Keep switch channel selected for multiple steps in a scan list

Hi,
I have 3 switches (PXI-2575), one to apply a source to a given line, one to apply a sink, a one to apply a DMM. I have all three switches triggering off each other as well as a DMM (PXI-4070). I apply a source to any given line with the source switch and then cycle through other lines using the DMM switch. Problem is i want to keep the wear on the relays of the source switch to a minimum (for each cycle through the DMM lines I'm selecting same source pin multiple times!). Is there a command for scan lists or some way of setting up the switches so that this can be done?
I thought it might be possible to use the debounce command ';' on its own to signify that i don't want to change the channel selection but this does not appear to work, the DMM times out whilst waiting for a trigger on the second reading. Simplified example scan list that i currently have:
Break Mode: No Action
Source Switch: ch0->com;;;;~ch0->com & ch1->com...
DMM Switch: ch100->com;~ch100->com & ch101->com;~ch101->com & ch102->com;~ch102->com & ch103->com;~ch103->com & ch100->com...
I've also tried selecting the same channel in subsquent scan list entries which flags up error saying explicit connection already exists between the channels.
So is the only possibility just to needlessly wear out the relays?!

Hi leon007,
I can understand your desire to keep the wear on the relays of the Source switch to a minimum. I have a few questions, but we should be able to get the application working without needlessly wearing out the relays.
1. Can I assume you are using NI-SWITCH to program this application? If you are using the NI-DAQmx Switch API, please let me know.
2. When you state "I have all three switches triggering off each other as well as a DMM", can I assume (leaving out the Sink switch for now) the scan advanced output of the Source switch (TTL0) is sent to the trigger input of the DMM switch (TTL0), the scan advanced output of the DMM switch (TTL1) is sent to the trigger source of the DMM (TTL1), and the measurement complete destination of the DMM (TTL2) is sent to the trigger input of the Source switch (TTL2)?
3. If you are still having troubles after this post, I would like to know the following so I can assist in testing the issue: What versions of NI-DAQmx and NI-SWITCH do you have installed?
OK, that's it for my questions. Now for yours. Unfortunately, the debounce command ';' didn't work because it is simply a dummy entry - without creating a connection no scan advanced signal will be sent. I've noticed this is not documented well in our help file, and I apologize for that. However, attempting to create a connection where one already exists should be an error. Either the user is attempting to redundantly connect channels (which shouldn't happen if niSwitch Get Relay Position is used), or there is a driver issue.
To keep the relay wear to a minimum, I want to suggest a couple of ideas.
1. Use only one trigger line for the DMM's measurement complete and one trigger line for all the switches scan advanced outputs. To use this option, it cannot matter in your application which switch operates first, and which operates last. The switch that always makes a connection (the DMM switch) will send a scan advanced output trigger with a set scan delay (configured in niSwitch Configure Scan Trigger) that should accommodate for all the switches. This option may add delay in your application, but you will save relay life.
2. Use the DAQmx Switch API and the '&&' command between seperate switch connections. In the DAQmx Switch API, you use just one scan list for all switch modules. For example, we would perform the example scan list entries you provided with the following scan list:
/Source/ch0->com && /DMM Switch/ch100->com; ~/DMM Switch/ch100->com & /DMM Switch/ch101->com; ~/DMM Switch/ch101->com & /DMM Switch/ch102->com; ~/DMM Switch/ch102->com & /DMM Switch/ch103->com; ~/Source/ch0->com & /Source/ch1->com && ~/DMM Switch/ch103->com & /DMM Switch/ch100->com...
The above connects the Source switch CH0 to COM, waits for the relays to settle, connects the DMM switch CH100 to COM, sends the scan advanced output signal, and waits for the trigger input before executing the next scan list entry. This method will keep an order to the madness, as you will have the power to decide which switch operates first, and which operates last.
Let me know if I assumed anything incorrectly or if neither option works for you!
Chad Erickson
Switch Product Support Engineer
NI - USA

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Solved!
Go to Solution.
Attachments:
IMAGE2.png ‏29 KB
IMAGE1.png ‏32 KB
IMAGE3.png ‏79 KB

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Once I am finished with my post production I export all the images to my sales presentation computer in JPG file format.
After the sales presentation I then want to be able to Star the images they purchased on my post production computer. Currently I have been doing this manually, although time comsuming not too bad when you are only talking 20 images. However this is not working for weddings when looking at 150-200 images.
This is what I have tried. I did an export of filenames from ProSelect. I then removed the suffix i.e. .jpg. In Lightroom I select the Filter Bar, Text, Any searchabe Text, Contains and then paste in the list of filenames. After quite a while it will come back and say no images found or it might come up with only the 1st image in the list. I have tried several combinations of formating the list of filenames and none seem to work i.e. spaces, commas, semi-colon, each filename in "".
If anyone can help me in this regard I would be very grateful.
Thanks
Tony

If you have the file names of the photos, you can simply paste the text containing the file names into the filter bar text search (set the filter bar to search by file name)
For example, here's a short list of filenames that I would paste into the filter bar if I was searching my photos
DSC_0417 DSC_0922 DSC_0924

Keep switch channel selected for multiple steps in a scan list

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