The Centron Environmental Monitoring and Access Control System offers centralized alarm notification and data collection for critical refrigerators, freezers, incubators, LN2 storage, stability chambers, and animal rooms. The output control feature provides control and monitoring of animal room lighting and watering systems. The system offers 12-bit 0.1 resolution, and 32-bit architecture allows for instantaneous communication between the node and user workstations. There is infinite buffering on the node, and it plugs directly into the user's network and stores data directly to network files. An electronic signature feature complies with the FDA 21-CFR-11 electronic signature requirement. Automated Reading and Event reports can print out automatically every 4, or 24, hours. A complete audit trail logs all changes made to the system software.