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carberry:cmds:subsys:obd:query_new:query [2017/06/29 17:00] (current)
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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
 +  ​