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Tom Bress

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About Tom Bress

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    Bowie, MD

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    LabVIEW 2018
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  1. Yes, it is a Dwyer Love Temperature Controller, the manual can be found here: http://www.dwyer-inst.com/pdf_files/e_90_bpc.pdf I can communicate with the device using the Dwyer software, which also tells me which parity, stop bits, etc. to use. But when I try the Plasmionique Serial Comm Tester I get the timeout error. I can open a port, but cannot read the coils or holding registers.
  2. Hello, Porter. I'm new to Modbus and I'm trying to use the Plasmionique Master library to communicate with a 2-wire RS485 device over a USB port. Do I need to have a 2-wire USB-to-485 converter, or is there a way in the Plasmionique library to configure the Modbus communication as 2-wire? Background: I'm trying to communicate with a Mellen furnace Love controller. I can communicate with it using the manufacturer's software, but whenever I try to use the Modbus Comm Tester in the Plasmionique library I keep getting timeout error (-1073807339). I'm pretty sure I've got the baud rate, p
  3. I'm trying to get up to speed with OO and I have a question. Here is the scenario: In a string-based state machine I have a long string constant representing my list of states, like a program with one state per line. I have a number of these "programs" in the code based on user input. I'm trying to convert this to an OO approach and am thinking of this string as an object called Program. Let's suppose I have three programs: Program1, Program2 and Shutdown. Here are two approaches I could take: 1. Create a Program class with a string control in the data. Then create three method vis:
  4. The book is by Craig Larman. I recommend it too, I'm reading it right now. The nice thing about the book is that he teaches UML and OO design principles hand-in-hand. He uses UML to model the conceptual system (domain model) and the OO software approach (design model). The UML visual serves as the "code", he very rarely shows what the code would actually look like in Java. So you can apply the principles directly to LabVIEW without a text-based language getting in the way. By the way, I love cow-orker. Every time I read "coworker", that's how I pronounce it in my head. QUOTE (neBulus @
  5. I remember seeing a sequel once called "Bambi's Revenge". Couldn't find it on You Tube, though.
  6. QUOTE (ASTDan @ Feb 18 2009, 04:11 PM) I'll be there! I may be late, but I'll be there!
  7. QUOTE (crelf @ Feb 18 2009, 03:39 PM) That's just what I intend to do. Well, maybe I'll fill the void with sleep, LabVIEW and some single-malt scotch! Actually, I don't want to pursue a career in plastics. I've had much more fun with my day job doing LabVIEW-related stuff. Currently I'm playing with the Wiimote vis available on the NI website. We give the senior mechanical engineering students an open-ended project involving accelerometers, this term I'm going to outfit our PCs with Bluetooth dongles and throw some Wiimotes in the mix. It will be interesting to see what the students
  8. Hello! I've been away from the forums for some time now but now I'm back. I've been making the final push on my doctorate and I'm finally done! I defended my thesis on Monday and the committee passed me. I'm walking around in a state of shock. I've been working on this for a long time while holding down a full time job as support engineer/lab manager here at the University of Michigan and it is hard to believe that it is finally done. If anyone wants to know about how to use particle image velocimetry to measure the velocity vector fields of polymer melts during injection molding, I'm yo
  9. How about a list of the "Most Dangerous LabVIEW Programmers"? :laugh: QUOTE (PaulG. @ Jan 13 2009, 03:59 PM)
  10. QUOTE (TobyD @ Aug 28 2008, 03:54 PM) Nice work. Your application fulfills the requirements and the spirit of the exercise. But I'm going to ask you to make one more attempt at it. In your solution you use a functional global to communicate between the loops. That works, but it is not the way that it is demonstrated in the Advanced I materials or in the LabVIEW Style Book. There is a way to set up the architecture so that you don't need the functional global. That makes the app simpler and in better style. You probably figured out that if the error occurs in the producer loop it is
  11. Dragging the thread kicking and screaming back to its original topic, the poll has closed and the results are in. 37% voted for 2 years, 33% for 3 years, 16% for 4 years, 12% for "Once certified, always certified". Twenty-four votes were cast.
  12. QUOTE (TobyD @ Aug 26 2008, 03:00 PM) I made the suggestion about the type def enum because it is my guess that that is what the CLA exam graders will be looking for. The enum is easily scalable, and the CLA project is supposed to be large enough that a string wouldn't be appropriate anyway.
  13. QUOTE (TobyD @ Aug 26 2008, 12:24 PM) I reviewed your vi and I have some constructive criticism for you. Normally I would have tried to PM you privately, but since you posted your solution publicly I'll make my critique public as well. I hope you don't mind! Your vi does perform as I specified, but now I realize that I wasn't quite specific enough about the P Error and C Error buttons. My intent was that the P Error and C Error buttons (and their corresponding event and case structure cases) only trigger the user-defined errors. The intent is that by pressing the button you introduce a
  14. QUOTE (Gabi1 @ Aug 25 2008, 03:52 PM) You can buy a product called http://www.novii.tv/' rel='nofollow' target="_blank">Novii Remote that will do what you are asking. Of course it isn't "DIY", but if you want something RIGHT NOW, give it a shot.
  15. I've been thinking about that "real programmers" thing. One of the great things about LabVIEW, IMO, is that it doesn't have that "programmers culture". Most LabVIEW programmers are engineers and scientists who use LabVIEW to do things, not CS types who argue about the purity of the language. But this also has its drawbacks. Because most of us are not CS types, we also don't have a background in things like programming style and programming best practices. That's why I think certification is important. Taking the certification training fills in the gaps. It teaches you about good style a
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