this may be a stupid problem but Im not sure how to get around it. I have purchased a cable to communicate to my 95 trans am the obd1 obd2 cable. i have windows 7 when I plug it in it automatically installs on com 12. I have another cable elm327 that is installed on com 11. Well I have a tune for my car that I need to be able to upload but the software needs to see the cable on com 1-8....first problem...I tried to change it and it sais that com 3-11 in use and 1 2 12+ open. I just changed the com settings to 2 it changed but then I could not see the cable in tuner cat or data master....i have tried to use datamaster a bunch and everytime I try to connect it sais com lost. But it will pull the vin out of the car...and on the self test it sais it detects a pcm so I dont know what to do but I have a madz28 tune to upload and I can not seem to figure out how to make it work.....Thanks

Bryan

 

oh ya its a hp laptop with 4 usb ports on it

 

We have a forum that deals specifically with this kind of problem. I'll move your post there.

 

I am about to EXPLODE!...this is very aggrivating....now I cant get any communication with the car at all... I tried putting the PCM out of my donor can in it...no difference I am about to give up on this crap...I dont understand I got the FT232r cable when I plug it in to the DLC the light goes from red to green I just dont know what to do...I have uninstalled and reinstalled the device and drivers i dont know how many times...I have spent another couple hours in the garage just trying to talk to the car....i dont know

 

I think the device should occupy the lowest number COM port that's available. Ports may be reserved for other/old devices.
Go to http://www.ftdichip.com/Support/Utilities.htm and try the VPClean utility, it frees up com ports.
Also you are using the FTDI VCP (Virtual COM Port) driver right? (from same site, may need to reinstall after VPClean)

 

I am not sure what a virtual com port is exactly....I installed the driver that came with the cable and also what windows finds for the driver

 

Ok I am using it as a virtual com port I just looked it up...I am trying the links to clean up my computer now I will try again tomorrow thanks

Bryan