24 RS485 Interface cable Type
Wiring the wallplate
All wiring must comply with local electrical codes and ordinances. Supports 14-
26AWG (0.2-1.5mm2 for solid or stranded, max 2.5mm2 for solid) wires. Follow
equipment manufacturer wiring instructions when available. A letter code is
located near each terminal for identification.
RS485 Interface cable Type
One or two pairs (depending on the application) of twisted pairs complying with
EIA485 standard (level IV, 22AWG, solid core, non-shielded). e.g., J-Y-Y 2*2*0.8 or
shielded wire.
An MSTP EIA-485 network shall use shielded twisted pair cable with a characteris-
tic impedance between 100 and 130 ohms. Distributed capacitance between con-
ductors shall be less than 100 pF per meter (30 pF per foot). Distributed
capacitance between conductors and shield shall be less than 200 pF per meter.
Thermostat powered by separate transformer
Fig 13. Thermostat Powered by Separate Transformer
The TC300s are connected to controller powered by separate Transformer.
If the TC300’s GND (C terminal) is connected to earth, the connection style must
comply with the requirement in the case of sharing a public power transformer.
If any device in the network is connected to earth or not electrically isolated, con-
necting the C wire to the corresponding device’s RS485 GND is recommended.
24VAC POWER R 24VAC power from Class2 transformer
24VAC POWER C 24VAC common (Neutral) from Class2
transformer
COM COM Common
Table 2 Terminal identification (Continued)
Terminal Name Terminal Label Description
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