Honeywell TB7200, TB7300 User Manual

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BACnet Integration Manual for TB7200 & TB7300 Series Thermostats

INTEGRATION MANUAL

More information

The additional following documentation is available on

http://customer.honeywell.com.

• TB7200 Series Installation Instructions (form number 622019).

• TB7300 Series Installation Instructions (form number 622018).

• PIR Application Guide for TB7200 and TB7300 Series Thermostats (form number 63-4526).

TB7200 Series	TB7300 Series
Thermostat	Thermostat with
	Occupancy Sensor

PRODUCT OVERVIEW

The TB7200 Series PI thermostats are designed for zoning applications, and the TB7300 Series PI thermostats are designed for fan coil control. Both Series are communicating thermostats with models available in BACnet® MS/TP and ZigBee® wireless mesh protocols and can be easily integrated into a WEBs-AX building automation system based on the NiagaraAX® platform.

TB7200 and TB7300 Series thermostats are compatible with the Honeywell Occupancy Sensor Cover. Thermostats equipped with an occupancy sensor cover provide advanced active occupancy logic, which will automatically switch occupancy levels from Occupied to Stand-By and Unoccupied as required by local activity being present or not. This advanced occupancy functionality provides advantageous energy savings during occupied hours without sacrificing occupant comfort. All thermostats can be ordered with or without a factory installed PIR cover.

	Contents
Product Overview .............................................................	1
Compatibility .....................................................................	2
Tips and Things You Need To Know .................................	2
Wiring Guidelines .............................................................	3
Network Configuration ......................................................	5
Network Adapter ...............................................................	8
Integration ........................................................................	9
Troubleshooting ................................................................	14
Appendix ..........................................................................	15
BACnet Objects Supported ..............................................	16

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

COMPATIBILITY

Honeywell TB7200 and TB7300 Series thermostat compatiblity information is provided in Table 1.

Table 1. TB7200 Series and TB7300 Series Thermostat Compatibility Information

WEBs-AX Controller	Thermostats Per Controller*	WEBStation-AX
WEB-2xx	126	3.0 or later

WEB-6xx	126	3.0 or later

WEB-7xx	126	3.5

* 128 total devices supported. One node used by controller and one for a repeater. A repeater is required if more than 64 devices are on a bus.

TIPS AND THINGS YOU NEED TO KNOW

•Each thermostat is delivered from the factory with the default MAC address set at 254. At this value, BACnet communication is NOT active and the device will not participate in the token pass either. The local LED status for the communication adapter at this point is one short flash only. To enable BACnet communication, set the local MAC address configuration property of the thermostat to any valid value from 0 to 127.

•After the initial configuration of your device and if your BAS allows you to remove objects, we suggest that you remove all the configuration objects to prevent unnecessary polling of non used objects and to help speed up the network.

•All configuration objects are available and accessible locally from the device itself using the local configuration routine. Please refer to the PIR Application Guide for TB7200 and TB7300 Series Thermostats (form number 63-4526).

•In its default mode of operation, the device will automatically match its baud rate to the baud rate of the network. Automatic baud rate detection will occur when the MS/TP communication port is initialized (on power up). If the network speed is changed, the device will keep listening at the previously detected speed for 10 minutes before resuming auto-bauding. Repowering the devices will force immediate auto-bauding.

•Enumeration sets for System Mode MV16 depends on Sequence of Operation (MV15) value upon device discovery. If required enumerations are not present, set MV15 to desired value and rediscover MV16 object. Available enumeration will now reflect required configuration.

•Enumeration sets for MV16 depends on Fan Mode Sequence (MV58) value upon device discovery. If required enumerations are not present, set MV58 to desired value and rediscover MV16 object. Available enumeration will now reflect required configuration.

•Enumeration sets for MV26 and MV27 depend on Control Type (BV75) value and Pipe Number (MV52) value upon device discovery. If required enumeration is not present, set BV75 and MV52 to desired value and rediscover MV26 and BV27 object. Available enumeration will now reflect required configuration.

•If the device should go off-line, the following binded thermostat parameters will be released:

•Room Temperature

•Outdoor Temperature

•Occupancy

•The BACnet Data Link layer has two key parameters: the device object name and the device object ID. The device object name must be unique from any other BACnet device object name on the BACnet network (i.e. not just the MS/TP subnetwork). The device object ID must be unique from any other BACnet device object ID on the entire BACnet network (i.e. not just the MS/TP sub-network).

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

•To assign a Room Temperature (AV7) value manually, users must first enable the Override mode in the Room Temp Override (BV8) object.

•To assign a Room Humidity (AV10) value manually, users must first enable the Override mode in the Room Humidity Override (BV11) object.

•Device Name and Device ID properties are writable in Honeywell device object. Both properties can be renamed from any BACnet network management tool as long as the tool itself give access to write to these properties.

