The status of the External Switch Gear.
unknown(1) indicates the device status is unknown.
notInstalled(2) indicates the device is not installed.
offOk(3) indicates the device status is off and OK.
onOk(4) indicates the device status is on and OK.
offFail(5) indicates the device status is off and failed.
onFail(6) indicates the device status is on and failed.
lostComm(7) indicates the device has lost communication.