✎ carberry:cmds:subsys:obd:query_new:query [Carberry Wiki]

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===== OBD QUERY =====

This command, can be used to query informations from OBD\\
Please refer to [[https://en.wikipedia.org/wiki/OBD-II_PIDs|OBD-II PIDs]]
OBD query replies are managed in multi-frame format if data payload exceeds 7 bytes.

Starting from firmware version v1.17 is possible to trasmit requests over K-line connecting the LIN wire to K-line.
To directing the messages on K-line use the format OBD QUERY K.


==== Synopsis ====

  OBD QUERY CH<1/2>|K <mode><PID>

==== Arguments ====

^Param ^Description^Range^
|<mode>|mode for placing query value.|0x00 - 0xFF|
|<PID>|PID of which query value.|0x00 - 0xFFFFFFFFFFFF (1 to 6 bytes)|


==== Return ====

Then the ECU in the car, replies with its message containing requested data.\\
Query command returns OBD data values returned by the vehicle.\\
If the response len is max 7 bytes then the format of the data returned to user terminal is the following:

  <VAL> [<VAL>] [<VAL>] [<VAL>]
  OK

For CAN bus connection if the response len is greater than 7 bytes then the format of the data returned to user terminal is the following:
   <len> ( 3 HEX chars )
  0:  <VAL><VAL><VAL><VAL><VAL><VAL>
  [n:  <VAL><VAL><VAL><VAL><VAL><VAL>] a number of indexed rows to reach len qty
  OK

The reply contain bytes always represented in HEX notation and separed by one ASCII space.

==== Examples ====

Query air temperature (CAN bus):

  OBD QUERY CH1 010F
  03 64
  OK
  
Query engine RPMs (CAN bus):

  OBD QUERY CH1 010C
  13 25
  OK

Query engine RPMs (K-line):

  OBD QUERY K 010C
  13 25
  OK