Thought I would share this. I just went USB with my ALDL cable trying to figure out some logging problems I was having.
I ordered up one of these:
http://www.superdroidrobots.com/shop/it ... temid=1173
Tied TX/RX (1&2 connections) to the ALDL signal and ground (5 connection).
Download the drivers from the FTDI site:
http://www.ftdichip.com/Drivers/VCP.htm
Install them before you plug it in. Plug it in. Change TP to whatever com port it installed at.
Now as a disclaimer:
I have not tried this with any ECU other than the one I have for my 93 LT1 (16159278). It is an 8192 baud ECU and it worked right out of the box. When I get a chance I am going to test it out on a friend's truck that has a 160 baud TBI ECU (1227747).
Low cost USB ALDL cable
Moderators: Mangus, robertisaar, dex
-
- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
The sample rate is bouncing around between about 8.3 and 10. Is it supposed to do that or remain steady? It did that with my previous serial cable too. The stream is nice and clean.
With this cable I was able to reduce the wait for silence in my monitor command down to 7ms. Any lower and there are a lot of glitches. With my serial cable the best I could do was 14ms. So it seems to work a little better.
With this cable I was able to reduce the wait for silence in my monitor command down to 7ms. Any lower and there are a lot of glitches. With my serial cable the best I could do was 14ms. So it seems to work a little better.
-
- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
AFAIK, the "bouncing" is normal, it's done that with all of my cables....
was your serial cable based on a 2 transistor design, or MAX232? i've found that the 2 transistor needs a lot more pause time than a MAX232 design. i currently don't run any type of pause with my MAX232 converted to USB via a Parallax 28030, but when i had my 2 transistor, i had around ~20mS pauses and still had errors...
was your serial cable based on a 2 transistor design, or MAX232? i've found that the 2 transistor needs a lot more pause time than a MAX232 design. i currently don't run any type of pause with my MAX232 converted to USB via a Parallax 28030, but when i had my 2 transistor, i had around ~20mS pauses and still had errors...
Another small update to this. I found some settings in device manager for the drivers for this USB converter. Under advanced there is a setting for latency. By default it was set at 16. I changed it to 1 and was able to completly remove the wait for silence pause in my monitor macro.
Sampling frequency now bounces between 9.5 and 11.8.
Sampling frequency now bounces between 9.5 and 11.8.
-
- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI