Hi, I've searched around the Forum for quite a while, but I hadn't been able to find an answer, so here I am asking for help please. I'm a newbie.

EFILive Eval Version, Win98, laptop pc c/w serial port

Question: Is there a schematic available to make an interface between OBD-1 and a standard RS232 port?

I understand a MAX232 is involved, that's OK, but I'm not completely understanding a loopback function going on that's required by EFILive, otherwise I would use this interface as a basis: http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm

I can see from the above circuit a loopback going on at pin 'M'

Is this circuit suitable ?

Or should I really ought to be trying to buy this hardware from EFILive online store? :-)