SAE standard J1850 is available for $63 from http://www.sae.org/technical/standards/J1850_200606 "This SAE Standard establishes the requirements for a Class B Data Communication Network Interface applicable to all on and off- road land based vehicles. "
ISO9141/2 is available for $28 at http://www.sae.org/products/standards/ISO9141_2.htm "This part of ISO 9141 describes a subset of ISO 9141:1989. It specifies the requirements for setting up the interchange of digital information between on-board emission-related Electronic Control Units (ECUs) of road vehicles and the SAE OBD II scan tool as specified in SAE J1978."
But as http://www.northstarlabs.com/rp6.htm notes, there is significant divergence in the implementation of the physical layer used by auto mfgrs between SAE J1850 and ISO-9141
http://www.obd-ii.com/ is the ODB-II home page "Dedicated to helping the home and independent technician understand and use OBD-II technology." Well... actually they sell a $250 PC-Auto interface. They do list the DTC codes (cached 20010220135132) however.
Vitaliy M. says: nothing beats having the actual standards (SAE J1850, J1979, ISO9141-2, etc.), but free information is also available:
ScanTool.net - info, schematics, pc2obdii interfaces
Elm Electronics - protocol converter chips for OBD-II
Implementing the J1850 protocol - by Intel
http://www.can-cia.de/ - CAN in Automation (see CAN->Applications->Automotive)
|file: /Techref/io/cars.htm, 2KB, , updated: 2013/7/22 16:18, local time: 2019/12/10 00:48,
|©2019 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.massmind.org/techref/io/cars.htm"> Automobiles</A>
|Did you find what you needed?|
Welcome to massmind.org!
Welcome to www.massmind.org!