The RS485 version of the Novus N322 PT100 is a digital temperature controller for heating or cooling purposes with 2 independent setpoints, giving 2 relay outputs with independent parameters for direct control of elements, compressors, fans, and valves — no SSR required for simple installation, backed by a 16A relay with Novus reliability. With RS485 built in, it uses Modbus for remote monitoring and integrates with SCADA or a PLC via a serial network, making it well suited to HVAC retrofits, machinery and OEM builds, and catering equipment.
Operating range is -50 to +300 degrees Celsius. The output control can be refined with adjustable hysteresis and on/off time delays, giving a gentle response with thermostatic control. The N322 will replace or upgrade the majority of manual or programmable thermostats used in industry. With the RS485 version, parameters such as setpoint (SV) and process value (PV) can be read from the device using the Modbus register table.
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Novus N322 Datasheet DownloadTechnical Details
SIZE: 75 x 33 x 75 mm. PANEL CUTOUT: 70 x 29 mm (+0.5 -0.0 mm). SUPPLY: 100~240 Vac (±10%)
INPUT: PT100 (also available as NTC Thermistor, Thermocouple J/K/T — see below)
OUT1: Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive). OUT2: Relay 3 A / 250 Vac, SPST
Sensor is chosen at time of purchase: NTC Thermistor 10kΩ @ 25°C, Range -50 to 120°C, Accuracy 0.6°C (NTC probe supplied, operating range -30 to +105°C, 3m cable extendable to 200m) / Pt100, Range -50 to 300°C, α=0.00385, 3 wires, Accuracy 0.7°C / Thermocouple J, Range 0 to 600°C, Accuracy 3°C / Thermocouple K, Range -50 to 1000°C, Accuracy 3°C / Thermocouple T, Range -50 to 400°C, Accuracy 3°C
Frequently Asked Questions
What can I read via Modbus?
Parameters such as setpoint (SV) and process value (PV) can be read from the device — the full Modbus Register Table is linked above.
Does this still work as a standalone thermostat if I don't connect RS485?
Yes — RS485 is an optional extra for remote monitoring; the controller functions as a standard standalone N322 thermostat without it.
Is there a version without RS485?
Yes, see the standard N322 PT100.
Industry Applications
- SCADA-Integrated HVAC — RS485 Modbus allows centralised monitoring across multiple thermostats.
- HVAC Retrofit — direct upgrade path from bimetallic or capillary thermostats.
- OEM Machinery — 16A relay drives elements, compressors, or fans without an SSR.