Honeywell TB7200 Integration Manual page 4

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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