WIRING GUIDELINES

Overview

Honeywell uses EIA-485 as the physical layer between their devices and supervisory controllers

For clarity we will use the term “Device” to represent any product with an active EIA-485 network connection, including Honeywell and non-Honeywell thermostats.

Table 2. Summary of Specifications for a Honeywell EIA-485 Network

Parameter	Details
Media	Twisted pair 22AWG-24 AWG, shielded recommended
Characteristic Impedance	100-130 ohms
Distributed capacitance	Less than 100 pF per meter (30 pF per foot)
Maximum length per segment	1200 meters (4000 feet)
Polarity	Polarity sensitive
Multi-drop	Daisy-chain (no T connections)
Terminations	1. TB7200, TB7300 and/or TB7600 Series thermostat devices
	are installed at both ends of the MS/TP network:
	120 Ohms resistor should be installed at each end.
	2. A TB7200, TB7300 or TB7600 Series thermostat is installed at
	one end of the MS/TP network and another device is installed
	at the other end:
	Install an End-Of-Line resistor value that matches the other
	device’s instructions regarding the End-Of-Line resistors
	3. Other devices are installed at both ends of the MS/TP
	network:
	Follow the other device’s instructions regarding the End-Of-Line
	resistors.
Maximum number of nodes per segment	64 (Honeywell devices only)
Maximum number of nodes per network	128
Baud rate	9600, 19200, 38400, 76800 (Auto detect)

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

Cable Type

Honeywell recommends the use of balanced 22-24 AWG twisted pair with a characteristic impedance of 100-130 ohms, capacitance of 30 pF/ft or lower. A braided shield is also recommended.

Impedance

A value based on the inherent conductance, resistance, capacitance and inductance that represent the impedance of an infinitely long cable. The nominal impedance of the cable should be between 100Ωand 120Ω. However using120Ω will result in a lighter load on the network.

Capacitance (pF/ft)

The amount of equivalent capacitive load of the cable, typically listed in a per foot basis. One of the factors limiting total cable length is the capacitive load. Systems with long lengths benefit from using low capacitance cable (i.e. 17pF/ft or lower).

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

NETWORK CONFIGURATION

EIA-485 networks use a daisy chain configuration. A daisy chain means that there is only one main cable and every network device is connected directly along its path.

Figure 1 illustrates two improper network configurations and the proper daisy chain configuration.

Other methods of wiring an EIA-485 network may give unreliable and unpredictable results. There are no troubleshooting methods for these types of networks. Therefore, a great deal of site experimentation may have to be done, making this a difficult task with no guarantee of success. Honeywell will only support daisy chain configurations.

STAR CONFIGURATION	BUS CONFIGURATION	DAISY CHAIN
		CONFIGURATION
		M32571

Fig. 1. Three different network configurations: star, bus, and daisy chain.

Only the daisy chain configuration is correct for an EIA-485 network.

Maximum Number of Devices

A maximum of 64 nodes is allowed on a single daisy chain segment. A node is defined as any device (controller, thermostat, repeater, etc.) connected to the RS485 network. Terminators do not count as a node.

NOTE: Biasing is not required with this series of devices.

To determine the number of nodes on a network, add the following:

•One node for each device, including the controller

•One node for each repeater on the chain

For the example in Figure 2, we have one node for the controller, plus 4 for the thermostats for a total of 5 nodes.

END OF LINE RESISTOR DOES

NOT COUNT AS A NODE

EOL	EOL
SC
NODE 2	NODE 3 NODE 4 NODE 5
NODE 1
	LEGEND

EOL: END OF LINE RESISTOR

SC: SUPERVISORY CONTROLLER

M32572

Fig. 2. Five nodes network example.

If you have more than 64 devices, then repeaters are required to extend the network.

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

Maximum Cable Length

The maximum length of a chain is related to its transmission speed. The longer the chain, the slower the speed. Using proper cable, the maximum length of an EIA-485 daisy chain is 4000-ft (1200 m). This will only work reliably for data rates up to 100,000 bps. The maximum data rate is 76,800 bps for TB7200 and TB7300 Series thermostats.

If you require a maximum network length of more than 4000 feet, then repeaters are required to extend the network.

EIA-485 Repeaters

If you have more than 64 devices, or require a maximum network length of more than 4000 feet, then repeaters are required to extend the network. The BASRT-B repeater by Contemporary Controls can be used if a repeater is needed. The best configuration is to daisy chain the repeaters to the controller. From each of these repeaters, a separate daisy chain will branch off. Figure 3 demonstrates a valid use of repeaters in an EIA-485 network.

EOL	EOL	EOL
	R
SC
	EOL	EOL
	R
	EOL	EOL

EOL

LEGEND

EOL: END OF LINE RESISTOR

R: RS485 REPEATER

SC: SUPERVISORY CONTROLLER

M32573

Fig. 3. Correct usage – repeaters are daisy chained to the supervisory controller and separate daisy chains branch from each repeater.

