heavy-duty OBD standards support question
May be it is off topic, because my question retates to heavy-duty (HD)vehicles OBD. I will be glad if somebody know about forums which deals with HDs.
Here my questions:
1) I am looking for heavy-duty vehicles manufacturers list that supports OBD standards J1708/J1587 and new J1939
2) This is more technical question. I want to know if Scan tools that support these standards can provide real-time data,
vehicle speed, for example.
The problem is that scan tool not connected directly to speed sensor.
So, the question is if vehicle ECU itlself can provide real-time data,
here I mean deterministic latency and/or if exists timestamps for this data.
Also, the question is if scan tool also can provide this data in real-time.
And if such latency is specifyed in standards J1708/J1587 and J1939 ?
3) If exists for standards J1708/J1587 and J1939 some chipset like as ELM for OBD-II interface ?
Thank you in advance