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Trane BACnet MS/TP Installation, Operation And Maintenance Manual

Wiring and link performance, best practices and troubleshooting
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Installation, Operation, and Maintenance
BACnet
Performance
Best Practices and Troubleshooting
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.
December 2022
®
MS/TP Wiring and Link
SAFETY WARNING
BAS-SVX51L-EN

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Summary of Contents for Trane BACnet MS/TP

  • Page 1 Installation, Operation, and Maintenance ® BACnet MS/TP Wiring and Link Performance Best Practices and Troubleshooting SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
  • Page 2 (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs.
  • Page 3 Non-Trane personnel should always follow local regulations. Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

  • Page 4: Table Of Contents

    Tools ............22 Trane SerialSpy Protocol Analyzer Software ......23 Using SerialSpy With the Comm4 USB Adapter .

  • Page 5: Summary List Of Best Practices

    Total Number of Trane and Non-Trane Devices on a BACnet Link “Limit the quantity of devices on a link when there are both Trane and non-Trane devices on the link.,” p. “Populate BACnet® links evenly when 30+ devices are present.,” p.

  • Page 6: Overview

    ® The Trane SerialSpy Protocol Analyzer software looks at all the messages and activity on the BACnet MS/TP link. The ability to view the token passing is very useful for discovering link problems.

  • Page 7: Considerations

    • Two or more devices on the network with the same rotary switch address. Considerations Before troubleshooting the link, or contacting Trane Technical Support, it is helpful to have the following information at hand. • A valid set of prints for the project that illustrates how the devices are wired on the link (including rotary addresses).

  • Page 8: Best Practices

    • Tracer • BCI-I, BCI-R, BCI-C • Symbio™ 700 • Symbio™ 800 ® The electrical impedance value of Trane purple wire is less than the specified range. Trane has tested this wire and authorizes its use for BACnet MS/TP networks. BAS-SVX51L-EN...

  • Page 9: Network Wiring Configurations

    MS/TP link. Do not mix isolated and non-isolated device types on a single link. Trane recommends that isolated and non-isolated device types are not mixed on a single link. Run separate 2-wire and 3-wire MS/TP links.

  • Page 10: 3-Wire Mixed Device Networks

    Best Practices Figure 4. 2-Wire network with multiple isolated devices 3-Wire Mixed Device Networks Figure 5 describes the method for connecting one or more non-isolated devices to a 3-wire link. Notice that the reference wire is not connected to any terminal of the non-isolated device. Figure 5.

  • Page 11: Network Wiring Details

    Because the amount of communication signal degradation increases as the length of communication wire ® ® increases toward the maximum of 4,000 ft. (1,219 m), Trane requires that a Tracer BACnet Terminator (TBT) module (PN: X13651524-01) be connected at each end point of the network. For correct termination placement, follow these guidelines: ®...
  • Page 12 Use the built-in terminator on the BCI-R when the BCI-R is the last node in the network. ® The Trane BCI-R has a built in BACnet terminator. If a BCI-R is the last node on the network, this terminator should be installed as shown in the BCI-R installation guide (RF-SVN03*-EN). For other BCI- R devices that are not the last node on the link, verify that the terminator has not been wired to the network.
  • Page 13 Observe network cable and conductor termination best practices during installation. The following wiring practices are recommended: • Trane purple wire is acceptable 2-conductor cable and it is best practice to use this wire for non-isolated device network communications. 3-conductor cable is required for isolated device network communication. See Table 1, p.
  • Page 14 Best Practices ® Meet requirements when adding zone sensor communication stubs to a Tracer UC400/Symbio™ 500. The wire that runs from a zone sensor to a unit controller is commonly referred to as a communication stub. ® Figure 8 shows an example of communication stub-wiring to a BACnet device.

  • Page 15: Rotary Switch Values And Bacnet ® Device Id

    Best Practices ® Setting the BACnet Device Addresses ® This section describes the best practices for setting the rotary switch values on a BACnet MS/TP link. ® Rotary Switch Values and BACnet Device ID Rotary Switch Values The rotary switch value is the physical address of a device on a network. It is often referred to as the MAC address.
  • Page 16 Best Practices ® Figure 9. Rotary switch addresses and BACnet device ID example Link 1 BACnet device IDs UC400 UC400 3001001 and 3001002 Tracer SC+ 3rd Floor UC400 UC400 BACnet device IDs 3002001 and 3002002 Link 2 Link 1 UC400 UC400 BACnet device IDs 201001 and 201002...

