1. BACNET MS/TP Topics: 1 – Network Requirements 2 – Device Addressing
9/10/2018
BACNET MS/TP
Topics:
1 – Network Requirements
2 – Device Addressing
3 – Power Supply Requirements
4 – System Architecture
5 – BACnet Objects & Services
6 – Labwork
Distech Controls, Inc.

2. BACnet MS/TP CONTINUE 1 – Network Requirements
9/10/2018
BACnet MS/TP
EST: 45:00
1 – Network Requirements
5 – BACnet Objects & Services
2 – Device Addressing
6 – Labwork
3 – Power Supply Requirements
7 – Project Conversion
4 – System Architecture
8 – Troubleshooting Issues
When you’ve completed this presentation on EC-gfxProgram Basics, click on the “QUIZ” button below to take a short quiz Then click the brown “NEXT MODULE” arrow below to advance to the next e-module – Module X: Module Name.
CONTINUE
Click to review Instructions >
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3. NETWORK REQUIREMENTS Topic 1
9/10/2018
Topology
Wiring
Device Load
Baud Rate
CHAPTER 2
BACNET MS/TP
NETWORK REQUIREMENTS Topic 1
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4. BACnet Integration in EC-Net-AX
Distech Controls
9/10/2018
BACnet Integration in EC-Net-AX
BACnet network design review
Topology and wiring
Addressing
Power supply
Commission an EC-BOS review
BCP BACnet Network driver
BACnet MS/TP Communication Port
Device MS/TP MAC addressing
Discovering devices
Device Instance number (ID) strategy
PC connection with BACnet IP to MS/TP adaptor
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Course 2003: Configurable Controllers 7

5. MS/TP Network Topology
9/10/2018
MS/TP Network Topology
BACnet MS/TP Network Topology
4,000 ft / 50 devices
(Recommended)
Data Transmission Protocol
MS/TP (RS-485)
Architecture Type
Daisy Chain
Number of device per segment
255 max (128 masters slaves)
50 recommended
Network Length
1220 meters (4000 ft) max
The Diagram depicts the typical BACnet MS/TP LAN Topology, showing How Devices are Daisy-
Chained Together for a single Data Bus Segment
Only linear, daisy-chained devices provide predictable data bus impedances
required for reliable data bus operation.
Only a daisy-chained data bus topology should be specified during the planning
stages of a project and implemented in the installation phase of the project.
A spur is only permitted when it is connected to the bus through a repeater (which will be shown later on)
Star and ring topologies are in no way supported because signal reflections on the data bus.
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6. MS/TP Network Wiring 9/10/2018 Cable Type
Shielded twisted pair (STP) (DC approved #07CBL-BACnet)
Wiring
Data Bus is Polarity Sensitive
Shield wire is continue on the entire length
Connect shield wire to building ground on one end only
End-Of-Line
120 Ohms resistor on each end of the segment
- Jumper on ECB Controllers
- External resistor on EC-BOS and ECB-Stat
Bias
510 Ohms per wire
Minimum of one, maximum of two sets per segment
Provided by built-in EOL (internal jumper EOL)
BACnet MS/TP Network Wiring
Looking at MSTP wiring, Cables composed of stranded conductors are preferred over solid conductors as stranded
conductor cable better resist breakage during pulling operations.
The Distech Controls BACnet cable offers the best performance over the full range of baud
rates, cable lengths, and number of connected devices. This is primarily due to lower
conductor-to-conductor capacitance of this cable.
Current surges from common electrical equipment (at start up / shut down) can induce noise
onto BACnet MS/TP data bus segment through electromagnetic coupling.
The best protection against interference is to use properly grounded shielded cable for the
MSTP segments.
The cable shields should be twisted together and isolated with electrical tape at each device.
The shield on each segment must be connected to electrical system ground at one point only, usually at the
Supervisory or Building Controller if there is one. On data bus segments
without a Supervisory or Building Controller, the ideal point to ground the shield is in the
middle of the data bus segment.
The first and last device on the data bus must have End-of-Line (EOL) termination resistors
connected across the two data lines/wires of the twisted pair.
1. EOL terminations dampen reflections on the bus that result from fast-switching (high-
speed rising and falling data edges).
EOL terminations should only be enabled / installed on the two devices located at either end
of the data bus. All other devices must not have the EOL terminations enabled/installed.
Devices are factory-set with the EOL termination disabled by default.
Please note that The BACnet MS/TP data bus must be biased.
This bias can only be provided by the built-in EOL termination resistors.
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7. 9/10/2018
MS/TP Network Load
All Distech Controls’ devices are categorized as Masters and rated as ⅛ load
Other may have different network load ratings (for example, ¼, ½, or full load)
If a segment contains dissimilar device load ratings, the device with the highest load rating is the one that sets the limit for the maximum number of devices for that data bus segment
For example, you plan to put the following devices on one data bus segment:
The solution for the above example is to create two data bus segments connected together by a repeater and then split up the devices between the data bus segments.
The BACnet MS/TP data bus supports up to 255 devices:
Up to 128 (0 to 127) devices that are Masters (that can initiate communication).
Up to 128 (128 to 255) devices that are Slaves (cannot initiate communication).
However, it is recommended that any given data bus segment have no more than 50
devices.
