Laptop Logger Cable

[Ravewolf]

Ok, after a few hours of fruitless searching (not finding specifically what I need), I must post a question.

Is there any specific way you must solder the pins for a laptop logger cable, and are the diagrams here correct? Or could someone post an exact diagram just to be sure? I have built two cables so far, neither worked on my car. I am unsure if it's because of the diode selection (was told it did not need to be specific), or if it is the way I have the pins and diode soldered.

Do i need to solder the cathode (?) directly to a pin on the DB9, or can I solder a wire, and then solder a pin? Will the size of the diode affect data transfer?

I have a usb to serial port adapter for my laptop(Gigaware, from Radioshack), and I have the logger cable pins reversed (diode on pin 3). The DB9 connector is female btw.

If anyone needs clarification, I'll attempt to get pics. Thanks for the help in advance.

 

[steve]

The diode needs to be a small signal diode like a 1N4148.
The diagrams and examples I posted in the other thread do work but your USB to Serial adapter might not support the 1G's data rate.

At least one of them from Radio Shack is known not to. usbtoserialadapterinfo [ECMTuning - wiki]

 

[Ravewolf]

The diode needs to be a small signal diode like a 1N4148.
The diagrams and examples I posted in the other thread do work but your USB to Serial adapter might not support the 1G's data rate.

At least one of them from Radio Shack is known not to. usbtoserialadapterinfo [ECMTuning - wiki]

What's the data bit rate needed to support the 1g? I think I may have that cable...mine goes to 128kbps I think.

And I couldn't find a small diode at my local radioshack...so I guess I'll order it.

Like I said, the cable kinda worked with terminal (turned key on, and car responded by flashing a few 0D's), but never logged.

 

[steve]

What's the data bit rate needed to support the 1g? I think I may have that cable...mine goes to 128kbps I think.

, 1953 bits per second. It's not fast, just non-standard. Given that most don't support it I'm expecting the Gigaware adapter doesn't.

And I couldn't find a small diode at my local radioshack...so I guess I'll order it.

RS 276-1122 1N914/1N4148 diodes $1.49 for 10 It's a standard store part.