[Gmecm] Cable question from newbie..

[Anders Lindqvist]

Hi Brian.
I?m new at this too, but i checked the instructions on some websites, and 
made my own cable. It?s not too hard.
The thing is, and i qoute: "The ECM produces the data signal at either a 12 
Volt or 5 volt level that must be inverted and converted to RS232. One 
simple scheme is to feed the ALDL data into a single transistor level 
converter that inverts the data to produce a pseudo RS232 level (varies 
between 12 Volts and 0). This is connected to the receive data line of a 
serial port to be processed by the PC's UART."
On some computers it is possible to use the DTR pin on the serial port as 12 
Volt source, but since i think my cable will
outlast my laptop, I made mine with the cigarette power, and it works great.
Total cost: $10

Building instructions at: 
http://web.telia.com/~u60113744/software/winaldl/winaldl.htm
Great monitoring prog there as well.
Made in Sweden of course :-)