Please note that a repeater counts as a device on each data bus segment to which it is connected.
All Distech Controls’ devices are categorized as BACnet MS/TP Masters and are rated as ⅛
load devices.
However, if a data bus segment with Distech Controls Devices are interoperating with one or
more devices from another manufacturer that support fewer devices on a data bus segment
(for example, they are ¼, ½, or full load devices), then the device that supports the fewest
devices on the same data bus is the one that sets the limit for the maximum number of
devices for that data bus segment.
The solution for maintaining the 1/8 loading advantage of the ECB controllers is to create two data bus segments connected together
by a repeater and then split up the devices between the data bus segments, ensuring again
that the maximum number of devices on each separate data bus is not exceeded.
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8. MS/TP Network Baud Rate
9/10/2018
MS/TP Network Baud Rate
By default, the Distech BACnet controllers have their BAUD rate set to AUTO
The recommended baud rate for Distech Controls’ devices is 38.4 kbps
All devices on the data bus must be set to the same baud rate
Therefore, the chosen baud rate must be supported by all devices connected to the data bus
Most devices will have a settings AUTO. This is the preferred setting for a controller. However, at least one controller on the BACnet MS/TP network data bus must have its BAUD rate set. The preference is to set the building controller’s BAUD rate (if present). e.g. on an EC-BOS.
Most devices will have a range of baud rate settings and possibly an AUTO setting that
detects the baud rate of other devices transmitting on the data bus allowing them to adjust the baud rate
of the device accordingly. Typical baud rates are 9.6, 19.2, 38.4, and 76.8 kbps. The
baud rate setting determines the rate at which data is sent on the data bus. All devices on
the data bus must be set to the same baud rate. Therefore, the chosen baud rate must be
supported by all devices connected to the data bus.
Distech Controls’ devices must be power cycled after changing a baud rate setting for it to
take effect.
The recommended baud rate for Distech Controls’ devices is 38.4 kbps.
Baud Rate
Support: from 9.6 to 76.8 kbps
Recommended: 38.4 kbps
Default setting on ECB controllers: AUTO
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9. MS/TP Network Baud Rate
9/10/2018
MS/TP Network Baud Rate
When the Baud rate is set to AUTO, the controller cannot initiate any communication until it has detected the baud rate of the BACnet MS/TP network
If all controllers on the BACnet MS/TP network are set to AUTO, then all controllers will not communicate
Setting the BAUD rate on at least one controller is required, which will set the BAUD rate for all other controllers on the data bus
Setting the BAUD rate on ECB controllers is performed with the EC-Smart-Vue General Configuration Menu (See Hardware Installation Guide)
By default, the BAUD rate for the controller is set to automatically detect the current
communication BAUD rate of the connected BACnet MS/TP network.This is the
preferred setting for a controller. However, at least one controller on the BACnet MS/TP
network data bus must have its BAUD rate set. The preference is to set the building
controller’s BAUD rate (if present). Otherwise, set the BAUD rate on one controller that will
set the BAUD rate for all other controllers.
When the Baud rate is set to AUTO, the controller cannot initiate any
communication until it has detected the baud rate of the BACnet MS/TP network.
If all controllers on the BACnet MS/TP network are set to AUTO, then all
controllers will not communicate.
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10. DEVICE ADDRESSING Topic 2
9/10/2018
BACNET MS/TP
DEVICE ADDRESSING Topic 2
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11. Device Addressing / Best Practices
9/10/2018
Device Addressing / Best Practices
Device Addressing Overview
Device MAC Addressing
Bus Master Device Settings
Device Instance (ID) Number
Device Numbering System
Now we will review the best practices for Device Addressing as well as recommendations for MS/TP Device MAC Addresses, configuration of the MS/TP Bus Master Device, configuration of the BACnet Device Instance Number and an overview of a
Numbering System Example scenario.
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12. Device Addressing Overview
9/10/2018
Device Addressing Overview
Each device connected to the BACnet MS/TP data bus is identified by a:
MAC address
Device Instance number
Network number
The MS/TP Device MAC Address uniquely identifies a device on an MS/TP Network segment (identified by a Network Number). Devices on another MS/TP Network segment (identified by a different Network Number) can have the same MAC Address. The MAC Address is any number between 0 and 127 for Master devices, and 128 to 254 for Slave devices.
Address 255 is a wild card for broadcasts.
Device addressing allows the coordinated transfer of messages between the intended
devices on the BACnet MS/TP data bus and with devices connected to the internetwork. For
this, each device connected to the BACnet MS/TP data bus is identified by a MAC address,
a Device Instance number, and a Network Number:
The MAC Address uniquely identifies a device on a Network. For Master Controllers like the ECB Series, the number ranges between
Devices on another Network can have the same MAC Address as messages
are not passed at the internetwork level using the MAC Address.
The Device Instance uniquely identifies a device across the BACnet internetwork. The
Device Instance is any number between 0 and It is with the Device Instance
that messages are exchanged between BACnet devices.
Unlike a MAC Address, a Device Instance cannot be reused elsewhere in the BACnet
Internetwork .
The Network Number is any number between 1 and A network number identifies
a LAN for routing purposes.
Both the MAC Address and the Device Instance must be set for each device and are
essential for proper BACnet LAN operation.
