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PCI Express bus became more and more popular. PCIe has a new type of interrupts - MSI/MSI-X. Today VISA driver is able to work only with old style interrupts (Legacy).
Let me explain the main difference:
Legacy interrupt mask intA/B/C/D signals (these signals was in PCI bus, but not exist in PCIe bus). These signals (for PCIe actually packets with Message setA/B/C/D) are shared between all PCIe devices. So VISA driver spend a lot of time when it looks who produced this interrupt.
MSI interrupt is actually a Memory Write packet to preallocated address. In this case VISA should already know which device produced this interrupt. Also MSI interrupt can contain different interrupt vectors inside of Memory Write packet. So it would be very helpful to get access to vector value too.
Requesting MSI/MSI-X interrupts support to VISA driver.
The term "Incomplete Sample Detection" comes from DAQmx Help. It affects buffered time measurement tasks on X-series boards, the 661x counter/timers, and many 91xx series cDAQ chassis. It is meant to be a feature, but it can also be a real obstacle.
How the feature works ideally: Suppose you want to configure a counter task to measure buffered periods of a 1-channel encoder. You use implicit timing because the signal being measured *is* the sample clock. The 1st "sample clock" occurs on the 1st encoder edge after task start, but the time period it measures won't represent a complete encoder interval. Reporting this 1st sample could be misleading as it measures the arbitrary time from the software call to start the task until the next encoder edge.
On newer hardware with the "Incomplete Sample Detection" feature, this meaningless 1st sample is discarded by DAQmx. On older hardware, this 1st sample was returned to the app, and it was up to the app programmer to deal with it.
Problem 1: Now suppose I'm also using this same encoder signal as an external sample clock for an AI task that I want to sync with my period measurement task. Since DAQmx is going to discard the counter sample that came from the 1st edge, my first 5 samples will correspond to edges 2-6. Over on the AI task, my first 5 samples will correspond to edges 1-5.
My efforts to sync my tasks are now thwarted because their data streams start out misaligned. The problem and workaround I'm left with are at least as troublesome as the one that was "solved" by this feature.
Problem 2: Suppose I had a system where my period measurement task also had an arm-start trigger, and I depended on a cumulative sum of periods to be my master time for the entire system. In this case, the 1st sample is the time from the arm-start trigger to the 1st encoder edge, and it is *entirely* meaningful. On newer hardware, DAQmx will discard it and I'll have *no way* to know my timing relative to this trigger.
Older boards (M-series, 660x counter/timers) could handle this situation just fine. On newer boards, I'm stuck with a much bigger problem than the one that the feature was meant to solve.
So can we please have a DAQmx property that allows us to turn this "feature" OFF? I understand that it'd have to be ON by default so as not to break existing code.
We really need a hard drive crio module for long term monitoring and reliably storing large amounts of data remotely.
1. Solid State Drive: Fast, reliable, and durable. Extremely high
data rates. It would be a very high price module but it could be made to
handle extreme temperatures and harsh conditions. It should be
available in different capacities, varying in price.
2. Conventional Hard Drive: This would give any user the ability to
store large amounts of storage, in the order of hundreds of Gigabytes.
This type should also come in varying storage capacities.
For this to be useable:
1. It would need to support a file system other than FATxx. The risk of data corruption due to power loss/cycling during recording makes anything that uses this file system completely unreliable and utterly useless for long term monitoring. You can record for two months straight and then something goes wrong and you have nothing but a dead usb drive. So any other file system that is not so susceptible to corruption/damage due to power loss would be fine, reliance, NTFS, etc.
2. You should be able to plug in multiple modules and RAID them together for redundancy. This would insure data security and increase the usability of the cRIO for long term remote monitoring in almost any situation.
Current cRIO storage issues:
We use NI products primarily in our lab and LabVIEW is awesome. I hope that while being very forward about our issues, we will not upset anyone or turn anyone away from any NI products. However, attempting to use a cRIO device for long term remote monitoring has brought current storage shortfalls to the forefront and data loss has cost us dearly. These new hard drive modules would solve all the shortfalls of the current storage solutions for the crio. The biggest limitation of the cRIO for long term monitoring at the moment is the fact that it does not support a reliable file system on any external storage. The SD Card module has extremely fast data transfer rates but if power is lost while the SD card is mounted, not only is all the data lost, but the card needs to be physically removed from the device and reformatted with a PC. Even with the best UPS, this module is not suitable for long term monitoring. USB drives have a much slower data transfer rate and are susceptible to the same corruption due to power loss.
