General DeviceAlert example

{
  "resourceType" : "DeviceAlert",
  "id" : "example",
  "identifier" : [{
    "use" : "official",
    "type" : {
      "text" : "Alarm Unique Id"
    },
    "value" : "0600dcFFFF750001^^^EUI-64_d1130a75-316c-4401-88c4-9c71704cdf6b_d629bc41-0310-4fec-b1a4-41356b66a7eb"
  }],
  "status" : "in-progress",
  "type" : "physiological",
  "priority" : "medium",
  "code" : {
    "coding" : [{
      "system" : "urn:iso:std:iso:11073:10101",
      "code" : "196670",
      "display" : "MDC_EVT_LO"
    }]
  },
  "subject" : {
    "reference" : "Patient/pat1"
  },
  "presence" : true,
  "device" : {
    "reference" : "Device/example"
  },
  "derivedFrom" : [{
    "observation" : {
      "reference" : "Observation/f0f9274d-8ada-402b-afa9-b9468ca50510",
      "type" : "Observation"
    },
    "limit" : {
      "low" : {
        "value" : 87,
        "unit" : "MDC_DIM_PERCENT",
        "system" : "urn:iso:std:iso:11073:10101",
        "code" : "262688"
      },
      "high" : {
        "value" : 98,
        "unit" : "MDC_DIM_PERCENT",
        "system" : "urn:iso:std:iso:11073:10101",
        "code" : "262688"
      }
    }
  }],
  "acknowledged" : false,
  "label" : "**SpO2   86  <87  ",
  "signal" : [{
    "activationState" : "on",
    "presence" : "on",
    "annunciator" : {
      "reference" : {
        "reference" : "Device/example",
        "type" : "Device"
      }
    },
    "manifestation" : {
      "coding" : [{
        "system" : "http://hl7.org/fhir/devicealert-manifestation",
        "code" : "visual",
        "display" : "Visual"
      }],
      "text" : "visual alert"
    }
  }]
}