Addressing
Both the MAC Address and the Device Instance must be set for each device and are essential for proper BACnet LAN operation
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13. Device Addressing Overview
9/10/2018
Device Addressing Overview
The BACnet Device Instance (or Device ID) uniquely identifies a device across the complete BACnet internetwork. The Device Instance may be any number between 0 and It is with the Device Instance that messages are exchanged between BACnet devices.
Unlike a MAC Address, a Device Instance cannot be reused elsewhere in the BACnet internetwork (it must be unique).
The BACnet Network Number is any number between 1 and A network number identifies a LAN for routing purposes. Each BACnet MS/TP Network will have a Network Number, and each BACnet IP Network will also have a Network Number.
Device addressing allows the coordinated transfer of messages between the intended
devices on the BACnet MS/TP data bus and with devices connected to the internetwork. For
this, each device connected to the BACnet MS/TP data bus is identified by a MAC address,
a Device Instance number, and a Network Number:
The MAC Address uniquely identifies a device on a Network. For Master Controllers like the ECB Series, the number ranges between
Devices on another Network can have the same MAC Address as messages
are not passed at the internetwork level using the MAC Address.
The Device Instance uniquely identifies a device across the BACnet internetwork. The
Device Instance is any number between 0 and It is with the Device Instance
that messages are exchanged between BACnet devices.
Unlike a MAC Address, a Device Instance cannot be reused elsewhere in the BACnet
Internetwork .
The Network Number is any number between 1 and A network number identifies
a LAN for routing purposes.
Both the MAC Address and the Device Instance must be set for each device and are
essential for proper BACnet LAN operation.
Addressing
Both the MAC Address and the Device Instance must be set for each device and are essential for proper BACnet LAN operation
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14. MS/TP Device MAC Address
9/10/2018
MS/TP Device MAC Address
Reserve some MAC Addresses for common commissioning and maintenance tasks.
Reserve MAC 0 for the Building Controller MS/TP port
Reserve MAC 1 for a portable router, so it can be temporarily connected without conflicting with other devices already connected to the data bus.
Avoid gaps in the MAC address sequence.
The physical order is unimportant.
MAC Addresses should be used as shown in the following table.
While the MAC Address is a number from 0 to 255, we recommend reserving some MAC
Addresses for common commissioning and maintenance tasks.
For example, when a portable router is set to use one of these reserved MAC Addresses, it can be temporarily
connected with certainty to any data bus of any site without conflicting with other devices
already connected to the data bus.
The MAC address 0 should be used for the EC-BOS, 1 should be used for a IP/MSTP adaptor connetion, and should be used for the ECB devices.
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15. Setting MS/TP Device MAC Address
9/10/2018
Setting MS/TP Device MAC Address
ECB devices:
The MAC address can be changed using EC-Smart-Vue (all DIP switches need to be at 0 position)
The MAC address can also be changed using DIP switches on ECB-203 and higher series (device power cycle is required after)
ECB-STAT: On the LCD interface menu
EC-BOS: Using EC-NetAX Pro, MstpPort / Link Properties
Ex. MAC: = 82
The MAC address can be changed by either using the EC-SmartVUE or by using the DIP switches on the phsyical controller.
The MAC of the ECB-STAT series can be modified on the LCD interface, and the EC-BOS can be set via the EC-NET AX Pro software.
Tool Kit
All technicians should have an EC-Smart-Vue in their tool kit
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16. MS/TP Bus Master – Device Settings
9/10/2018
MS/TP Bus Master – Device Settings
In a typical BACnet Network, the Network interface card used to access the MS/TP bus is called the Bus Master. In recommended architectures, the EC-BOS MS/TP Port is the Bus Master Device.
There are 4 configurations that are required on the Bus Master Device:
Baud Rate
MS/TP Address (MAC Address)
Max Master
Max Info Frames
In a typical BACnet Network, the Network interface card used to access the MS/TP bus is called the Bus Master. In recommended architectures, the EC-BOS MS/TP Port is the Bus Master Device. There are 4 configurations that are required on the Bus Master Device:
Baud Rate
MS/TP Address (MAC Address)
Max Master
Max Info Frames
The Baud Rate is usually set in the Bus Master (EC-BOS) and it will be the only reference if all devices on the network are set to AUTO.
The MS/TP Address or MAC Address for the Bus Master (EC-BOS) should be 0 (it’s the default value)
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17. MS/TP Bus Master – Baud Rate & MAC
9/10/2018
MS/TP Bus Master – Baud Rate & MAC
The Baud Rate
Usually set in the Bus Master (EC-BOS) and will be the only reference if all devices on the network are set to AUTO. All devices on the network need to have the same Baud rate manually set or AUTO
38.4 kbps is the recommended Baud rate setting in the EC-BOS
AUTO is the default and recommended setting for all ECB controllers
The MS/TP Address
Or MAC Address for the Bus Master (EC-BOS) is set to 0 (it’s the default value)
In a typical BACnet Network, the Network interface card used to access the MS/TP bus is called the Bus Master. In recommended architectures, the EC-BOS MS/TP Port is the Bus Master Device. There are 4 configurations that are required on the Bus Master Device:
Baud Rate
MS/TP Address (MAC Address)
Max Master
Max Info Frames
The Baud Rate is usually set in the Bus Master (EC-BOS) and it will be the only reference if all devices on the network are set to AUTO.
