ISO 16845-1:2016

Overview

ISO 16845-1:2016 - Road vehicles - Controller area network (CAN) conformance test plan - Part 1: Data link layer and physical signalling - specifies a standardized conformance test plan for the CAN data link layer and physical signalling defined in ISO 11898‑1. It applies to both Classical CAN and CAN FD protocols and defines test architecture, parameters and detailed test cases to verify correct implementation of frame handling, error management and bit-timing behaviour.

Key topics and technical requirements

This part of ISO 16845 focuses on measurable, repeatable conformance tests. Major topics include:

• Test architecture and organization - global overview, hierarchical test structure, and parameter definitions (communication and application parameters).
• Test types - mainly Test type 1 (received frames) and Test type 2 (transmitted frames) with organized test classes for format, errors and state transitions.
• Frame format validation - identifier formats (base/extended), DLC handling (including DLC > 8 for FD), and message validation procedures.
• Error detection and management - bit errors, stuff errors, CRC errors, form errors, error frame and overload frame handling, passive and active error states.
• Error counter (REC/TXC) behaviour - increment/decrement rules in response to errors and valid frames.
• Bit timing and synchronization - sample point tests, hard synchronization, phase error handling, synchronization window (SJW) considerations for both Classical CAN and CAN FD.
• Physical signalling and protocol exceptions - ACK/EOF behaviour, minimum bus idle times, and handling of non-nominal bits. These topics are expressed as concrete test cases and conditions to assess conformity with ISO 11898‑1.

Practical applications and who uses it

ISO 16845-1 is intended for:

• Automotive OEMs and ECU suppliers validating CAN controllers and transceivers.
• Conformance and certification test laboratories performing standardized CAN verification.
• Test equipment and tool vendors implementing test suites for CAN/CAN FD compliance.
• Quality, integration and system engineers responsible for in-vehicle network interoperability and robustness. Using ISO 16845-1 helps ensure deterministic behaviour, interoperability across suppliers, and reliable error handling in safety-critical vehicle networks.

Related standards

• ISO 11898‑1 - CAN data link layer and physical signalling (normative reference).
• Other parts of the ISO 16845 series (test plans) complement Part 1 by addressing further protocol or conformance aspects.

Keywords: ISO 16845-1:2016, CAN conformance test plan, Controller Area Network, data link layer, physical signalling, Classical CAN, CAN FD, CAN testing, bit timing, error handling, automotive network compliance.