An ASCII string containing the 8 flags representing
the current alarm state of the ARU. If the state of
the ARU is unknown, this variable is set to 'UNKNOWN'.
The flags are numbered 1 to 8, read from left to
right. The flags are defined as follows:
Flag 1: Fan Fail 1
Flag 2: Fan Fail 2
Flag 3: Fan Fail 3
Flag 4: Smoke (if ARU is equipped with smoke detector)
Flag 5: High Temp (Out of Thermal Control)
Flag 6: Over Temp (Exhaust Temp. Exceeds Override Setpoint)
Flag 7: Fan Fail 4 (Gen 2 ARU only)
Flag 8: Reserved