The MS/TP Address or MAC Address for the Bus Master (EC-BOS) should be 0 (it’s the default value)
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18. MS/TP Bus Master – Max Master
9/10/2018
MS/TP Bus Master – Max Master
MS/TP Network: Bus Master Device (Building Controller)
To prevent the passing of the token to unused MAC Addresses situated after the final Master device, the Max Master must be set in each Master Device.
About the Max Master Property
By default, the Max Master for the MS/TP Bus is set to 127 in the EC-BOS
In practice, the actual number of devices connected to a data bus is far less. This gap unnecessarily slows-down the data bus.
Set the Max Master in the EC-BOS to the highest Master device’s MAC Address to optimize the efficiency of the data bus (reserve 3 to 5 more for spares)
To prevent the passing of the token to unused MAC Addresses situated after the final Master
device, the Max Master property must be set. By default, the Max Master for the Bus Master
(Building Controller) is set to 127 which allows for the theoretical maximum of 127 devices
besides the Bus Master to be connected to the data bus.
In practice, the actual number of devices connected to a data bus is far less, resulting in a
gap between the highest MAC Address of any device connected to the data bus and the
value set for Max Master. This gap unnecessarily slows-down the data bus with Poll for
Master requests.
When commissioning a BACnet MS/TP Data Bus, it is useful to start with the Max Master set
to 127 so as to be able to discover all devices connected to the data bus. Then, once all
devices have been discovered and the MAC Addressing is finalized by eliminating any gaps
in the address range, set the Max Master in the EC-BOS to the highest Master device’s MAC Address number to optimize the
efficiency of the data bus.
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19. MS/TP Bus Master – Max Info Frames
9/10/2018
MS/TP Bus Master – Max Info Frames
MS/TP Network: Bus Master Device (Building Controller)
Max Info Frames is set to 20 (default) in the EC-BOS – may be increased as needed
Once a device has the token, it can make a number of information requests to other devices on the BACnet internetwork. The maximum number of requests is limited by the Max Info Frames property.
Ordinary BACnet MS/TP devices should have the Max Info Frames properties set to between 1 and 5. The Bus Master (EC-BOS) should have the Max Info Frames property set to about 20.
Once a device has the token, it can make a number of information requests to other devices on the BACnet intranetwork.
The maximum number of requests is limited by the Max Info Frames parameter.
Ordinary BACnet MS/TP devices should have the Max Info Frames parameter set to between 2 and 4. The Bus Master (Building Controller) should have the Max Info Frames parameter set to 20.
Device Type
Info Frames
Reason
ECB-STAT 1
Thermostats
ECB-VAV series 5
Terminal units controllers don’t have many requests
ECB-203 (and above)
System unit controllers have more requests
EC-BOS 20
Building Controllers have most requests
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20. BACnet Device Instance Number (ID)
9/10/2018
BACnet Device Instance Number (ID)
Default Numbering System for Distech Controls’ controllers
By default, controllers from Distech Controls automatically self-assign a Device Instance number generated from the MAC Address assigned to the controller during installation.
The Device Instance number is calculated as follows, where 364 is Distech Controls BACnet manufacturer ID:
Default Device Instance number = 364 X MAC Address
This Numbering system is sufficient for a BACnet network that has only one MS/TP Network on only one Building Controller (EC-BOS).
Examples:
By default, controllers from Distech Controls automatically self assign a Device Instance number generated from the MAC Address assigned to the controller during installation.
The Device Instance number is calculated as follows, where 364 is Distech Controls BACnet manufacturer ID:
Device Instance number = 364 X MAC Address
This Numbering system is sufficient for a BACnet network that has only one MS/TP Network on only one Building Controller (EC-BOS).
For larger BACnet networks that have more than one Building Controller, set the MAC Addresses, Device Instance Numbers and Network Numbers manually according to pre-devised numbering scheme.
MAC Address
Default Numbering System
Default Device Instance Number 3
364003 20
364020
123
364123
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21. BACnet Device Instance Number For Larger BACnet Networks
For larger BACnet networks that have more than one building controller, set the MAC addresses, Device Instance numbers and Network numbers manually according to a good well thought-out network planning scheme.
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22. Device Instance Numbering System
9/10/2018
Device Instance Numbering System
Numbering System for MAC Addresses, Device Instance and Network Numbers
Distech recommends the following scheme, as it reuses the MAC Address and Network Number in the Device Instance number to make it easier to implement:
Good network planning requires a well thought-out numbering scheme for device MAC Addresses, Device Instance Numbers (DI), and Network Numbers.
We recommend the following scheme, as it reuses the MAC Address and Network Number in the Device Instance number to make it easier for a network administrator to know where a device is located in the network.
When discovering devices with an EC-BOS which has the routing option
configured, it will discover all BACnet devices connected to all EC-BOSes. Make
sure to add only the devices connected to the MS/TP port of the specific EC-BOS
being configured. Using this numbering system will greatly help to identify those
devices that should be added to a given EC-BOS.
Discover
Make sure to add only the devices connected to the MS/TP port of the specific EC-BOS being configured. Using this numbering system will greatly help to identify those devices that should be added to a given EC-BOS.
