Status of the communication between the environment monitoring unit and the device. The environmental condition can be tested only when the communication is normal. Options: 1.normal(1) - indicates that communication state is normal 2.shutdown(2) - indicates that communication state is shutdown 3.fault(3) - indicates that communication state is fault 4.abnormal(4) - indicates that communication state is abnormal 5.config(5) - indicates that communication state is config