  • Page 17: Setting Rotary Addresses On The Tracer ® Sc+ System Controller

    SC+ rotary switch value (1 to 419). ® • The Tracer SC+ BACnet MS/TP link number (1 to 2). • The unit controller rotary switch value (1 to 127). ® The three values are joined together to form the BACnet device ID for the unit controller.

  • Page 18: Device Id Assignment For Base Tracer ® Sc+S

    ID of the unit controllers being installed” checkbox (Figure 10, p. 18). As a result, the installed ® devices will retain their device IDs. This feature applies to Trane and non-Trane BACnet devices. ® Figure 10. Customize device IDs (Tracer...
  • Page 19 Set the rotary switch address on all unit controllers. ® All Trane BACnet unit controllers use the same method to set the rotary switch address of the device. On the front of the unit controller are three decimal rotary dials labeled with the word ADDRESS. Rotate the dial and position the arrow of each dial to point at the preferred number.

  • Page 20: Total Number Of Trane And Non-Trane Devices On A Bacnet ® Link

    19.2k baud will require all BACnet MS/TP devices on the same link be set to 19.2k baud. Baud rates that are lower than the Trane default of 76.8k baud will adversely affect the ® performance of the entire BACnet MS/TP link.

  • Page 21: Custom Programming

    Place Trane Communicating Thermostats on a separate link. Trane Communicating Thermostats (TCTs) may have communication issues when mixed on a link with Trane UC devices that use the 76,800 baud rate. To prevent this, place all TCTs on a separate link with a baud rate of 76,800.

  • Page 22: Controller Software

    The following software and hardware tools are available to help you troubleshoot your BACnet MS/TP link. Trane SerialSpy Protocol Analyzer Software to troubleshoot communication links. This software is available on the Controls Download page. High-performance volt meter. If possible, use a high-performance meter for best results.

  • Page 23: Trane Serialspy Protocol Analyzer Software

    The application is available to Trane technicians on the Trane Commercial Downloads page under Tracer SC+ (https://tranetechnologies.sharepoint.com/sites/softwaredownloads/SitePages/SC.aspx). If you have the Trane Updater Tool running on your PC, you can also use it to install Serial Spy. Important: If you have licensing issues with running SerialSpy on a Windows 7.0 PC, contact Technical Support.

  • Page 24: Use Serialspy To Capture Link Messages

    3. From the Communications Port list, click the comm port to match that for the COMM 4 USB Adapter. 4. From the Baud Rate list, choose the baud rate for the MS/TP link. Trane devices have a default baud rate of 76800. Ensure that you choose the rate used by the controllers or you will not obtain a quality screen capture.
  • Page 25 “Statistics Summary,” p. 38 for details on how this button is used. Port button — Refer to • “Trane SerialSpy Protocol Analyzer Software,” p. 23 for details on how this button is used. • Log button — The Log button allows you to continuously save a capture to a specified file location.

  • Page 26: Tracer ® Sc+ Bacnet ® Capture Help File

    Trane SerialSpy Protocol Analyzer Software ® ® Tracer SC+ BACnet Capture Help File ® ® Capture Tool can be found under Tools > BACnet Information. Use the drop-down menu The BACnet ® to select BACnet Capture Status. ® Figure 14. BACnet information This page will show the status of the last capture.

  • Page 27: Creating A New Bacnet ® Capture

    Trane SerialSpy Protocol Analyzer Software ® Figure 15. BACnet capture status ® Creating a New BACnet Capture To create a new capture click Create Capture, which opens the create dialog box. Capture Title: Provide a name for the capture. Capture Link: ®...
  • Page 28 Trane SerialSpy Protocol Analyzer Software Figure 16. Create capture Note: Once the capture has been created, you cannot create another capture until the current capture completes the activity. Stop Capture: While capture is running, you can stop the capture by clicking Stop Capture. Once stopped, the capture status is Finished and Create Capture will display.
  • Page 29 Trane SerialSpy Protocol Analyzer Software Cancel Scheduled Capture/ Edit Scheduled Capture: You can cancel the scheduled capture by clicking Cancel Scheduled Capture. Once canceled, the capture status will be Idle and Create Capture will be displayed. You can also edit a scheduled capture by clicking Edit Schedule Capture, which opens the edit dialog box (same as create).