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23. Device Instance Numbering System Example
9/10/2018
Device Instance Numbering System Example
As you can see in the example, the IP network number is in the range of 1 –
The building controller Device instance number is in the multiples of
The MSTP network numbers are in the range from 10 to 4190
The MAC addresses are unique in each MSTP segment and are re-used in others.
The final controller device instance numbers are in the range from to as they are defined as the MSTP network number, multiplied by the MAC address.
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24. POWER SUPPLY REQUIREMENTS Topic 3
9/10/2018
BACNET MS/TP
POWER SUPPLY REQUIREMENTS Topic 3
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25. Power Supply Requirements
9/10/2018
Power Supply Requirements
Power Supply Wiring
Power Supply Ground Lift
Typical Wiring Diagram
In the following section of the presentation, we will now discuss the requirements as it pertains to power supply wiring, considerations for power supply ground lifting and review a typical wiring diagram.
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26. Power Supply Wiring 24V Power Supply wiring
9/10/2018
Power Supply Wiring
24V Power Supply wiring
The 24V COM terminal of all devices must be connected to the Electrical System Ground. Without this signal reference, transceivers may interpret the voltage levels of the differential data signals incorrectly, and this may result in data transmission errors.
All Distech devices use the 24V COM terminal as the signal reference point for the data bus. That wire must be connected to the Electrical System Ground at the power supply. This ensures that the 24V COM terminals of all devices in the building are at the same potential
Mechanical ground is unacceptable: Do not use a pipe, conduit or duct work for a ground
For inter-building connections, it is recommended to use a BACnet/IP or Fox network connection.
BACnet MS/TP is a Three Wire Bus. Even though data is transmitted over a 2-wire twisted pair, all EIA-485 transceivers interpret
the voltage levels of the differential signals with respect to a third voltage reference common
to all devices connected to the data bus (signal reference).
All Distech Controls devices use the 24V COM terminal as the signal reference point for the
data bus. As a consequence, you must wire the power supply (for any given number of devices), such that the power bus that is connected to the 24V COM terminal is also connected to the building’s ground at the power supply. This ensures that the 24V COM terminals of all devices connected to any BACnet MS/TP bus in the building are at the same potential.
As specified by electrical safety codes worldwide, the building’s protective ground
network must not be used to conduct electrical current under normal conditions.
Such current can lift the reference voltage sensed at a controller’s 24V COM
terminal, thus resulting in data transmission errors.
A mechanical ground is unacceptable: Do not use a pipe, conduit, or duct work for
a ground. The power supply must have a dedicated ground wire that comes from
the main electrical supply panel.
Any connection between buildings cannot be made with BACnet MS/TP. For
inter-building connections, it is recommended to use a BACnet/IP or Fox protocol network
connection.
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27. Power Supply Ground Lift
9/10/2018
Power Supply Ground Lift
Avoid Ground Lift
Ground lift is caused by wire resistance causing voltage drop on the power wire run.
Because the 24V COM terminal is the signal reference point for the data bus, a ground lift would offsets that reference and affect the transceiver’s valid data levels.
If the ground lift (voltage drop) is more than 7 volts, there is a risk of data corruption and offline events due to the device being incapable of correctly reading data signals.
Power wiring runs should not be too long, nor have too many devices connected to it. Wiring
used to supply power to devices has a resistance that is proportional to the length of the
wiring run. If the power run from the power supply is relatively long and it supplies power to many
devices, a voltage will develop over the length of wire. This effect is called ground lift.
Because the 24V COM terminal is the signal reference point for the data bus, ground lift
offsets the data bus voltage reference that is used to interpret valid data levels sent on the
data bus. If the ground lift is more than 7 volts peak, there is a risk of data corruption and
offline events due to the device being incapable of correctly reading data signals from the
data bus.
Reduce the impact of ground lift by:
Using a heavier gauge wire.
Adding more wire runs from the power supply
Or Specify a 24 DC power supply.
Distech Controls’ devices are Class 2 Products. To conform to Class 2 installation
requirements, only use transformers of 100VA or less to power the device(s).
For VAV devices, determine the maximum number of VAVs that can be supplied by a single
power run cable supplied by a 100 VA transformer, according to the cable’s wire gauge and
the total cable length based on the information presented in the hardware installation guide.
Any installation conditions outside of the parameters specified in the hardware installation guide should be avoided.
For non-VAV devices, determine the appropriate size transformer for the job as follows:
Add up the power requirements of all devices plus all connected output loads. Multiply
the total power needed by a multiplier of 1.3, as a security margin.
When the total load of a number of devices requires a transformer with a rating greater
than 100 VA, use two or more transformers.
Always use a separate transformer for each ECB-600 and its associated
Extension I/O Modules.
Use an external fuse on the 24VAC side (secondary side) of the transformer, as shown in, to protect all controllers against power line spikes.
Finally always remember to maintain consistent polarity when connecting controllers and devices to the transformer.
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28. Power Supply Ground Lift
9/10/2018
Power Supply Ground Lift
Techniques to Reduce Ground Lift
Power wiring runs should not be too long, nor have too many devices connected to it.
Use the instructions in the Hardware installation guide for limitations info.
Always use a transformer with 100VA power or less.
Power 5 devices or less with one 100VA transformer.
