DB9 Serial RS232 OBD2 Cable

DB9 Serial RS232 OBD II Cable provides a direct physical interface between a vehicle’s OBD-II diagnostic port and equipment using a DB9 serial connector. OBD-II (On‑Board Diagnostics) is widely implemented across modern vehicles, enabling access to real‑time data and diagnostic information from the engine control unit (ECU). This automotive diagnostic adapter bridges the vehicle communication port with RS232 serial hardware, allowing developers, technicians, and automotive hackers to capture ECU data, monitor vehicle parameters, and integrate car diagnostics into custom hardware systems.

Direct OBD-II to RS232 Connectivity

This diagnostic interface cable connects a standard OBD‑II male connector to a DB9 female serial port, enabling straightforward integration with RS232-based diagnostic tools, embedded controllers, and automotive data logging systems. The wiring configuration exposes critical communication and power pins from the vehicle’s OBD-II interface, providing reliable access to CAN and legacy communication lines used by automotive ECUs.

Essential Tool for Vehicle Data Access and Development

Designed for engineers and automotive enthusiasts, this serial OBD adapter simplifies access to vehicle diagnostics during development and troubleshooting. The cable allows direct hardware-level connection for ECU communication experiments, vehicle telemetry projects, or custom diagnostic equipment. A durable cable length and clearly mapped pin definition ensure compatibility with many development environments that rely on DB9 serial communication.

This vehicle diagnostic cable supports automotive research, ECU debugging, custom data logging platforms, and experimental car‑hacking projects. The adapter is suitable for automotive electronics prototyping, embedded system integration, and workshop diagnostic setups where reliable access to OBD-II signals through an RS232 interface is required.

Pin Definition Table

• P1 DB9 Female → P2 OBD II Male
• 1 → 5
• 2 → 4
• 3 → 6
• 4 → 7
• 5 → 14
• 6 → 10
• 7 → 2
• 8 → 15
• 9 → 16