RS232 vs USB datalogging port with newer Laptop [Archive] - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum:

: RS232 vs USB datalogging port with newer Laptop

03-19-2008, 09:37 PM
I have been researching what I need to be able to run MMCD, Tunerstein, and TMO on my laptop and found most everything goes back to RS232 (DB9).

I am no wiring expert by any means but since I would only be using 3 wires on the DB9 female connector (Data in, Data out, and Ground), I was wondering why I can't use a 4 pin female usb connector like this one: . According to this website: there is a data in, data out, and ground that can be used. That will allow me to connect to my newer laptop (which doesn't have a DB9 connection) using cables I already have laying around the house rather than having to buy a usb to serial cable, install the drivers, etc.


03-20-2008, 05:57 PM
Won't work totally different protocols and data rates.

03-20-2008, 05:59 PM
The more research I do...the more I am finding that to be true.

I know they sell USB to serial cables and have been researching the schematics for the wiring necessary to do this and it seems like a little more than it is worth. I am beginning to think the $35 that RadioShack charges for their cable, might actually be worth it.

03-21-2008, 04:54 PM
$35 sucks. PM me and I can save you some money for one.