Use a wire with a gage of 18 or less for the power run.
When the total load of a number of device requires more than 100 VA, use two or more transformers.
Maintain consistent polarity when connecting controllers and peripherals to the power run.
The 24V COM terminal of the transformer must be connected to the building’s ground.
Power wiring runs should not be too long, nor have too many devices connected to it. Wiring
used to supply power to devices has a resistance that is proportional to the length of the
wiring run. If the power run from the power supply is relatively long and it supplies power to many
devices, a voltage will develop over the length of wire. This effect is called ground lift.
Because the 24V COM terminal is the signal reference point for the data bus, ground lift
offsets the data bus voltage reference that is used to interpret valid data levels sent on the
data bus. If the ground lift is more than 7 volts peak, there is a risk of data corruption and
offline events due to the device being incapable of correctly reading data signals from the
data bus.
Reduce the impact of ground lift by:
Using a heavier gauge wire.
Adding more wire runs from the power supply
Or Specify a 24 DC power supply.
Distech Controls’ devices are Class 2 Products. To conform to Class 2 installation
requirements, only use transformers of 100VA or less to power the device(s).
For VAV devices, determine the maximum number of VAVs that can be supplied by a single
power run cable supplied by a 100 VA transformer, according to the cable’s wire gauge and
the total cable length based on the information presented in the hardware installation guide.
Any installation conditions outside of the parameters specified in the hardware installation guide should be avoided.
For non-VAV devices, determine the appropriate size transformer for the job as follows:
Add up the power requirements of all devices plus all connected output loads. Multiply
the total power needed by a multiplier of 1.3, as a security margin.
When the total load of a number of devices requires a transformer with a rating greater
than 100 VA, use two or more transformers.
Always use a separate transformer for each ECB-600 and its associated
Extension I/O Modules.
Use an external fuse on the 24VAC side (secondary side) of the transformer, as shown in, to protect all controllers against power line spikes.
Finally always remember to maintain consistent polarity when connecting controllers and devices to the transformer.
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29. SYSTEM ARCHITECTURE Topic 4
9/10/2018
BACNET MS/TP
SYSTEM ARCHITECTURE Topic 4
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30. Typical Wiring Diagram
9/10/2018
Typical Wiring Diagram
Device BACnet MS/TP LAN and Power Wiring Diagram
This is an example of a typical wiring diagram.
Note that the polarity is respected for the connection to each device, and the 24VAC COM is grounded to earth ground.
For further details, please see the hardware installation guide for each respective controller type.
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31. Medium-to-Large Building Architecture
9/10/2018
Medium-to-Large Building Architecture
In this example of a medium sized building architecture, two EC-BOS controllers are used with multiple segments originating from a single EC-BOS. It is ideal to use multiple segments, especially for isolating 3rd party devices to a particular segment in order to maintain the higher speed and device limit capabilities on the other segments.
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32. Peer-to-Peer Architecture
9/10/2018
Peer-to-Peer Architecture
True Peer-to-Peer
Typical architecture for very small projects
No building controller required
Any device is able to Initiate data transfer
Data sharing from one to many
Local network connection required for engineering
This is an example of a typical peer to peer architecture.
All of our controllers act as Masters and thus true peer to peer communication is achieved.
Furthermore, a technician can easily connect to the network via the Adaptor and the communication port on the EC-SmartVUE.
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33. BACnet IP to MS/TP Network Adaptor
9/10/2018
BACnet IP to MS/TP Network Adaptor
Used to connect a computer (typically a laptop) to a BACnet MS/TP network
Internal Web server for configurations and diagnostics
Optically isolated MS/TP port
Supplied by a USB port (USB port is strictly used to power the unit)
3.5mm Stereo jack quick connect to MS/TP bus
Applications
Commissioning
Configuring
Engineering
Troubleshooting
The BACnet/IP to MS/TP Adapter is a multi-network adapter, sharing messages among BACnet/IP,
BACnet Ethernet and MS/TP networks. The adapter is configurable via its internal webpage, and can be powered via the USB port of your computer. It has one isolated MS/TP port and one 10/100 Mbps Ethernet
The USB port is strictly used to power the BACnet/IP to MS/TP Adapter. No communications is
supported via the USB port.
The BACnet/IP to MS/TP Adapter features a user-accessible switch to reset the IP address, subnet mask and
gateway address to the factory defaults.
