Checking Multiple Counters...

Hi there.
I have a website with about 40 different pages from my last trip.
I placed a counter on each page - and am wonderig how I can acccess a page where I can see all the counters.
My homepage only lists the top 5 pages - and I can't find a way to get at the others - other than going to the page itself...
Thanks,
SparkyCanada

If counting page hits and taking a look at your webtraffic are something that you would be interested in, my recommendation would be to take a look at http://www.statcounter.com .
This is a 3rd party (free) hit counter. You sign up for it online, then you are given a bit of HTML code that you insert into every page on your site that you want to keep track of. Fortunately for the HTML-challenged (like myself), there is a little software application called iComment that can insert the code to every page automatically...
http://web.mac.com/cbrantly/iWeb/Software/iComment.html
With statcounter you will have more information at your disposal than you ever imagined possible. Which pages and in what order people are clicking to and from. Where people are surfing from (country and website). People's IP addresses, screen resolution, browser version, OS version, etc, etc.
Oh and best of all....you can set it so that it doesn't count any of your own visits to your own pages!

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Simultaneously latching multiple counters (AKA "strobe")?

How do you simultaneously latch values in multiple counters, at arbitrary times, for later reading?
A physical system generates several kinds of events to be counted by different counters, none of which events are strictly periodic or mutually synchronized (most of them are radioactive decay events, on the order 10^-3 to 10^5 per second average). It is critically important to count them all. At somewhat irregular intervals a few dozen milliseconds apart, I have the opportunity to read the counts, and it is also critical that whenever I read them, the counts are all captured at the same time, though it is not important exactly when this time is or how close in time I read them. Note: it is defining the end of one count period and start of the next that is time critical - not returning the count value to the calling program, which can happen whenever convenient.
I've used other counters that have a strobe-and-latch feature in past versions of this system, including Advanced Micro Devices' Am9513 and the good old 8254. When a read opportunity happens, I programatically strobe the counters then read each one's latched values at leasure, while the counters themselves continue counting. But I haven't found strobe-and-latch in either of my two NI hardware systems or in any of the LabVIEW vi's, properties, or examples. Is it there someplace, maybe by a different name?
I haven't found an example vi that simultaneously buffers counts in different counters. But it looks like some combination of the "Count Digital Events-Buffered-Continuous-Ext Clk.vi" example vi and the "Duplicate Count Prevention" method described in my DAQPad-6259 docs might get me what I want, but I'm not sure. I've attached one of my attempts to make this work, "SimultaneousCountBuffering01.vi". I have a single benchtop signal generator sending a 1 kHz signal to my DAQPad, where it's wired to both counter source terminals. This vi reads both counters at slightly different times on an irregular schedule repeating at about a half second. But it also first drives a digital output line high and low. This output is physically wired to both counter gate terminals. The DAQPad docs say that when counting in this mode, the counter is always counting regardless of the state of the gate, but at every positive edge on the gate, the count is buffered for subsequent reading. It's not important whether the readings are cumulative or get rezeroed because it's easy to use a shift register to change this anyway.
But I haven't gotten this vi or others like it to do anything useful. In this particular version, the counter reads time out. Maybe this means there's nothing sitting in the counter buffer? The examples don't seem to show anything making the counter buffer counts, so I guess that's done by the property node selecting Duplicate Count Prevention counting mode. I've checked various combinations of the digital out line state in this vi, by the way, but still the timeout happens. In my other attempts the counts are always zero, or occasionally jump by thousands, or only one counter will occasionally see only one count. Simpler vi's (that don't attempt the Duplicate Count Prevention and don't get synchronized count values) do work, and the counters both count at the expected rate.
Am I on the right track, using Duplicate Count Prevention?
If not, what approach should I be taking?
Even if this is the wrong approach, I still wish the vi did something, and am curious what I'm leaving out. Anybody know?
Thanks!
Attachments:
SimultaneousCountBuffering01.vi ‏64 KB

I don't have LV handy here, but I took a quick look at your OneLoop and TwoLoop attachments. If I remember correctly (I may be mixing those up with a couple other things I looked at), you face the following significant issues:
A. Need dataflow sequencing to help enforce execution sequence. With multiple data acq tasks, it's very typical to use the wind the error cluster from one task to another as a means to enforce execution sequence.
B. Need an overall scheme that doesn't keep configuring, running, and clearing each task in a software loop.
Let me roughly describe an approach I'd suggest:
1. Create a "dummy" AO task solely for the purpose of using its sample clock as a strobe for buffering your edge counts. Configure it for Continuous Samples using DAQmx Timing.vi The sample rate you choose will determine how often count values are captured ("strobed"). You may also need to set the property to "Allow Regeneration", found under one of the DAQmx Property Nodes (probably either the Channel or Write node). Write an array full of 0 values to the output buffer using DAQmx Write. (The actual value doesn't matter to the program, but 0 volts should be a safe value if you've got anything wired to your analog output terminals.)
2. Create 2 similar edge counting tasks with your counters. Both should be configured to use a digital "Arm Start" trigger using a DAQmx Trigger property node. That will guarantee that they are sync'ed at time=0. When you call DAQmx Timing.vi, wire in the input that lets you specify sampling using the AOSampleClock.
3. My personal choice for getting them all started in the right order would go like this. The counters would use the falling edge of the AOSampleClock as an "Arm Start" trigger and the rising edge of the AOSampleClock as their sample clock. The counter tasks are started before starting the AO task. After starting the AO task, the falling edge of the 1st AOSampleClock will "arm" the counters to start counting their edges simultaneously. The rising edge of the 2nd AOSampleClock will "strobe" the count values into the counter tasks' data acq buffers. Each subsequent rising edge will buffer the next counts.
4. Duplicate Count Prevention may need to be specified if there's a chance you might not see any edges to count between 2 consecutive sample clock strobes.
5. When you read from the counter tasks, be sure to read the same # of samples from each task. Then you can subtract the arrays to get your count differences, knowing that the counts correspond to the exact same interval of time.
-Kevin P.

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I need to measure the cycle length of a pulse, calculate a delay based on this value, and then generate a triggered pulse with that delay value. The input and output pulses will be continuous. The best case would be to use the cycle length from one pulse in the calculated delay for the next pulse. One of my biggest problems has been getting the calculated delay value into the pulse specs.vi for the triggered output.
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Filipe,
The overhead is the problem I'm trying to get around.
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Hello,
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Hey Sneaky,
Here's a screenshot of the code I put together on how to use multiple counters. Also, take a look here for more information on how to sync multiple counters.
Message Edited by Knights Who Say NI on 02-02-2009 10:36 AM
Message Edited by Knights Who Say NI on 02-02-2009 10:36 AM
Message Edited by Knights Who Say NI on 02-02-2009 10:38 AM
-John Sullivan
Analog Engineer
Attachments:
4xcount.jpg ‏67 KB

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Here's the scenario: I have a 6602 card, and I need to do buffered event counting on five counters at once.
I can't use DAQmx, because the drivers don't support the 6602 yet.
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Attachments:
StartCTRsTIO.vi ‏80 KB

Hi M.J.
This example VI should exactly do what you want:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DC9F56A4E034080020E74861&p_node=DZ52325&p_source=External
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