Protocol scope and method
Status bits combine boolean states and sign conventions. Hemisphere bits change the sign of decoded coordinates.
Set states = bit mask; latitude/longitude signs follow hemisphere bits.
Diagnostic scenario
Extract the status word beside a decoded 0x0200 coordinate pair. Inspect ACC, positioning and hemisphere bits first, then compare door, circuit and satellite states with a controlled terminal condition rather than an unrelated production timestamp.
How to interpret the result
Some bits change how other fields are interpreted, especially coordinate sign. Unknown or profile-specific bits remain visible by number. A state word is a snapshot reported by the terminal and can be stale if capture ordering or device time is wrong.
Input reference
- Status word (hex)
- Example default: Sample input included
Common mistakes
- Using an unredacted production capture with vehicle, credential or network identifiers.
- Interpreting status bits independently from their location record.
- Treating a successfully parsed sample as standards compliance or interoperability proof.
Before using the result
- Confirm the protocol edition, transport framing and vendor profile before interpreting fields.
- Validate sign-changing bits with known north/south and east/west samples.
- Keep a redacted known-good and known-bad sample as a regression pair.
Questions to check during diagnosis
Does the JT/T 808 Vehicle Status Decoder leave my browser?
No application upload is used. Avoid putting sensitive production data in shareable URLs.
Is this a standards compliance test?
No. Confirm the edition and vendor profile with licensed documents and your target platform.
Offline diagnostic aid. Verify fields, version and vendor extensions before production use.