ALDL REQUEST:
- MESSAGE ID = $F4
- MESSAGE LENGTH = $57
- MODE NUMBER = $01
- MESSAGE NUMBER = $00
- CHECKSUM

TP Mode 1 Message 0 send says "0xF4 0x57 0x01 0x00 0xB4" So what is the "0xB4" for?


The "0xB4" is the checksum.

Luke Skaff's senior engineering project was to build a scanner tool. He documents the commands in Appendix A Table 7. The request command is at the top of the table with the response below.


http://lukeskaff.com/?page_id=305


You can get his original report,
Senior_Project_2007_Automotive_Diagnostic_LCD_Inte rface.pdf


Look under the section (or do a google search).
4. College Senior Project Final Report

Robert