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Type: Posts; User: jschulze

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  1. Replies
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    BACnet has two types of COV subscription...

    BACnet has two types of COV subscription services: SubscribeCOV and SubscribeCOVProperty.

    SubscribeCOV is the most commonly used and the properties reported are predefined by the spec, based on...
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    The good news in all of this is that RS-485...

    The good news in all of this is that RS-485 transceiver technology is advancing and many manufacturers are now isolating their RS-485 circuitry. Isolation solves a lot of the RS-485 grounding...
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    I like the idea, but there are a lot of other...

    I like the idea, but there are a lot of other protocols that use RS-485 besides BACnet too. Also, communication protocol specification and conformance tests don't typically cover the physical RS-485...
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    You're exactly right, which is why there's not...

    You're exactly right, which is why there's not just one solution for how to ground all RS-485 networks. It depends on the devices being used, the location's (building's) grounding network, cabling,...
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    Yes, I would agree. Many manufacturers of RS-485...

    Yes, I would agree. Many manufacturers of RS-485 equipment, and even some techs that commission RS-485 networks, do indeed seem to lack an understanding of RS-485.

    I can't believe the number of...
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    There is quite a lot of information on RS-485...

    There is quite a lot of information on RS-485 available online. I've compiled a pretty large list of links, but here are some of the most useful. The first link is a basic FAQ on RS-485 and the...
  7. Could you have the vendor change the points from...

    Could you have the vendor change the points from AVs and BVs to AOs and BOs in the Desigo module? AOs and BOs are required to have the priority array property.

    Although, this is assuming that the...
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    The Modbus protocol does not support COV. Are the...

    The Modbus protocol does not support COV. Are the COV's you're talking about from the BACnet devices? If you're using COV's on BACnet, then they shouldn't be sending-receiving almost constantly. The...
  9. The BACnet spec does not require AVs or BVs to...

    The BACnet spec does not require AVs or BVs to have priority arrays. The priority array is an optional property for these object types. It's possible that the P2 to BACnet translator's AVs and BVs do...
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    There are actually 3 different version of the N2...

    There are actually 3 different version of the N2 protocol that can all co-exist on the same N2 bus.
    https://www.thes4group.com/faqs/is-n2-a-standard

    UNT controllers and VND devices communicate...
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    ICC's Mirius gateway supports Modbus RTU to...

    ICC's Mirius gateway supports Modbus RTU to BACnet MS/TP conversion. It's BTL Listed and is configured with the ICC Configuration Studio. The studio is free and there are tutorial videos available....
  12. I think this would only work if your laptop's IP...

    I think this would only work if your laptop's IP address for the WiFi adapter connected to WiFi router 1 is on a the same subnet as the BACnet router and JACE's.

    For simplicity, let's call the...
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    Have you confirmed the new ProtoNode works with...

    Have you confirmed the new ProtoNode works with YABE without the SC connected and you can see BACnet objects after discovering the device?

    If that still doesn't work, there is probably an issue...
  14. Yes, this has been a far more common scenario in...

    Yes, this has been a far more common scenario in my experience as well. Clients ripping out the P1 front end, replacing it with a BACnet front end, and using a P1 Master to BACnet Server gateway...
  15. From my experience, this type of scenario arises...

    From my experience, this type of scenario arises because the client's Apogee system is old and uses P1 to communicate on the FLN bus to existing field units. Since the new chiller only supports...
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    That seems to indicate that there is something...

    That seems to indicate that there is something wrong with the ProtoAir.

    If you receive a new gateway from Eaton-Cooper, try the same test with YABE and the new gateway to confirm it's operating...
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    Try completely disconnecting the ProtoAir from...

    Try completely disconnecting the ProtoAir from the SC and run new wires directly between your PC's RS-485 adapter and the ProtoAir only. Does YABE communicate successfully when doing this?
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    Just to confirm, when you are testing with YABE,...

    Just to confirm, when you are testing with YABE, are you making a direct connection between your PC's RS-485 adapter and the ProtoAir (i.e. the SC is not connected)?

    As an additional confirmation...
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    Just to clarify, a cable drain wire is typically...

    Just to clarify, a cable drain wire is typically used for earth grounding the shield of the RS-485 cable in one location only to provide better immunity to EMI (noise). This is very different from...
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    I think when the log in YABE shows the word...

    I think when the log in YABE shows the word "Garbage", this means that it received a packet that is not a valid BACnet packet. If you weren't able to discover the device at all, I would say that you...
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    Before connecting the RS-485 references together,...

    Before connecting the RS-485 references together, you may want to use a laptop, USB to RS-485 adapter, and YABE to confirm that the ProtoAir will communicate at all.

    If you're still having...
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    Did the SS show successful token passing between...

    Did the SS show successful token passing between the two devices or was no communication happening at all?

    The ProtoAir's RS-485 terminal block has a "GND" terminal next to its + and - terminals....
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    What were the results of the serial spy? Is the...

    What were the results of the serial spy? Is the SC sending discovery commands? Is the gateway responding at all? Are there garbled packets?

    I'm not sure what Trane terminators are, but typically...
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    Great, that rules out your wiring and your USB to...

    Great, that rules out your wiring and your USB to RS-485 adapter. What tool were you previously using that you saw the malformed packets? Is it possible you just configured it incorrectly, for...
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    I just tested the latest Wireshark (3.2.6) on...

    I just tested the latest Wireshark (3.2.6) on Windows 10 64-Bit with YABE's MS/TP BACnet Capture tool and everything works as expected.

