STR710 and J1850

[tech9]

Posted on January 09, 2006 at 02:34

STR710 and J1850

[tech9]

Posted on November 30, 2005 at 11:02

Hi everyone,

We need to connect our STR710 with passenger cars, from 1996 and newer. They tend to provide an OBD interface, which follows the SAE J1850 norm. Ford uses PWM modulation, while GM uses VPW (variable pulse width) to carry information. That modulation is time based, so ones and zeroes are defined with length, not electrical levels.

My question: has anyone used a line transceiver or a device of some sort to successfully plug those protocols and retrieve information from the vehicle serial bus?

Thanks for any input,

Tech

[shangdawei1]

Posted on December 04, 2005 at 05:29

i want to know too !

[liyong]

Posted on January 09, 2006 at 02:34

hi:

I use FZ2, but I use another chip --atmega16 to process these protocol : J1850PWM,J1850VPM, KeyWord2000,ISO9141...., if you only use FZ2, I think these will affect the keypad .