Thread: RRTMS - RoadRunner tire monitoring system extension plugin

Originally Posted by mnwcsult

I get "unknow device" on one of my computers the car computer. I have tried this device on three computers and on two them it works. I have tried thorugh direct connection and thourgh hubs.

Does the device work differently through USB 1.1 and USB 2.0 devices? My guess is ??? I would not think that it would work through multiple hubs. In my setup there are two chained hubs to the front of the car. There are direct connection at the back of the computer.

On the direct connection at the back of the computer I think those are USB 1.1.

Any ideals?

My carputer is a VoomPC II with front and back panel USB hubs. The front panel hubs are diasy chained to external Logitech premium 4 port hubs. The back panel hub is not in use (I thought).

Note: The Logitech Premiums are way cool black in color with green indicator lights showing at a glance active USB devices.

I had to go into control panel and look the power requirements of each of the hubs on the system. It turned out that my rear panel hub which would allow for a direct connection is actually "hosting" the Sierra Aircard in the nearby pcmcia slot as a USB device and it it drawing the full 500 ma.

Solution was to provide additional power to the external hubs. Once I did that the TPMS device activitated and was recognized properly by XP and the TPMS Doctor program.

Exact steps

Start Control Panel -> Device Manager -> Universal Serial Bus

You will see many entries, here you are interested in only the ones that specifically say "HUB", i.e. "Generic USB hub" or "USB root hub". Right click on first one and select properties. On the property panel you will see the "Power Tab". You will see Total amount of power available to each port on the hub. Also what is connected, power requirements of the connections, and finally number of ports still available. Repeat for each hub you have installed.

-Michael