Do not install repeaters in series, as this may result in network reliability problems. Figure 4 demonstrates an incorrect use of a repeater in an EIA-485 network.

EOL

DO NOT ADD

SECOND

REPEATER R

IN SERIES

EOL

LEGEND

EOL: END OF LINE RESISTOR

R: RS485 REPEATER

SC: SUPERVISORY CONTROLLER

M32574

Fig. 4. Incorrect usage – the second repeater in series may result in an unreliable system.

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

End Of Line (EOL) Resistors

MS/TP network must be properly terminated. For daisy chain configurations, you must install an EOL resistor at each end of the daisy chain. Depending on your MS/TP network configuration, the resistance value of the EOL resistor may change:

•TB7200, TB7300, or TB7600 Series devices are installed at both ends of the MS/TP network:

•120 Ohms resistor should be installed at each end.

•A TB7200, TB7300, or TB7600 device is installed at one end of the MS/TP network and another device is installed at the other end:

•Install an End-Of-Line resistor value that matches the other device’s instructions regarding its EOL resistor value;

•Other devices are installed at both ends of the MS/TP network:

•Follow the other device’s instructions regarding its EOL resistor value.

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

NETWORK ADAPTER

The polarity of the connection to the cable is important. From one module to the other it is important that the same colored wire be connected to “plus” or “+” and the other colored wire be connected to the “minus” or ”-“. Figure 5 shows the proper MS/TP connections and the location of the Status LED. This Status LED may help to troubleshoot network problems.

Fig. 5. Correct MS/TP connections and location of a Status LED on a BACnet module

IMPORTANT NOTE: The Ref terminal should NEVER be used to wire shields. The 2 shields from each feed of the network connection to a thermostat should be wired together in the back of the thermostat and properly protected to prevent any accidental connection to the ground.

The joined shield connection should then be grounded at a SINGLE point on the whole segment. More than one ground connection to a shielded wire may induce ground loop noises and affect communication.

Network Adapter Status LED

Table 3 shows the different possibilities with the Status LED behavior for a BACnet module.

Table 3. Status LED condition and possible solutions.

Condition of the Status LED	Possible Cause	Solution

• 1 short blink	BACnet communication NOT active at	Change MAC address to another
	default MAC address = 254	value from 0 to 127

• 2 short blink (no wires	The right module has been installed on	N/A
connected to the module)	the right thermostat model	N/A
	the right thermostat model

• 2 short blink (wires connected	Module is not at the same baud rate as	Power off and on the thermostat
to the module)	the network	Power off and on the thermostat
	the network

• 2 short blinks and a longer blink	The module has detected the presence
(wires connected to the	The module has detected the presence	N/A
(wires connected to the	of a network	N/A
module)	of a network

• Right after power is applied: 2	Polarity has been reversed at the	Reverse polarity at the module
long blinks and then no blinking	module	Reverse polarity at the module
	module

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BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

INTEGRATION

Global Commands

The following figure shows which objects from the thermostat can be monitored and commanded from the BAS front-end.

GLOBAL COMMANDS ALL DEVICES (ALL THERMOSTATS)

OUTDOOR TEMPERATURE OUTDOOR TEMPERATURE (AV9) OUTDOOR TEMPERATURE AND OUTDOOR HUMIDITY (ENTHALPY) DEHUMIDIFICATION LOCKOUT (BV13)

OUTDOOR TEMPERATURE AND HVAC PLANT CURRENT MODE SEQUENCE OF OPERATION (MV15)

SYSTEM MODE (AV16)

GLOBAL COMMANDS SPECIFIC DEVICES (SPECIFIC AREA THERMOSTATS)

SCHEDULE OCCUPANCY (MV18) SCHEDULE AND OUTDOOR TEMPERATURE FAN MODE (MV17)

OCCUPIED HEATING SETPOINT (AV39)

UNOCCUPIED HEATING SETPOINT (AV43)

OCCUPIED COOLING SETPOINT (AV40)

UNOCCUPIED COOLING SETPOINT (AV44)

RESTRICT USER ACCESS TO THERMOSTAT KEYPAD LOCKOUT (MV19) ROOM TEMPERATURE FOR TESTING AND OVERRIDE ROOM TEMPERATURE (AV7)

REMOTE CONTROL OF THE AUXILIARY OUTPUT AUX OUTPUT (BV14)

	MSTP NETWORK
BAS FRONT-END		TB7300 SERIES TSTAT
GLOBAL COMMAND CONTROL LEVEL		DEVICE LEVEL	MCR32655

Fig. 6. Global commands from a BAS front-end to a typical TB7300 Series thermostat.

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