> ## Documentation Index > Fetch the complete documentation index at: https://docs.catenatelematics.com/llms.txt > Use this file to discover all available pages before exploring further. # List HOS Violation Codes > Get a paginated list of Hours of Service (HOS) violation codes reference data ## OpenAPI ````yaml https://api.catenatelematics.com/v2/telematics/openapi.json get /v2/telematics/ref-hos-violation-codes openapi: 3.1.0 info: title: Telematics Data Service - REST API description: Telematics Data Service REST API. version: 0.1.0 servers: - url: https://api.catenatelematics.com description: Catena Telematics API security: [] tags: - name: Fleet Operations & Tracking description: >- Endpoints for tracking vehicles, trailers, assets, and trip activity — including locations, movements, and operational telemetry. Useful for monitoring utilization and real-time operational status. - name: Safety & Driver Behavior description: >- Endpoints that provide safety-related insights such as harsh braking, speeding, and other driver behavior events. Supports risk analysis and safety program automation. - name: Compliance & Regulation description: >- Endpoints covering regulated requirements including DVIR inspections, Hours of Service (HOS), violations, and IFTA fuel tax reporting. Helps organizations meet DOT/FMCSA and interstate regulatory obligations. - name: Maintenance & Vehicle Health description: >- Endpoints providing data for vehicle condition monitoring and maintenance workflows, such as DVIR defects and diagnostic sensor events. Enables early issue detection and reduced downtime. - name: Drivers & Users description: >- Endpoints related to driver and user identities, assignments, and operational context. Supports linking operational and safety data to specific individuals. - name: Reference Data (Supporting Tables) description: >- Lookup tables and enumerations that supply standardized codes, metadata, and classifications used across the API. - name: Analytics (deprecated) description: >- Endpoints providing analytical insights and aggregated data for vehicles, fleets, drivers, and trailers. paths: /v2/telematics/ref-hos-violation-codes: get: tags: - Reference Data (Supporting Tables) summary: List HOS Violation Codes description: >- Get a paginated list of Hours of Service (HOS) violation codes reference data operationId: list_hos_violation_codes_reference parameters: - name: cursor in: query required: false schema: anyOf: - type: string - type: 'null' description: Cursor for the next page title: Cursor description: Cursor for the next page - name: size in: query required: false schema: type: integer maximum: 1000 minimum: 1 description: Page size default: 300 title: Size description: Page size responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/_CursorPage_RefHosViolationCode_' '400': content: application/json: schema: $ref: '#/components/schemas/BadRequest' description: Bad Request '401': content: application/json: schema: $ref: '#/components/schemas/Unauthorized' description: Unauthorized '403': content: application/json: schema: $ref: '#/components/schemas/Forbidden' description: Forbidden '404': content: application/json: schema: $ref: '#/components/schemas/NotFound' description: Not Found '405': content: application/json: schema: $ref: '#/components/schemas/MethodNotAllowed' description: Method Not Allowed '409': content: application/json: schema: $ref: '#/components/schemas/Conflict' description: Conflict '422': content: application/json: schema: $ref: '#/components/schemas/UnprocessableEntity' description: Unprocessable Entity '429': content: application/json: schema: $ref: '#/components/schemas/TooManyRequests' description: Too Many Requests '500': content: application/json: schema: $ref: '#/components/schemas/InternalServerError' description: Internal Server Error '501': content: application/json: schema: $ref: '#/components/schemas/NotImplementedResponse' description: Not Implemented security: - Bearer: - telematics:read components: schemas: _CursorPage_RefHosViolationCode_: properties: items: items: $ref: '#/components/schemas/RefHosViolationCode' type: array title: Items total: type: integer minimum: 0 title: Total current_page: anyOf: - type: string - type: 'null' title: Current Page description: Cursor to refetch the current page current_page_backwards: anyOf: - type: string - type: 'null' title: Current Page Backwards description: Cursor to refetch the current page starting from the last item previous_page: anyOf: - type: string - type: 'null' title: Previous Page description: Cursor for the previous page next_page: anyOf: - type: string - type: 'null' title: Next Page description: Cursor for the next page type: object required: - items - total title: _CursorPage[RefHosViolationCode] BadRequest: properties: code: type: integer title: Code default: 400 message: type: string title: Message default: Bad Request detail: anyOf: - type: string - type: 'null' title: Detail type: object title: BadRequest Unauthorized: properties: code: type: integer title: Code default: 401 message: type: string title: Message default: Unauthorized detail: anyOf: - type: string - type: 'null' title: Detail type: object title: Unauthorized Forbidden: properties: code: type: integer title: Code default: 403 message: type: string title: Message default: Forbidden detail: anyOf: - type: string - type: 'null' title: Detail type: object title: Forbidden NotFound: properties: code: type: integer title: Code default: 404 message: type: string title: Message default: Not Found detail: anyOf: - type: string - type: 'null' title: Detail type: object title: NotFound MethodNotAllowed: properties: code: type: integer title: Code default: 405 message: type: string title: Message default: Method Not Allowed detail: anyOf: - type: string - type: 'null' title: Detail type: object title: MethodNotAllowed Conflict: properties: code: type: integer title: Code default: 409 message: type: string title: Message default: Conflict detail: anyOf: - type: string - type: 'null' title: Detail type: object title: Conflict UnprocessableEntity: properties: code: type: integer title: Code default: 422 message: type: string title: Message default: Invalid Request Body detail: anyOf: - items: $ref: '#/components/schemas/ValidationErrorDetail' type: array - type: 'null' title: Detail type: object title: UnprocessableEntity TooManyRequests: properties: code: type: integer title: Code default: 429 message: type: string title: Message default: Too Many Requests detail: anyOf: - $ref: '#/components/schemas/RetryAfterDetail' - type: 'null' type: object title: TooManyRequests InternalServerError: properties: message: type: string title: Message default: Internal Server Error type: object title: InternalServerError NotImplementedResponse: properties: code: type: integer title: Code default: 501 message: type: string title: Message default: Not Implemented detail: anyOf: - type: string - type: 'null' title: Detail type: object title: NotImplementedResponse RefHosViolationCode: properties: violation_code: type: string title: Violation Code description: Canonical HOS violation code (Catena-normalized). Primary key. category: type: string title: Category description: >- Normalized violation category (e.g., 'DRIVING_HOURS', 'WORKDAY', 'REST'). name: type: string title: Name description: Short display name for the violation (human-readable). description: type: string title: Description description: Detailed description of the violation rule/condition (display). type: object required: - violation_code - category - name - description title: RefHosViolationCode description: 'Reference: HOS violation codes' ValidationErrorDetail: properties: path: type: string title: Path input: type: string title: Input message: type: string title: Message error_type: type: string title: Error Type type: object required: - path - input - message - error_type title: ValidationErrorDetail RetryAfterDetail: properties: retry_after_seconds: type: integer title: Retry After Seconds message: type: string title: Message type: object required: - retry_after_seconds - message title: RetryAfterDetail securitySchemes: Bearer: type: oauth2 flows: clientCredentials: refreshUrl: >- https://auth.catenatelematics.com/realms/catena/protocol/openid-connect/token scopes: {} tokenUrl: >- https://auth.catenatelematics.com/realms/catena/protocol/openid-connect/token authorizationCode: refreshUrl: >- https://auth.catenatelematics.com/realms/catena/protocol/openid-connect/token scopes: {} authorizationUrl: >- https://auth.catenatelematics.com/realms/catena/protocol/openid-connect/auth tokenUrl: >- https://auth.catenatelematics.com/realms/catena/protocol/openid-connect/token ````