I want to communicate to a vehicle ecu with a pic via rs232.
Using a ELM327 protocol converter ic designed for the job this is a simple task, to get basic data anyway.
You used to be able to get a cable that contained a obd diagnostics connector, a elm327 chip and a d9 on the other end, but nowadays you can only get them with a ft232 rs232 to usb converter chip as well and a usb connector, due to the fact most slaptops dont have a serial port.
I was wondering on the feasibility of hacking my usb to obd interface and bringing out the rx,tx,dtr and cts lines from the ft232 (I know its an ft232 inside the interface as windows 7 tells me it is).
I have a pic programmer that is rs232 or usb, there are links you position for rs232 or usb, I suspect the links just connect the tx and rx from the ft232 chip (it has one too) to the rs232 connections on the on board pic controlling everything.
Using a ELM327 protocol converter ic designed for the job this is a simple task, to get basic data anyway.
You used to be able to get a cable that contained a obd diagnostics connector, a elm327 chip and a d9 on the other end, but nowadays you can only get them with a ft232 rs232 to usb converter chip as well and a usb connector, due to the fact most slaptops dont have a serial port.
I was wondering on the feasibility of hacking my usb to obd interface and bringing out the rx,tx,dtr and cts lines from the ft232 (I know its an ft232 inside the interface as windows 7 tells me it is).
I have a pic programmer that is rs232 or usb, there are links you position for rs232 or usb, I suspect the links just connect the tx and rx from the ft232 chip (it has one too) to the rs232 connections on the on board pic controlling everything.