Wiring Guidelines - Honeywell TB7200 Integration Manual

• 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.
Parameter
Media
Characteristic Impedance
Distributed capacitance
Maximum length per segment
Polarity
Multi-drop
Terminations
Maximum number of nodes per segment
Maximum number of nodes per network
Baud rate
BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS
Table 2. Summary of Specifications for a Honeywell EIA-485 Network
Details
Twisted pair 22AWG-24 AWG, shielded recommended
100-130 ohms
Less than 100 pF per meter (30 pF per foot)
1200 meters (4000 feet)
Polarity sensitive
Daisy-chain (no T connections)
1. TB7200, TB7300 and/or TB7600 Series thermostat devices
2. A TB7200, TB7300 or TB7600 Series thermostat is installed at
3. Other devices are installed at both ends of the MS/TP
64 (Honeywell devices only)
128
9600, 19200, 38400, 76800 (Auto detect)
are installed at both ends of the MS/TP network:
120 Ohms resistor should be installed at each end.
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
network:
Follow the other device's instructions regarding the End-Of-Line
resistors.
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