CDTA-2N000-LCD is a CDTA series communicating carbon dioxide detector which combines the function of three room sensors into a single, compact housing. Parameters include carbon dioxide, humidity, temperature, and temperature set point with override. A 4-wire connection and daisy chaining together reduces installation cost. The RS-485 MAC address is set up using on board DIP switches. Additional DIP switches are used to select Modbus® RTU or BACnet MS/TP and to limit access to the set up menu. The barometric pressure can be programmed to correct for altitude. The humidity sensor is field replaceable without the need for additional calibration. For environments occupied 24 hours per day it is recommended to periodically expose the CO2 sensor to outside ambient air. Application includes demand control ventilation in schools, office buildings, hospitals, and other indoor environments, LEED® certification.