This circuit consisted of two transistors one connecting the "ALDL data" to "RS232 Receive", the other connects the "RS232 Send" to "ALDL Ground". Since the first circuit performance wasn't great and the whole thing was messy, instead of refining the first circuit i thought i should try a new design. This circuit worked, but for some reason the response was slow, i couldn't make it work with a Usb-to-Serial converter, and on some PCs you can't take power from Pin4 so you have to connect it to 12v external power source (the resistor stays). The simplest ALDL interface circuit i could find consisted of one transistor and two 10k resistors it simply connected the data pin on the ALDL plug to the RxD(Receive Data) port on the RS232 on the PC through the transistor. Īldl has a port for sending data and the RS232 on PC has a receive data pin (RxD) so the easiest way is to connect them directly but since each system uses a different voltage we should put a transistor between them. You can do what I do, use an old desktop computer in my garage with a long cable to reach the car. Autoxray and Actron have these special adapter cables. I've always wanted to connect my laptop to my GMC van OBD1 based ECU, a little research on the internet lead me to a simple circuit that could make that happen. You need an OBD-I scanner with a special adapter cable to fit the OBD-II shaped DLC (not a just a regular OBD-II cable).
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