How to run two DAQmx Read (Analog) at the same time?

I would like to measure a voltage and a current,
but the two cannot be conbined in one task.
Therefore, I had to use two DAQmx Read in the same program. But it did not run.

Multiple channel types can be combined in a single DAQmx Read. One way is to use multiple DAQ Create Channel fucntions. Look at the posting here and the second example at the link in the answer.

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How to run two versions of any dreamweaver at the same time?
There must be a way to do this.

east99 wrote:
> How to run two versions of any dreamweaver at the same
time?
> There must be a way to do this.
Yes, there is: on two separate computers.
You cannot run two versions of Dreamweaver simultaneously on
the same
computer. They can coexist side by side, but the operating
system will
not let you run them together.
David Powers, Adobe Community Expert
Author, "The Essential Guide to Dreamweaver CS3" (friends of
ED)
Author, "PHP Solutions" (friends of ED)
http://foundationphp.com/

How to run two DAQmx Read (Counter in + Digital in) simultaneously?

Hello to all, i have following issue:
I want to acquire a digital (UART like) bus signal. For this purpose i use a DAQmx Card (PXI 6070e). I need precise time information about time lenght of 0 and 1, so i use a counter. The counter is adjust to CI Semi Period(continuous samples) -> on the edge change i'll get a new measured time value. It works perfectly, but i newer know what kind of state (0 or 1) actually belongs to current value. Of course they changing with each edge, but i need to know that exactly. So i should take a digital input which watching the current state. Unfortunately i can not synchronise two DAQmx-reads.
Finaly i should get two values:
time value(counter) and his state(digital in
) to work with them. How can i do this?
I use LabView 7.0

[SRQ 211371]
This is not a trivial taks but here is one way to do what you explained with a PXI-6070E and some external circuitry:
1. Use buffered semi period measurement to measure the width of your pulses.(Meas Buffered Semi-Period-Continuous.vi)
2. Use a buffered continuous analog data acquisition with external scanclock (e. g. Cont Acq&Graph Voltage-Ext Clk.vi). Maybe you should use a triggered example to start the acquisition at a defined time.
Now you could connect your signal to the ScanClock input (PFI7) of the 6070E but then you only would acquire only a sample at either the rising or the falling edge. As you need a sample at both edges you need some external circuitry that generates a short positive TTL pulse at each edge (rising and fa
lling).
Sorry that I can't provide a solution for this circuitry but I'm pretty sure something like this should be available as a low cost IC.
You may want to allow your signal some settling time after the scanclock pulse has occurred. In this case simply acquire data on two AI channels. The first channel is only a dummy channel. Connect your signal to the second channel. The delay can be adjusted with the interchannel delay.
If anybody knows a good solution for the external circuitry or if anybody has a better approach please post it here.
Best regards,
Jochen Klier
NI-Germany

FEBA - How to post two or more transactions at the same time?

Hi,
    one of our banks sends the statemets with many lines that belongs to the same transaction. We have to post partially one line, and afterwards the other line. Any of you know how to post two lines at the same time from the bank statement?
Thank you in advance,
Miguel

