The status of the present monitored.
Options:
1.normal(1) -indicates that the measurement value is lower than the set high
limit of the alarm, and higher than the low limit
2.overWorkHigh(2) -indicates that the measurement value is higher than the high limit of the alarm
3.belowWorkLow(3) -indicates that the measurement value is lower than the low limit of the alarm
4.abnormal(4) -indicates that the measurement value is outside the scope of limit of the alarm
5.invalid(-1) -indicates that the device can not get the value, e.g. the EMU does not support this operation, or the EMU state is abnormal