Protocol scope and method
The base body is parsed separately from optional extra-information TLVs. Latitude and longitude use unsigned integer values scaled by 10⁶.
lat = uint32 / 1,000,000; speed = uint16 / 10 km/h.
Diagnostic scenario
Extract only the 0x0200 message body after a valid common header. Decode the 28-byte base section, apply hemisphere status bits to coordinate signs and compare time, speed and coordinates with a redacted device event before parsing optional extra-information TLVs.
How to interpret the result
The base result is meaningful only with the accompanying status word. Zero coordinates can represent a real value or absent positioning depending on status and profile. Remaining bytes are not an error; they may be standard or vendor extra-information records.
Input reference
- 0x0200 body hex
- Example default: Sample input included
Common mistakes
- Using an unredacted production capture with vehicle, credential or network identifiers.
- Applying coordinate scaling without hemisphere and positioning status.
- 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.
- Check the 28-byte base boundary before decoding optional TLVs.
- Keep a redacted known-good and known-bad sample as a regression pair.
Questions to check during diagnosis
Does the JT/T 808 0x0200 Location 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.