Hi,
I'm sorry for replying so late.
The solution I reached was to change the a few things in the standard.
Now I have a new "context menu item". I select two or more transactions and I right-click the mouse. I select that "context menu item" and the next part of the code adds the total amount of the transactions to look for the correct post for the first transaction. Once posted automatically, the next transaction is posted automatically by the system.
I hope you understand my English. I've problem with technical FI terms.
Here you are the code:
First I added a new contextual menu item:
CL_FEBAN_ALV_GRID=============CCIMP
call method e_object->add_function
    EXPORTING
        fcode = 'BS_POST_ITEMS'
        text = text-002.
*{ INSERT DHTK904078 1
*--> Miguel Estu00E9vez - 16/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    call method e_object->add_function
        EXPORTING
            fcode = 'ZBS_POST_ITEMS'
            text = text-Z02.
*<-- Miguel Estu00E9vez - 16/06/2008
*} INSERT
    call method e_object->add_function
        EXPORTING
            fcode = 'BS_KILL_ADVICE'
            text = text-004.
CL_FEBAN_ALV_GRID=============CCIMP
when 'BS_POST_ITEMS'.
    call method cl_feban_propagator=>raise_event
        EXPORTING
            i_event = 'POST_ITEMS'
            i_ref_to_item = l_ref_to_item.
*{ INSERT DHTK904078 2
*--> Miguel Estu00E9vez - 16/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    when 'ZBS_POST_ITEMS'.
        call method cl_feban_propagator=>raise_event
            EXPORTING
                i_event = 'ZPOST_ITEMS'
                i_ref_to_item = l_ref_to_item.
*<-- Miguel Estu00E9vez - 16/06/2008
*} INSERT
    when 'BS_LOCK_ITEMS'.
        call method cl_feban_propagator=>raise_event
            EXPORTING
                i_event = 'LOCK_ITEMS'
                i_ref_to_item = l_ref_to_item.
CL_FEBAN_PROPAGATOR===========CM001
    when 'POST_ITEMS'.
        raise event post_items
            exporting i_ref_to_item = i_ref_to_item.
*{ INSERT DHTK904078 1
*--> Miguel Estu00E9vez - 16/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    when 'ZPOST_ITEMS'.
        data: zvalor(1) value '' .
            export zvalor from 'X' to memory ID 'ZFEBA01'.
            raise event post_items
                exporting i_ref_to_item = i_ref_to_item.
*<-- Miguel Estu00E9vez - 16/06/2008
*} INSERT
    when 'LOCK_ITEMS'.
        raise event lock_items
            exporting i_ref_to_item = i_ref_to_item.
Now, I proceed to calculate the total amount of the selected transactions to look for the correct one to post.
LNEW_FEBAF01
*     user parameter
        l_feban_position type c.
        field-symbols: <items> type item_tab_type.
*{ INSERT DHTK904077 1
*--> Miguel Estu00E9vez - 16/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    data: zvalor(1) value '',
        zkwbtr type kwbtr,
        kwb type kwbtr.
    import zvalor to zvalor from memory ID 'ZFEBA01'.
    if ( zvalor is not initial ).
        if not i_ref_to_item is initial.
            assign i_ref_to_item->* to <items>.
            loop at <items> into h_item.
                select single kwbtr
                    into kwb
                    from febep
                    where kukey = h_item-kukey and
                        esnum = h_item-esnum.
                        zkwbtr = zkwbtr + kwb.
            endloop.
        endif.
        export zkwbtr from zkwbtr to memory ID 'ZKWBTR'.
    endif.
*<-- Miguel Estu00E9vez - 16/06/2008
*} INSERT
    refresh g_picked_items.
    if not i_ref_to_item is initial.
        assign i_ref_to_item->* to <items>.
        loop at <items> into h_item.
            move-corresponding h_item to h_picked_items.
            append h_picked_items to g_picked_items.
        endloop.
    endif.
    submit rfebbu00 and return
        user sy-uname
        with anwnd = r_doc->*-anwnd
        with s_kukey in s_kukey
        with s_esnum in s_esnum
        with buber = g_posting_area
        with mregel = '1'
        with function = 'C'
        with mode = g_mode
        with p_bupro = g_bupro.
*{ INSERT DHTK904077 2
*--> Miguel Estu00E9vez - 17/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    if ( zkwbtr is not initial ).
        select single kwbtr
            into kwb
            from febep
            where kukey = h_kukey-low and
                esnum = h_esnum-low.
                zkwbtr = zkwbtr - kwb.
        export zkwbtr from zkwbtr to memory ID 'ZKWBTR'.
    endif.
*<-- Miguel Estu00E9vez - 17/06/2008
*} INSERT
    refresh s_kukey.
    refresh s_esnum.
    clear h_kukey.
    clear h_esnum.
endloop. "loop over all picked items
call function 'CUSTOMIZED_MESSAGE'
    EXPORTING
        i_arbgb = 'NEW_FEBA'
        i_dtype = '-'
        i_msgnr = '110'.
RFEBBU00
* original transaction currency provided and posting area = 2.
        ftclear-selvon = febep-fwbtr. "INSERT - mpEURO
    ENDIF. "INSERT - mpEURO
    CONDENSE ftclear-selvon NO-GAPS.
*{ INSERT DHTK903977 1
*--> Miguel Estu00E9vez - 16/06/2008
* RIPI 24/04/2008 - Conciliaciones
* Permitir conciliar mu00E1s de un apunte a la vez
    data: zkwbtr type kwbtr.
    import zkwbtr to zkwbtr from memory ID 'ZKWBTR'.
    if ( zkwbtr is not initial ).
        ftclear-selvon = zkwbtr.
        clear zkwbtr.
    endif.
*<-- Miguel Estu00E9vez - 16/06/2008
*} INSERT
APPEND ftclear.
** Begin of comment C5053248
* perform druck_buzei_ftclear using ftclear-agkon.

How to start two or more tasks at the same time?

Hi all,
I have few tasks setup to send analog and digital output to different channel with buffer and given sampling rate. I need to precisely control the timing of samples output to each channel. But if I start the task in labwindows
    DAQmxStartTask(taskHandle1)
    DAQmxStartTask(taskHandle2)
    DAQmxStartTask(taskHandle3)
they actually not start at the same time since they are exectued in sequence. I wonder how much time delay will be if I start each task in sequence. Also, is it possible to have 2 or more tasks started at the same time?
p.s. I think it will be easier if I could bind different channels to a single virtual channel but I don't think it is possible to create a signle virtual channel with analog channel and digitial channel.

RobertoBozzolo wrote:
I had success in doing something similar on the input side by sharing the same sample clock across the tasks with:
DAQmxCfgSampClkTiming (DigitalTaskHandle, "/Dev1/ai/SampleClock", 1000, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000);
In my application I had the power to have the same acquisition speed on all tasks, so that the sample clock could be same on all of them.
The conceptual framework is this one (pay attention to the step order):
Setup your AO task
Setup your DO task
Set the DO task to share the AO sample clock with the instruction given above
Start the DO task (IMPORTANT: it must precede the AO task start, so that DO task is started but does not generate samples)
Start the AO task
If you have different sample speed on the tasks, I suppose an alternative is to use a start trigger sharing some digital signal among them. I have seen examples that use a separate counter output as a start trigger.
Thanks a lot. It gives me a good information, I think that will help. I am encountering another sitution, if task1 is analog output with continuous samples with rate 100000 samples/second and task2 and task3 are a single digital sample (i.e. write only 1 sample to one digital line). In task1, I write continuous samples and there will be a spike (of 2.2V) at the time 1.2ms after the task started. And I want to write to the digital channels (task2 and task3) at 0.2ms before the spike was set in task1. In this case, there is only one sample written to DO task, so how does it work to use the sample clock source?
In your last suggestion, we could use tirgger but how does it help? Is there any example I can follow? Thanks.

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How to run two DAQmx Read (Analog) at the same time?

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