The Carrier TB and TM Series Thermostats available in BACnet (TB series) or MODBUS (TM series) communication protocols come with a variety of options and features for a wide range of HVAC applications.
TB Series (BACnet MS/TP)
Options:
24 V, Temperature only
24 V, Temperature + Humidity + Motion
110–220 V, Temperature only
Communication: BACnet MS/TP (subordinate device)
Baud rates: Up to 76.8 kbps, automatically detected
TM Series (Modbus RTU)
Options:
24 V, Temperature + Humidity
110–220 V, Temperature only
Communication: Modbus RTU (server)
Baud rates: Up to 76.8 kbps, automatically detected
24 VAC ±15%, 4 VA (no load), 76 VA full load, or
110–220 VAC (model dependent)
Temperature
Range: 41–95°F (5–35°C)
Accuracy: ±1°F (±0.5°C)
Humidity (where applicable)
Range: 10–90% RH
Accuracy: ±3% typical
Motion (TB‑24‑HM models only)
Sensor type: PIR, quad, omnidirectional
Detection distance: 16.4 ft (5 m)
Detection range: 90° × 30° (H × V)
Inputs
T1: Dry contact (NO/NC), 0–10 VDC AI, or 50 kΩ thermistor @ 77°F (25°C)
RS‑485: A / B communication terminals
Power: C / R – 24 VAC
Outputs
DO terminals rated up to 3 A
Additional DO or AO outputs: 0–10 VDC, 5 mA max (not isolated)