Application Note

This application note shows how to acquire diagnostics from light vehicles using the OBD‑II interface and a Senquip device. It introduces the J1962 connector pinout, CAN bus particulars at 500 kbit/s, and safety precautions when working around vehicles. Step‑by‑step examples query standard PIDs (SAE J1979) for speed, RPM, coolant temperature, and DTCs, then parse responses into engineering units. The document explains request/response timing, arbitration IDs, and how to filter traffic to reduce load on the vehicle network. It discusses limitations: manufacturer‑specific PIDs, ignition state behaviour, and when to fall back to ELM‑style adapters. Scripts show how to present values on the Portal and create alerts for overheating or overspeed. With careful filtering and low‑impact polling, you can monitor fleet health, usage, and driver behaviour without interfering with normal vehicle operation.

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