When we have brought up these issues in the past, the solution offered is to set up a reliable power backup system. It seems that those suggesting this have never tried to use the device with a large application in a situation where they have no physical access to the device, like 500 miles away. Unfortunately, the crio is susceptible to freezing or hanging up and becoming completely unresponsive over the network to a point that it can not be rebooted over the network at all. (Yes even with the setting about halting all processes if TCP becomes unresponsive). We would have to send someone all the way out to the device to hit the reset button or cycle power. Programs freeze, OS' freeze or crash, drivers crash, stuff happens. This should not put the data being stored at risk.
I would put money on something like this being already developed by NI. I hope you guys think the module is a good idea, even if you don't agree with all the problems I brought up. I searched around for an idea like this and my apologies if this is a re-post.
Just ran into a situation where I need to stream a lot of data to TDMS. The only problem is that I need to store additional metadata with the channels. I could go through all of the generated TDMS files and insert them after the fact, but this is kind of tedius. I propose a way to add metadata to the channel. My first thought was to use a variant input on the Create DAQmx Channel, but some of the polymorphics already have really fully connector panes. So I am now thinking to just add a property to the Channel Property Node that is just a variant. When logging to TMDS, the variant attributes can be put in the metadata of the channel. Do something similar for the group so that we can have additional group metadata.
Metadata that I'm currently thinking about could include sensor serial number and calibration data. I'm sure there is plenty of other information we would like to store with the TDMS file.
NI Terminal block layout should be designed so that wiring can be done straight from terminal to wire trunking.
For example TBX-68 has 68 wire terminals aligned to inside of the terminal block. This causes that each wire should make tight curve to wire trunking. Another problem with TBX-68 is that wires are heavily overlapped because of the terminal alignment.
Also the cables from terminal block to DAQ device should be aligned to go directly to wire trunking (not straight up).
For those of us who develop using DAQmx all the time, this might seem silly. Nonetheless, I'm finding that users of my software are repeatedly having a tough time figuring out how to select multiple physical channels for applications that use DAQmx. Here's what I'm talking about:
Typically a user of my universal logger application wishes to acquire from ai0:7, for example. They attempt to hold down shift and select multiple channels, only to assume that one channel at a time may be aquired. For some odd reason, nearly everyone fears the "Browse" option because they don't know what it does.
While, as a developer, I have no problem whatsoever knowing to "Browse" in order to accomplish this, I was just asked how to do this for literally the fifth time by a user. Thus, I'm faced with three choices: Keep answering the same question repeatedly, develop my own channel selection interface, or ask if the stock NI interface may be improved.
I'm not sure of the best way to improve the interface, but the least painless manner to do so might be to simply display the "Browse" dialog on first click rather than displaying the drop-down menu.
Please, everyone, by all means feel free to offer better ideas. What I do know for certain, though, is that average users around here continually have a tough time with this.
Many CAN protocols require a byte in a cyclic message to be incremented each time the message is sent (this is often byte 0). I might have read somewhere that this is possible with VeriStand but I am not using it. So when using only LabVIEW and the NI-XNET API, the only way to achieve this is to call the XNET Write function to manually set the value of this byte. But having to call the API each time the message should be sent removes all the benefits of cylic messages... Moreover LabVIEW can't guarantee the same level of speed and determinism (if the message is to be sent every 5ms for example).
Being able to configure a signal to be an auto-incremented counter would be a huge improvement. To me, this is a must-have, not a nice-to-have...
I often use one DAQ device to test the basic functionality of another device and like to be able to quickly do this through test panels. Unfortunately, MAX does not allow the user to open more than a single test panel at once. The current workaround for this is to launch the test panels outside of MAX (see this KB).
It would be nice to have the same functionality when opening test panels in MAX. Specifically, I would like to be able to do the following with a Test Panel open:
1. Be able to navigate through MAX to do things like check device pinouts, calibration date, etc.
2. Be able to move and/or resize the original MAX Window (it always seems to be blocking other applications that I want to view alongside the Test Panel)
3. Open a test panel for a second (or third...) device.
It is nice that there is a workaround in place already but I think it would be nice if MAX had this behavior to begin with.
