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Type: Posts; User: brnaul

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  1. Replies
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    "If you're a developer trying to build BACnetTM...

    "If you're a developer trying to build BACnetTM MS/TP devices, chances are you're struggling to make your MS/TP implementation work properly and inter-operate across vendors. Looking at the BACnet...
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    How old is the job? McQuay units used MicroTech...

    How old is the job? McQuay units used MicroTech controllers for a long time, and they used the Energyline(?) protocol. It used to be that BACnet and Lon were optional cards. Its been a while since...
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    I guess my point was that I do not think you can...

    I guess my point was that I do not think you can just go read any ol' data from one Lon VAV controller directly to another Lon VAV controller unless the specific SNVT's are in place to bind - not...
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    Reread what I said was silly. The things you say...

    Reread what I said was silly. The things you say in your last post ARE valid things for controlling a VAV controller - I specifically laid out a single VAV to VAV case because your original post...
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    There are BACnet devices supporting device level...

    There are BACnet devices supporting device level access to another device. You have to evaluate the services supported by the device / manufacturer - everyone here already knows that is an issue...
  6. Thread: VAV Controllers

    by brnaul
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    4,972

    It stands for Digital Management System. It was...

    It stands for Digital Management System. It was a name born way back in Robertshaw's history for their automation system. The term sort of morphed into the acronym used for the central panels such...
  7. Thread: new system?

    by brnaul
    Replies
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    1,227

    I'm not sure what your situation is there in...

    I'm not sure what your situation is there in terms of service. If you have a service company that you regularly deal with, or even the original controls contractor, and are happy with what they do,...
  8. I would think that the exception would be...

    I would think that the exception would be Unacknowledged or Repeated Unacknowledged for control. Using lighting and HVAC as examples, you would want a lighting controller to acknowledge a receipt of...
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    It depends much on the vendors system you use,...

    It depends much on the vendors system you use, and what you want to do with it.

    For most of the control programs, any exposure to programming languages helps, but is in no way required. The...
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    I do not know the Honeywell system, but Square D...

    I do not know the Honeywell system, but Square D breakers may be integrated using Modbus communications or the Square D Symax (I think) protocol. I interpret your post to suggest that the I/O port...
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    Does Johnson openly publish anything other than...

    Does Johnson openly publish anything other than the N2 Open protocol? That may not be open, but available to vendors who choose to support it - I am not sure what is required to get it. I gather...
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    What are the controls, and how much access do you...

    What are the controls, and how much access do you have to the programs inside? Without knowing the intended sequence of operation, it is likely the fan should already be running with a call for...
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    This may have already been said and obvious to...

    This may have already been said and obvious to some, but in an answer to the original question, LonWorks and BACnet go further than the communications protocol - they provide data definitions as...
  14. Thread: VAV Controllers

    by brnaul
    Replies
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    4,972

    I'm gonna dig way into my past. Since this is...

    I'm gonna dig way into my past. Since this is memory, results (and correctness) may vary.

    You will likely have to upload the microsmart databases from the affected controllers and view them to...
  15. Thread: links in bacnet

    by brnaul
    Replies
    15
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    2,757

    It is true that LonWorks network variables are...

    It is true that LonWorks network variables are more likely to indicate the use of the data if a vendor chooses to do it (and most do). If names such as nviSwitch01, nviAnalog1, ... are used, you...
  16. Thread: links in bacnet

    by brnaul
    Replies
    15
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    2,757

    You can place the Alerton VAV, and address it,...

    You can place the Alerton VAV, and address it, and it will participate minimally in the network segment that it is on. If it is an MSTP slave, it sits, awaiting a request, if it is an MSTP master,...
  17. Thread: links in bacnet

    by brnaul
    Replies
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    2,757

    The chiller and VAV should be able to go to any...

    The chiller and VAV should be able to go to any of the shown locations - mostly dictated by the media of the devices.

    In that network diagram, there are two levels of IP network shown. Typically,...
  18. Thread: links in bacnet

    by brnaul
    Replies
    15
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    2,757

    It really depends on the system that you are...

    It really depends on the system that you are using. If I get a chiller controller that supports BACnet, and I want to use the points from that, then I use the tools of the vendor of the primary...
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    Question about Lon...

    This is from a background not totally familiar with Lon, but of curiosity in how LonWorks plays into complex systems.

    How often do you encounter the situation where a job requires deviation from a...
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