Honeywell TB7200, TB7300 WIRING GUIDELINES

BACNET INTEGRATION MANUAL FOR TB7200 & TB7300 SERIES THERMOSTATS

363-4524—01

• 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

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)