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The Johnston Controls AS-UNT1126-0 is a universal network communicator module designed to facilitate seamless communication between various building automation and control devices. This device features a robust network interface that supports both BACnet MS/TP and Modbus RTU protocols, allowing for versatile integration within a wide range of industrial systems. Typical failures of this model include network connectivity issues, protocol communication errors, and power supply failures. Troubleshooting such problems often involves testing and replacing faulty components, updating firmware, and reconfiguring network settings.