This circuit consisted of two transistors one connecting the "ALDL data" to "RS232 Receive", the other connects the "RS232 Send" to "ALDL Ground". It passed the test so the Parallax converter is working, also tried it without the jumper wire between pins 2 and 3 and. Opened up TP and went into the plugin config and used the test cable option. I found one for (normal vehicles) it was like 70. Re: Parallax USB-RS232 converter (DIY ALDL ODB1 cable) I connected pins 2 and 3 together on the Parallax RS232 connector to create a loop back route. The Interface utilizes the popular FTDI chipset that provides the highest compatibility with PC applications. Other newer cars and trucks may work the same. Our '12 Pin ALDL OBD1 USB Interface cable, Mark II' allows for the monitoring and recording of General Motors (GM) vehicle performance data to the user's PC. You can also program the instrument cluster on the 2004, 20 Pontiac GTO with our 16 pin USB ALDL cable as shown with the instrument cluster programming software here. I found lots of them on Ebay BUT they were for Volkswagen and Audi. If you have a 94 or 95 car with the 16 pin connector, we sell 16 pin USB ALDL connector cables for it here. 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. I could not find any on the superchips site. 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.
#USB TO ALDL PRO#
item 4 20W USB-C Power Adapter PD Fast Charge Cable For iPhone 13/12/11 Pro Max/XR/iPad 4 - 20W USB-C Power Adapter PD Fast Charge Cable For iPhone 13/12/11 Pro Max/XR/iPad. GM OBDI 3 - GM OBD1 Scanner Cable & Software - USB to 12 pin ALDL direct. 55.00 shipped to US locationsThis message has been edited by phonedawgz (edited 04-12-2012). Compatible with programs such as TunerPro and TunerPro RT.
#USB TO ALDL DRIVER#
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. item 3 GM OBD1 Scanner Cable & Software - USB to 12 pin ALDL direct. Now Pin M AND Pin E Direct USB to ALDL Compatible with both 160 Baud Pin E and 8192 Baud Pin M protocols Includes CD with driver instructions. 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.