Adaptor
Use the adaptor in Peer-to-Peer architectures
Also when no IP connection to the BAS is accessible
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34. BACNET OBJECTS & SERVICES Topic 5
9/10/2018
BACNET MS/TP
BACNET OBJECTS & SERVICES Topic 5
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35. BACnet Specific Objects
Distech Controls
9/10/2018
BACnet Specific Objects
BACnet Objects
Inputs
Outputs
Values
PID
Schedule
Calendar
Commandable objects usage
Non-commandable objects usage
BACnet Network properties
Alarm properties (B-AAC)
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Course 2003: Configurable Controllers 38

36. BACnet Specific Services
Distech Controls
9/10/2018
BACnet Specific Services
Read Property Services
COV Subscription Services
Receive Broadcast COV
Write Property Services
Send Broadcast COV Services
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Course 2003: Configurable Controllers 39

37. LABWORK Topic 6 LAB 11: Getting Started With BACnet MS/TP BACnet MS/TP
9/10/2018
LAB 11: Getting Started With BACnet MS/TP
BACnet MS/TP
LABWORK Topic 6
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38. Lab 11: Starting With BACnet MS/TP
LAB 11 – 75 min
Getting Started With BACnet MS/TP Controllers
40:00
Ideal for large control requirements, ranging from 28-points to 76-points (HW inputs/outputs) (support up two ECx-400 extension modules)
Fast-response 32-bit microprocessor for complex data processing, including floating point support and math function execution, such as trigonometric and psychometric calculations
Supports up to 500 network values
ECB-600/610/650
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39. Lab 11: Starting With BACnet MS/TP
Add BACnet Network
Configure the Local Device (EC-BOS)
Add & Configure MS/TP Port
Set MAC Addresses for BACnet Devices
Discover & Add Devices
Configure Device IDs for all Devices
Configure Max Master
Launch EC-gfxProgram / Load a Project
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40. Lab 11: Starting With BACnet MS/TP
LAB 11A – 3 min
Create a BcpBacnetNetwork on the EC-BOS station
LAB 11B – 2 min
Configure the Local Device (EC-BOS)
LAB 11C – 10 min
Add & Configure the MSTP Port
LAB 11D – 10 min
Set MAC Address for all BACnet devices
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41. Lab 12: Starting With BACnet MS/TP
LAB 11E – 3 min
Discover & Add BACnet devices
LAB 11F – 5 min
Configure Device IDs for all BACnet devices
LAB 11G – 2 min
Configure the Max Master property and communicate to all devices on the BACnet network
LAB 11H – 5 min
Launch EC-gfxProgram and Load a project
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42. Lab 12: Starting With BACnet MS/TP
LAB 12A – 3 min
Add a BcpBacnetNetwork on the EC-BOS Station
From the Distech Controls palette, add the BcpBacnetNetwork driver to your station. Or use the New button in the Driver Manager.
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43. Lab 11: A – Add a BACnet Network
Add the BcpBacnetNetwork driver to the Drivers container of your EC-BOS station.
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44. Lab 11: A – Add a BACnet Network
Add the BcpBacnetNetwork driver to the Drivers container of your EC-BOS station. 2 1 3 4
Driver Manager
New button 2
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45. Lab 11: Starting With BACnet MS/TP
LAB 11B – 2 min
Configure the Local Device (EC-BOS)
On the Local Device’s property sheet, set the Object ID property to a value other than the default of -1.
For the Lab exercise, we will use the last 2 digits of the EC-BOS IP address plus “000” to designate the EC-BOS as the master controller.
EXAMPLE:
13 = last 2 digits of BOS IP ( )
000 = MAC address of EC-BOS
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46. Lab 11: B – Configure Local Device
Set the Object ID property to a value other than the default of -1.
Use the last 2 digits of the EC-BOS IP address plus “000” to designate the EC-BOS as the master controller.
EXAMPLE:
13 = last 2 digits of BOS IP ( )
000 = MAC address of EC-BOS
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47. Lab 11: B – Configure Local Device
Set the Object ID property to a value other than the default of -1.
Use the last 2 digits of the EC-BOS IP address plus “000” to designate the EC-BOS as the master controller.
EXAMPLE:
13 = last 2 digits of BOS IP ( )
000 = MAC address of EC-BOS
Local Device
Object ID
Property sheet
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48. Lab 11: Starting With BACnet MS/TP
LAB 11C – 10 min
Add & Configure the MSTP Port
From the distechControls palette, add an MSTP port to the BcpBacnetNetwork under BACnet Comm > Network.
Configure the following properties on the MSTP Port’s property sheet:
Port Name
Baud Rate
MS/TP Address (MAC)
Max Master
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49. Lab 11: C – Add/Configure MS/TP Port
From the distechControls palette, add an MSTP port to the BcpBacnetNetwork under BACnet Comm > Network.
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50. Lab 11: C – Add/Configure MS/TP Port
From the distechControls palette, add an MSTP port to the BcpBacnetNetwork under BACnet Comm > Network.
distechControls
MSTP Port
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51. Lab 11: C – Add/Configure MS/TP Port
Configure the following properties on the MSTP Port’s property sheet:
Network Number
Port Name
Baud Rate
MS/TP Address (MAC)
Enabled
Bacnet Comm > Network > MSTP Port
Property sheet
Set to TRUE
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52. Lab 11: C – Add/Configure MS/TP Port
Configure the following properties on the MSTP Port’s property sheet:
Network Number
Port Name
Baud Rate
MS/TP Address (MAC)
Enabled
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53. Lab 11: Starting With BACnet MS/TP
LAB 11D – 10 min
Set MAC Address / Baud Rate for all BACnet devices
Using one of the following methods, set the MAC address and BAUD rate for the BACnet controllers:
DIP switches
EC-Smart-Vue
LCD screen (x50 series)
Menu button (STAT only)
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54. Lab 11: D – Set Device MAC Addresses
Using one of the following methods, set the MAC address and BAUD rate for the BACnet controllers:
DIP switches
EC-Smart-Vue
LCD screen (x50 series)
Menu button (STAT only)
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55. Lab 11: D – Set Device MAC Addresses
The following options are available for setting the MAC address for a programmable BACnet device:
Click for more info:
DIP Switches
EC-Smart-Vue
X50 LCD Screen
STAT Menu
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56. Lab 11: Starting With BACnet MS/TP
LAB 11E – 3 min
Discover & Add BACnet devices
Discover the devices (physical controllers) on your BcpBacnetNetwork.