I recently discovered that the SCXI-1600 is not supported in 64-bit Windows. From what NI has told me, it is possible for the hardware to be supported, but NI has chosen not to create a device driver for it.
I'm a bit perplexed by this position, since I have become accustomed to my NI hardware just working. It's not like NI to just abandon support for a piece of hardware like this -- especially one that is still for sale on their website.
Please vote if you have an SCXI-1600 and might want to use it in a 64-bit OS at some time in the future.
By default, DAQmx terminal constants/controls only show a subset of what is really available. To see everything, you have to right-click the terminal and select "I/O Name Filtering", then check "Include Advanced Terminals":
I guess this is intended to prevent new users from being overwhelmed. However, what is really does is create a hurdle that prevents them from configuring their device in a more "advanced" manner since they have no idea that the name filtering box exists.
I am putting "advanced" in quotes because I find the distinction very much arbitrary.
As a more experienced DAQmx user, I change the I/O name filtering literally every time I put down a terminal without thinking about it (who can keep track of which subset of DAQmx applications are considered "advanced"). The worst part about this is trying to explain how to do something to newer users and having to tell them to change the I/O name filtering every single time (or if you don't, you'll almost certainly get a response back like this).
Why not make the so-called "advanced" terminals show in the drop-down list by default?
It would be great if the full DAQmx library supported all NI data acquisition products on Windows, Mac OS X and Linux. The situation right now is too much of a hodge-podge of diverse drivers with too many limitations. There's an old, full DAQmx library that supports older devices on older Linux systems, but it doesn't look like it's been updated for years. DAQmx Base is available for more current Linux and Mac OS systems, but doesn't support all NI devices (especially newer products). DAQmx Base is also quite limited, and can't do a number of things the full DAQmx library can. It's also fairly bloated and slow compared to DAQmx. While I got my own application working under both Linux and Windows, there's a number of things about the Linux version that just aren't as nice as the Windows version right now. I've seen complaints in the forums from others who have abandoned their efforts to port their applications from Windows to Mac OS or Linux because they don't see DAQmx Base as solid or "commercial-grade" enough.
I'd really like to be able to develop my application and be able to easily port it to any current Windows, Mac or Linux system, and have it support any current NI multi-function DAQ device, with a fast, capable and consistent C/C++ API.
I find myself quite often needing to modify the DaqMX tasks of chassis that aren't currently plugged into my system. I develope on a laptop, and then transfer the compiled programs to other machines. When the other machines are running the code and thus using the hardware I have to export my tasks and chassis, delete the live but unplugged chassis from my machine, then import the tasks and chassis back in generating the simulated chassis. When I'm finished with the task change and code update, to test it I have to export the tasks and chassis, plug in the chassis, and re-import to get a live chassis back.
Can it be made as simple as right clicking on a chassis and selecting 'simulated' from the menu to allow me to configure tasks without the hardware present?
Currently there are only two options for acquiring +/-60V input signals:
NI 9221: 8-Channel, ±60V, 12-Bit Analog Input Modules ($582)
NI 9229: 4-Channel, ±60 V, 24-Bit Simultaneous,Channel-to-Channel Isolated Analog Input Modules ($1427)
I would like to see a new module provided that is identical to the NI9205 (32-Channel Single-Ended, 16-Channel Differential, ±200 mV to ±10 V, 16-Bit Analog Input Module, $881) but with an input signal range of ±60 V.
As someone who migrated entire product lines from PLCs to cFieldPoint platforms, and now is in the process of migrating further into cRIO platforms, I am finding some cRIO module selection limitations. One big gap I see in the selection is with analog in/out modules. A set of 2-in / 2-out analog modules would be very welcome, offering standardized +/- 10V or 0-20mA ranges. There are a many times in our products that we need to process just a single analog signal, which now with cRIO requires 2 slots be used, with many unused inputs and outputs (which just feels like a waste of money and space).
I love simulated devices, but one major drawback is the static nature of the simulated data. It would be awsome to have the ability to import real world data for playback in the simulated devices. Essentially analog input channels could take a waveform in or waveform file, digital in could take a digital file or even a popup probe for the input where the user can turn on/off digital lines or turn a nob on an analog line would be very nice to have. This would allow the programmer to capture real data that a system might expect to recieve and then run the daq application in simulation using daqmx simulated devices with the exact real-world data.