  • Page 30: Total Communication Failure

    Figure 20. Typical SerialSpy output when connected to a link with a short circuit, short to ground, or reversed polarity Once you know there is a physical problem with the link, you can use two tools to help locate the problem: • A voltmeter measuring dc volts • The link LEDs on the Trane devices BAS-SVX51L-EN...
  • Page 31 Trane SerialSpy Protocol Analyzer Software You can use the “Troubleshooting Technique (Isolation),” p. 40 to narrow the search for a bad segment of wire. Table 8, p. 41 shows some particular characteristics that will identify specific faults. BAS-SVX51L-EN...

  • Page 32: Partial Communication Failure

    ® Figure 21, p. 32 shows an example of a capture with a single Trane BACnet device on the link. You can see that even with only one device on the link, the device will eventually start polling and try to find other devices on the link.
  • Page 33 38 and so on. Polling results in an unnecessary additional message on the link, which will reduce performance. For this reason, Trane recommends that addresses be set up sequentially when possible. Note: Once the device has polled the last address in the gap, it will stop polling for new devices for the next 50 token cycles.
  • Page 34 Trane SerialSpy Protocol Analyzer Software Data Request Details Serial Spy captures are most useful for determining which addresses are communicating and if there are specific patterns of diagnostics. So for the most part, that is what you will be looking for when you evaluate a SerialSpy capture.
  • Page 35 Trane SerialSpy Protocol Analyzer Software Duplicate Addresses A common problem is two devices on the network set to the same rotary switch address. At first glance, the SerialSpy capture appears populated blue diagnostics (see Figure 18, p. 29). However, one particular message repeats, “Retry of Token from 40 to 41”.
  • Page 36 Trane SerialSpy Protocol Analyzer Software Figure 25. Same capture with “Show diagnostics only” selected BAS-SVX51L-EN...
  • Page 37 Trane SerialSpy Protocol Analyzer Software Power Polarity Reversal ® Many jobs have a single transformer powering multiple Tracer UC400s. Strict polarity of the power wiring from the transformer to the Tracer UC400s must be observed in these cases. It is very easy to inadvertently ®...
  • Page 38 Trane SerialSpy Protocol Analyzer Software Statistics Summary There are two ways to view and gather statistics.The first is to use the Statistics button, which is useful for tracking stats during a live capture session. The second is to use the Stop button, which will append the statistics to the end of the captured file.

  • Page 39: Troubleshooting Options

    • Loose terminals. ® • Device not configured for BACnet communications. • Rotary dial error (address set to “0” with dials). • Trane rotary dial value set to zero. • Max Manager property set to low. • Device powered down. ® Tracer SC+ cannot install devices above 60 devices •...

  • Page 40: Troubleshooting Technique (Isolation)

    Troubleshooting Options Troubleshooting Technique (Isolation) Physical problems require some trial and error monitoring at various points on the link to isolate the location of the problem. Use this procedure, your volt meter, and Table 8, p. 41 to help you find the problem.
  • Page 41 Condition LEDs Serial Spy Normal Normal Normal Normal ® Two powered Trane BACnet terminators Min = 0.33 Tx = quick flash Clean token pass Max = 0.60 No (or few) blue diagnostics or errors Rx = almost solid on Avg = 0.45 (refer to Note Min = 0.35...
  • Page 42 Troubleshooting Options ® Table 8. Characteristics associated with specific problems on the BACnet MS/TP link (continued) Condition LEDs Serial Spy Min = 0.59 Tx = off Max = 0.61 Rx = solid on Plug comm link into IMC Junk during idle only. No other diagnostics Avg = 0.59 (voltage range is very flat) Normal...
  • Page 43 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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