IF YOU ARE LOOKING AT THIS WITH A BROWSER, USE THE BACK BUTTON TO GET BACK TO THE PREVIOUS PAGE. YOU CAN ALSO DOWNLOAD THIS FILE BY GOING BACK AND RIGHT CLICKING ON THE LINK, THEN SELECTING THE APPROPRIATE COMMAND. THIS EXAMPLE DATA WAS LOGGED BY A MODIFIED VERSION OF DIAGNOSE.EXE It shows the exact data sent and received between a personal computer and the OBD interface circuit. It was connected to a vehicle, so you won't see any PIDs that the particular vehicle did not support. This is a plain text file, and it must be viewed using a fixed width font. If your browser doesnt properly show the columns, just download this file and use a simple text editor, such as notepad or wordpad (select a fixed font to make the columns allign properly). NOTES: The Control byte and Frame number are specific to the BR16F84-1.07 chip. Remaining data is strictly SAE OBD message bytes. Blank areas in a column do not denote a time delay, nor a zero value. The logfile was edited to make the columns line up with the proper heading text. ____________________________________________________________________ VEHICLE TYPE: PWM OBD II MODE 1 ____________________________________________________________________ Control Byte Frame Number Control Byte | | | | | | | _OBD REQUEST_ | | ____ OBD RESPONSE _____ | / \ | | / \ | Header M P C | | Header M P DATA BYTES C | | O I R | | | O I __|____ R | | D D C | | | D D / \ C | _| _ E | | _| _ E A B C D | / \ | | / \ Send 07 61 6A F1 01 00 0A 01 Recd 0A 41 6B 10 41 00 BE 1F B8 10 32 Send 07 61 6A F1 01 01 17 01 Recd 0A 41 6B 10 41 01 00 07 E1 01 7B Send 07 61 6A F1 01 03 2D 01 Recd 08 41 6B 10 41 03 00 00 5A Send 07 61 6A F1 01 04 7E 01 Recd 07 41 6B 10 41 04 00 90 Send 07 61 6A F1 01 05 63 01 Recd 07 41 6B 10 41 05 44 BB Send 07 61 6A F1 01 06 44 01 Recd 07 41 6B 10 41 06 80 2E Send 07 61 6A F1 01 07 59 01 Recd 07 41 6B 10 41 07 6A 02 Send 07 61 6A F1 01 0C 96 01 Recd 08 41 6B 10 41 0C 00 00 DC Send 07 61 6A F1 01 0D 8B 01 Recd 07 41 6B 10 41 0D 00 86 Send 07 61 6A F1 01 0E AC 01 Recd 07 41 6B 10 41 0E 80 74 Send 07 61 6A F1 01 0F B1 01 Recd 07 41 6B 10 41 0F 4A DF Send 07 61 6A F1 01 10 C7 01 Recd 08 41 6B 10 41 10 00 00 CE Send 07 61 6A F1 01 11 DA 01 Recd 07 41 6B 10 41 11 12 B2 Send 07 61 6A F1 01 13 E0 01 Recd 07 41 6B 10 41 13 03 FA Send 07 61 6A F1 01 14 B3 01 Recd 08 41 6B 10 41 14 07 80 17 Send 07 61 6A F1 01 15 AE 01 Recd 08 41 6B 10 41 15 08 FF D9 Send 07 61 6A F1 01 1C 5B 01 Recd 07 41 6B 10 41 1C 01 63 Send 06 61 6A F1 07 B8 01 Fail 81 80 Send 07 61 6A F1 01 01 17 01 Recd 0A 41 6B 10 41 01 00 07 E1 01 7B Send 07 61 6A F1 01 01 17 02 Fail 81 80 Note: Third line from end was a failure. This was a mode 7 request, and the vehicle had no codes, so it did not respond. The highest bit in the control byte was set by the interface to indicate no data was obtained. Similarly, the last line is a failure. This was a mode 1 pid 1 request, and the second frame was specified. The vehicle did not send a second frame, so again, the upper bit of the control byte was set to indicate no data received.