Building Peak and Hold output counters: HW and SW required?

Hello,
I am using the 2 counter outputs of USB-6211 and PCI-6602 to drive injectors with PWM commands at rather slow frequencies (up to 10Hz) --- see top picture in the attached file. What I would like to do now is to drive Peak-and-Hold injectors (as shown in the below picture). I wonder if such profiles can be programmed or set in the hardware at the beginning of a test then reset everytime the users want to change the current settings (this latter does not need to be in real-time).
Can I achieve this with my hardware, do I need specific hardware? Is the only solution to build the train of impulsions and send it in a sort of time-based way? I do not really see the SW related that I must use.
Thanks for any insight.
Christophe
Attachments:
P&H command.doc ‏34 KB

Hello,
If you really need the exact pattern to be completely accurate up to 0.1%, then your pulse parameters should be able to change with maximally a 0.1% error.
This means that your pulse parameters should be updatable with an error smaller than 1 ms.
Therefore you cannot use Non-Buffered Pulse Train Generation (Implicit timing), because in that case changing your pulse parameters would be done software-timed. This type of Pulse Train Generation can be performed on STC 2 - and STC 3 - chipsets.
Because a computer only has an accurate 1kHz clock available, this would probably not fulfill your needs.
Two other options that could do what you are asking are Buffered Pulse Train Generation (with Implicit Timing) and Buffered Pulse Train Generation (with Sample Clock Timing).These options are only available on STC 3 - chipsets. These chipsets allow you to change your pulse parameters in a hardware-timed manner.
The 6211 card you mentioned is an M-series device and these devices use a STC 2 - chipset. Therefore it will not be possible to do a hardware-timed buffered pulse train generation.
As far as I know it will not be possible to do the hardware-timed buffered pulse train generation with the 6602-card.
I don't have one available over here to test it, but of course you can always test it at your side.
The examples to test this can be found the following way:
- Open LabVIEW and go to Help > Find Examples
- Select Browse and go to Hardware Input and Output > DAQmx > Generating Digital Pulses
- Here there should be two examples of the buffered Pulse Train Generation. (starting with "Gen Dig Pulse Train - Buff-... ")
- In the Requirements section they also mention the cards that do support this functionality.
Can you let me know if your test allows you to produce the wanted results?
Kind Regards,
Thierry C - Applications Engineering Specialist Northern European Region - National Instruments
CLD, CTA
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