    Malformed packets leads me to believe you've either got a...
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    This could be a logical or timing issue with the...

    This could be a logical or timing issue with the token passing from the first ATV630 to the second. The second VFD may not be responding to the token pass, and so the first VFD sends the token to the...
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    Intermittent issues such as this can be caused by...

    Intermittent issues such as this can be caused by ground reference problems, overloading the bus, or by applying termination without proper idle biasing. Since I assume you only have the 9 LG units...
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    How many conductors does your RS-485 cable use, 2...

    How many conductors does your RS-485 cable use, 2 or 3? Is the cable shielded, if so how is the shield terminated? Is the cabling proper RS-485 cabling with a twisted pair and 120 ohm characteristic...
  29. I appreciate the sentiment, just glad I could...

    I appreciate the sentiment, just glad I could help!
  30. Regarding the destination port number for your...

    Regarding the destination port number for your read/write calls, I would guess that your BACnet client defaults to using 0xBAC0 (47808 decimal) when you specify only the target device's IP address....
  31. It depends on how your BACnet client software...

    It depends on how your BACnet client software uses the port number that you define and what settings are available for defining target BACnet devices. There are two port numbers in question - the...
  32. Yes, it is possible you may have issues if your...

    Yes, it is possible you may have issues if your BACnet client is opening UDP port 0xBAC0.

    Is there any way to disable your BACnet client from using 0xBAC0 or change the port to a different port?...
  33. It is not clear exactly what your BACnet client...

    It is not clear exactly what your BACnet client software means by "Shared Port". I can think of two possible meanings.

    1. "Shared Port" means an ephemeral port is used and the system chooses a...
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    I recommend the SharkTap network tap devices....

    I recommend the SharkTap network tap devices. They are a bit expensive, but make up for that in how simple and easy they are to use. As an added bonus, they block any traffic from your laptop from...
  35. In theory, this should be possible as long as...

    In theory, this should be possible as long as your Windows Service does not ever bind to the local UDP port 47808 and instead uses what is called an "ephemeral" UDP source port (i.e. automatically...
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    Since you would need to redesign your hardware...

    Since you would need to redesign your hardware anyway to add the relay output, you could also add BACnet MS/TP support at the same time using our PicoPort communication module. The PicoPort is BTL...
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    Yes, you would map the N2 objects to Modbus...

    Yes, you would map the N2 objects to Modbus registers using the ICC Configuration Studio. This tutorial video shows the general process (it's for Modbus to BACnet, but the same process applies for...
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    Andrei, Our ETH-1000 gateway can be used to...

    Andrei,

    Our ETH-1000 gateway can be used to bring an N2 Open device onto a Modbus/TCP network. The ETH-1000 is a general-purpose, multi-protocol gateway that is user-configurable via our ICC...
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    To me, this looks like a common-mode voltage...

    To me, this looks like a common-mode voltage fluctuation. Basically, the ground reference of one or more of the RS-485 devices is fluctuating in reference to your scope's (and JACE's) ground. I would...
  40. Thread: Siemens ?

    by jschulze
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    If you need to use the DXR2.M10PL-102B on a P1...

    If you need to use the DXR2.M10PL-102B on a P1 trunk, you can use our Mirius gateway to do the conversion from BACnet MS/TP to P1. The Mirius can be configured to emulate any P1 application. Details...
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    When you plug your laptop in, you are grounding...

    When you plug your laptop in, you are grounding your laptop to the outlet's ground and therefore your scope probes' grounds are also referenced to the outlet's ground. This is probably a very...
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    This certainly can cause issues by inducing...

    This certainly can cause issues by inducing voltage onto the RS-485 cabling if improper cabling is used and/or the shield is not correctly grounded. But if the cable is a twisted pair (is it twisted...
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    Assuming your scope is USB powered, you are...

    Assuming your scope is USB powered, you are essentially observing the network as an isolated RS-485 device would see it (if it's RS-485 reference was left floating). There will be a lot of garbage...
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    It looks like you have your C1 probe connected to...

    It looks like you have your C1 probe connected to + and C2 connected to -. Where did you connect the ground for each probe?

    The intermittent nature of the problem sounds like it may be due to a...
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    Yes, there is a version of the Dingo that uses a...

    Yes, there is a version of the Dingo that uses a Raspberry Pi, but look closely, it's actually the Raspberry Pi Compute Module, which is aimed at industrial applications and uses eMMC storage instead...
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    According to the Siemens installation...

    According to the Siemens installation instructions here https://www.downloads.siemens.com/download-center/Download.aspx?pos=download&fct=getasset&id1=A6V10277237 it looks like the product numbers are...
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    There is a version of BACnet designed...

    There is a version of BACnet designed specifically for RESTful services called BACnet/WS (http://www.bacnet.org/Addenda/Add-135-2012am.pdf).

    It seems that currently there aren't that many products...
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    Depending on the voltage output of the meter, our...

    Depending on the voltage output of the meter, our Mirius gateway may be able to perform the conversion from pulses to BACnet MS/TP. The Mirius has 4 I/O channels, 2 are configurable for 5V or 10V and...
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    It may be common to find gateways that only...

    It may be common to find gateways that only support bringing Modbus slave devices onto a BACnet network, as this is the most widely used conversion. However, there are many gateways that support both...
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    Yes, the Mirius supports both BACnet to N2 and N2...

    Yes, the Mirius supports both BACnet to N2 and N2 to BACnet. You can configure any protocol conversion combination from the list of available protocols for the Mirius using our ICC Configuration...
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