ISO 11519-3:1994/Amd 1:1995

Overview

ISO 11519-3:1994/Amd 1:1995 is an international standard issued by the International Organization for Standardization (ISO) that focuses on low-speed serial data communication in road vehicles. Specifically, it addresses Part 3 of the ISO 11519 series, which defines the Vehicle Area Network (VAN). This amendment introduces enhancements to the existing standard to increase data transmission speeds up to 250 kTS/s while maintaining reliability.

The Vehicle Area Network (VAN) is an established communication protocol used in automotive electronics for reliable, low-speed serial data communication among nodes within a vehicle. This amendment refines system parameters, transceiver characteristics, and filter specifications to support improved performance and robustness in automotive network communications.

Key Topics

• Increased Data Transmission Speed
  The amendment enables data transfer rates up to 250 kTS/s, improving system responsiveness without compromising reliability. This enhancement corresponds to 125 kbit/s using Manchester coding and 200 kbit/s in Enhanced Manchester coding.

• Detailed System and Filter Specifications
  It provides comprehensive descriptions and parameter values for system components such as filters and transceivers. For example:

  • Recommended capacitance and resistance values for filter design ensure signal quality.
  • Cable characteristics including capacitance and insulation parameters are defined for optimal network performance.

• Transceiver Specifications
  Detailed transceiver design parameters include driver and receiver sections, with specific electrical characteristic ranges ensuring robust communication. Emphasis is placed on current output behavior, propagation delays, input hysteresis, and comparator offsets.

• Transient and Continuous Stress Capability
  The network interface complies with automotive transient pulse requirements (ISO 7637 part 1), and it is designed to operate reliably under continuous +/- 24 V conditions on communication lines, reflecting real automotive electrical environments.

• Network Topology and Timing
  The amendment supports up to 12 connected nodes in a VAN, with precise timing definitions to maintain protocol integrity at higher speeds. It specifies timing characteristics like sample points, propagation delays, and timing slot definitions.

• Ground Offset Handling
  Provisions for nominal and degraded communication modes account for possible line or node failures, enhancing network resilience.

Applications

ISO 11519-3:1994/Amd 1:1995 is highly relevant for automotive manufacturers and suppliers focused on vehicle electronic systems. Key practical applications include:

• In-Vehicle Network Design
  Automotive engineers designing CAN alternatives or complementary VAN systems benefit from standardized communication protocols supporting up to 250 kTS/s data rates.

• Electronic Control Units (ECUs)
  Development of ECUs that require robust, low-speed data interchange within vehicle subsystems such as body control, climate control, diagnostics, and infotainment.

• Automotive Component Integration
  Facilitates interoperability of electronic components from different suppliers by adhering to common data link and physical layer requirements.

• Automotive Testing and Validation
  Validation engineers apply the amendment’s specifications to ensure network systems meet stringent operational criteria, including transient stress and continuous voltage tolerance.

Related Standards

• ISO 11519-1 / ISO 11519-2
  These parts of ISO 11519 address other aspects of low-speed serial data communication, including general definitions and the Controller Area Network (CAN) standard.

• ISO 7637 Part 1
  Defines transient pulse requirements for automotive electronic equipment, referenced by this amendment for stress tolerance tests.

• ISO 11898 (CAN)
  Though distinct from VAN, CAN protocols often integrate or co-exist with VAN systems in vehicle networks.

• ISO 14229 (UDS - Unified Diagnostic Services)
  Provides higher-layer diagnostic protocols often implemented over physical layers such as VAN.

Summary

ISO 11519-3:1994/Amd 1:1995 amendment enhances the Vehicle Area Network standard by supporting higher reliability communication at increased data speeds up to 250 kTS/s while maintaining automotive-grade robustness. By specifying precise filter designs, transceiver parameters, and system characteristics, this amendment ensures the VAN remains a reliable and interoperable communication solution within modern road vehicles.

Keywords: ISO 11519-3 Amendment, Vehicle Area Network, VAN protocol, automotive serial communication, low-speed data communication, automotive transceiver standards, automotive network timing, VAN filters, automotive network stress tolerance, ISO 7637 compliance.