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this is my first Ask :D and i really haven't find something around. I've already developed an app that read a lot of informations from attached ELM327 via standard OBD Pid commands and some other via CanBus. But i have to read from different Headers in very strictly times and i would avoid to send 2 commands have the info (actually this is causing many reading errors between each read). This happen because in time X i send the header setting (ex AT SH 7AA) and then relative Pid request (ex 010A) but right after (X+1) i have to send a request on another header (ex AT SH 7BB) and relative Pid (ex 020B). So i would know if i could send a sort of "AT 7AA-010A" and not AT SH 7AA + AT 010A Any help will be greatly appreciated. Regards, Luca.

Duca Oscuro
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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Mar 05 '22 at 03:32
  • Sorry then. I'll try to be more clear. I need to know if i could send a UNIQUE AT command with Header And Data instead of an AT for setting Header and another to send the data to the header. Instead of: AT 7AA and AT 010A use something like: AT 7AA 010A – Duca Oscuro Mar 05 '22 at 13:58

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With ELM327 (and the behemoth of clones), it‘s not possible. You will have to consecutively switch header and then send PIDs. The STN-chipset based OBD2 adapters can do something like that, they have an enhanced command set. Then again, for your application it might be better to utilize a real CAN adapter as opposed to an OBD2 one, since the former has no limits whatsoever.

Dharman
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DrMickeyLauer
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    Thank you VERY much. Your reply clarify me the things well. Probably now it's time for me to go with a real CAN adapter (also for reading speed frequency). Thank you again – Duca Oscuro Mar 07 '22 at 10:15