Add them to the BcpBacnetNetwork in the Database pane.
Rename the device as appropriate with the site’s device naming convention.
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57. Lab 11: E – Discover/Add BACnet Devices
Discover the devices (physical controllers) on your BcpBacnetNetwork.
Add them to the BcpBacnetNetwork in the Database pane.
Rename the device as appropriate with the site’s device naming convention.
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58. Lab 11: E – Discover/Add BACnet Devices
Discover Pane
Database Pane
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59. Lab 11: Starting With BACnet MS/TP
LAB 11F – 5 min
Configure Device IDs for all BACnet devices
Select the devices for which you wish to change the Device ID in the Database pane, and click the Change Device ID button.
Set the Device IDs for devices simultaneously for common changes or individually for changes unique to a specific device.
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60. Lab 11: F – Configure Device IDs
Select the devices for which you wish to change the Device ID in the Database pane, and click the Change Device ID button.
Set the Device IDs for devices simultaneously for common changes or individually for changes unique to a specific device.
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61. Lab 11: F – Configure Device IDs
Change Device ID
Database Pane 2 3 4 5
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62. Lab 11: Starting With BACnet MS/TP
LAB 11G – 2 min
Configure the Max Master property and communicate to all devices on the BACnet network
On the MSTP Port Link property sheet, use the MSTP Configuration tool to set the Max Master for all BACnet devices on the network.
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63. Lab 11: G – Configure the Max Master
On the MSTP Port Link property sheet, use the MSTP Configuration tool to set the Max Master for all BACnet devices on the network.
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64. Lab 11: G – Configure the Max Master2 3 4 1
Max Master
MS/TP Configuration tool
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65. Lab 11: Starting With BACnet MS/TP
LAB 11H – 5 min
Launch EC-gfxProgram and Load a project
Right-click on the Bacnet device and select Launch Wizard.
EC-gfxProgram will load under EC-Net-AX. Validate connectivity with both the EC-BOS and the BACnet controller.
Load a pre-loaded application project from the Code Library.
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66. Lab 11: H – Launch GFX and Load a Project
Right-click on the Bacnet device and select Launch Wizard.
EC-gfxProgram will load under EC-Net-AX. Validate connectivity with both the EC-BOS and the BACnet controller.
Load a pre-loaded application project from the Code Library.
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67. Lab 11: H – Launch GFX and Load a Project
Launch Wizard
EC-gfxProgram
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68. Lab 11: H – Launch GFX and Load a Project
Code Library
gfxApplications 2 3
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69. PROJECT CONVERSION Topic 7
9/10/2018
BACnet MS/TP
PROJECT CONVERSION Topic 7
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70. Project Conversion
To convert a project engineered in another protocol such as LonWorks, you must convert it to the current protocol – in this case, BACnet. Before conversion, the Error List will display many errors, such as below, because BACnet does not know how to interpret the other protocol’s objects.
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71. Project Conversion
To convert a pre-engineered project to another protocol, use the Convert Project button in the File menu. The resulting new list of errors should be significantly reduced. 2 1
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72. Project Conversion
In the case of converting from a Lon project, BACnet does not recognize Network Variables or SNVTs, and so each Network Variable must be replaced with a BACnet Network Value block:
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73. Project Conversion
Each Network Value block must be configured for the following properties:
Network Value Mode
Configuration Type
Service
Device Path
Object
Property
Data Type
Default Value
Poll Interval
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74. Project Conversion Property Value Network Value Mode
Input or Output
Configuration Type
Database or Manual
Service
For INPUTS:
Read Property
Read Property Multiple
COV Subscription
Receive Broadcast COV
For OUTPUTS:
Write Property
Write Property Multiple
Send Local Broadcast COV
Send Global Broadcast COV
Device Path
Select the device from a network tree
Object
Select the BACnet object from the device that is being received from (and read by) the controller
Select the BACnet object from the device that is being sent to (and written to) the other controller
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75. Project Conversion
The Project Conversion tool can save you both time and money in allowing you to reuse existing projects engineered in other protocols or devices.
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76. TROUBLESHOOTING ISSUES Topic 8
9/10/2018
CHAPTER 6
BACnet MS/TP
TROUBLESHOOTING ISSUES Topic 8
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77. Troubleshooting Issues
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78. Troubleshooting Issues - Fault Conditions
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79. Troubleshooting Issues - Status LED Interpretations
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80. Troubleshooting Issues - Before Calling Tech Support Verifications
Bus EOL termination
Duplicate MACs
Same Baud rate
Incorrect polarity
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81. Troubleshooting Issues - Before Calling Tech Support Verifications
COV reporting
MAC address gaps
Non Daisy-chained
Power: not > 5 devices
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82. GETTING STARTED WITH BACNET
9/10/2018
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GETTING STARTED WITH BACNET
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83. 9/10/2018
The QUIZ is still under development. So click again and we’ll take you to the next module.
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