This code system http://hl7.org/fhir/device-operation-mode defines the following codes:

CodeDisplayDefinition
normal NormalThe device operates in a mode that supports the fulfillment of its clinical functions.
demo DemoThe device operates in a mode that is intended for demonstration purposes only. Arbitrary values are generated.
service ServiceThe device operates in a mode that is intended for correcting a functional problem of the device only. Arbitrary values may be generated.
maintenance MaintenanceThe device operates in a mode that is intended for preventative and/or scheduled maintenance purposes only.
test TestThe device operates in a test mode that is not intended to be used for production/operational purposes.
<status value="active"/><experimental value="false"/><date value="2022-03-28T10:01:24+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="The operation mode of the device."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/device-operation-mode"/><content value="complete"/><concept><code value="normal"/><display value="Normal"/><definition value="The device operates in a mode that supports the fulfillment of its clinical functions."/></concept><concept><code value="demo"/><display value="Demo"/><definition value="The device operates in a mode that is intended for demonstration purposes only. Arbitrary values are generated."/></concept><concept><code value="service"/><display value="Service"/><definition value="The device operates in a mode that is intended for correcting a functional problem of the device only. Arbitrary values may be generated."/></concept><concept><code value="maintenance"/><display value="Maintenance"/><definition value="The device operates in a mode that is intended for preventative and/or scheduled maintenance purposes only."/></concept><concept><code value="test"/><display value="Test"/><definition value="The device operates in a test mode that is not intended to be used for production/operational purposes."/></concept></CodeSystem>