this. Also, if your PC memory buffer is less than 32MB, it will automatically be loaded to the card. If you are in continuous mode however, you can choose to loop using the on-board memory or you can constantly be reading the PC memory buffer as you update it with your application environment.
2) Yes, your data will automatically be loaded into the card's onboard memory. It will however be transferred as quickly as possible to the DMA FIFO on the card and then transferred to the PC memory buffer through DMA. It is not going to wait until the whole onboard memory is filled before it transfers. It will transfer throughout the acquisition process.
3) Vishal, searching the example programs will give you many of the details of programming this type of application. I don't know you application software so I can't give you the exact functions but it is easiest to look at the examples on the net (or the shipping examples with your software). Now if you are acquiring 512 bytes of data, you will start to fill your onboard memory and at the same time, data will be sent to the DMA FIFO. When the FIFO is ready to send data to the PC memory buffer, it will (the exact algorithm is dependent on many things regarding how large the DMA packet is etc.).
4) If I understand you correctly, you want to know if you waste the other 6 bits if you only need to acquire on 10 lines. The answer to this is Yes. Although you are only acquiring 10 bits, it is acquired as a complete word (16bits) and packed and sent using DMA. You application software (NI-DAQ driver) will filter out the last 6 bits of non-data.
Hope that answers your questions. Once again, the example code on the NI site is a great place to start this type of project. Have a good day.
Ron

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Cont_Gen_Voltage_Wfm-Int_Clk-With_Updates_for_DSA.llb ‏161 KB

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AIM Board (APX429 PCI-X), ARINC429 : Initialization of the different channels

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