Network Port
EIA‑485 port for BACnet MS/TP communications
Baud rate selectable via DIP switches

Comm Option Port
For future LON option card

Local Access Port
For system startup and troubleshooting (115.2 kbps)

Rnet Port
For Carrier communicating room sensors and Carrier touchscreen user interface

Binary Inputs (2)

Remote Occupancy Contact / Fan Status
Condensate Overflow
Analog Inputs (4)

RH / CO₂ (0–5 VDC)
Supply Air Temperature (10k thermistor)
Room Air Temperature / T55 (10k thermistor)
Changeover Switch (dry contact) or Changeover Sensor (10k thermistor)
(10‑bit A/D resolution)

Binary Outputs (5)

High‑Speed Fan
Medium‑Speed Fan
Low‑Speed Fan
Two‑Pipe Valve / Heating Valve / Electric Heat Stage 1
Cooling Valve / Electric Heat Stage 1 (Type 5 Heat & Two‑Pipe)
(Relay contacts rated 1A max @ 24 VAC/VDC, normally open)

Analog Outputs (3)

Outside Air Damper
Two‑Pipe / Heating Valve
Cooling Valve
(0–10 VDC, 5 mA max, 8‑bit resolution using filtered PWM)

Electrical Protection
Real-Time Clock
10-year lithium CR2032 battery with minimum of 10,000 hours of trend data retention
LED Status Indicator