Start a Conversation

Unsolved

This post is more than 5 years old

125878

February 9th, 2006 20:00

Motherboard F_USB connector not an USB port

From what I have been able to learn, the F_USB 2x5 connector on the Dimension 5150 motherboard is not a true USB port.  Here's a link that gives the pin-outs http://www.classicflight.co.uk/MotionBase/USBModules.htm
The port is designed to interface with an optional media card reader. I believe the reason Dell refers to it as a USB port is that the signal gets converted by the motherboard circuitry to a USB signal so that the media card reader appears as a USB device to XP.
 
Don't purchase the 5150 with the idea of using the F_USB port to interface with a standard USB device.  I feel that Dell's desciption of the port is particularly misleading since many motherboards do have true 2x5 USB ports.

4 Operator

 • 

34.2K Posts

February 9th, 2006 20:00

It appears you mean the 10-pin connector is not a standard USB header. Ok, how did you reach that conclusion?

7 Posts

February 9th, 2006 21:00

One additional comment, my conclusion is entirely based upon the information about the 2x5 header at http://www.classicflight.co.uk/MotionBase/USBModules.htm
I was directed to this web site by a Dell technician when I asked for information on the pinouts on the Dell Dim 5150 2x5 F_USB header.  If the technician was in error when he directed me to this web site then my conclusions are also incorrect (GIGO).
 
Recent update:  I just received an email from a Dell tech (different one).  He indicated that the information at the web site given by the first technician may not apply to the 5150 motherboard.  He is researching the issue and will report back to me when he has more info.  I will update this post when I hear from him.

Message Edited by REMPacific on 02-09-2006 06:57 PM

7 Posts

February 9th, 2006 21:00

No, that is not what I mean.  Clearly it is not a standard USB header.  I mean that one cannot use any subset of the pins on this header to connect to a USB device.  A standard USB header has 4 pins, +5 VDC, Data -, Data + and Ground (see http://pinouts.ru/data/USB_pinout.shtml).  Based upon a link I was given by one of the Dell technicians (see my original posting) the pins on the 5150 mother board are +5 VDC, IO-1, IO-2, IO-3, ... Ground.  I see no indication that a pair of the IO pins can be used as D- and D+.  In fact, based upon the web site I mentioned they use a fair amount of circuity to convert the signal received by the header to a USB signal.
 
A number of manufacturers sell motherboards with either 2x4 or 2x5 USB headers.  Such headers are configured so that a subset of 4 pins can be used to obtain +5, D-, D+ and Grnd.  There are also vendors who sell USB external ports that are designed to connect to these headers.  I'm saying that one cannot use the 5150 in this manner no matter what configuration of the pins one selects.  The motherboard's circuitry simply is not designed for this purpose.

4 Operator

 • 

34.2K Posts

February 9th, 2006 22:00

Sorry, but you're not making the point you claim to have made.

381 Posts

February 9th, 2006 22:00

He made the point to me.  This is very valuable information because I was intending to install a media reader into my daughter's E510 on Saturday.  I had looked at the service manual online and it listed a F_USB 2x5 which is usually a USB header on other motherboards.
TKS
David
 

7 Posts

February 9th, 2006 23:00

I see no reason why you cannot do as you plan provided it is the Dell media card reader that is designed for this port.  I would not advise that you try to install a different media card reader that expects to be connected to a standard USB connector.  Also, please see my edit to my previous post.  Dell is working on trying to clarify just what the 5150 F_USB header is and is not.

381 Posts

February 10th, 2006 04:00

I couldn't find a Dell media reader.  This is another brand.  That is why what you are finding out is important to me.

David

16 Posts

April 18th, 2006 02:00

Has there been any further clarification on this question?

7 Posts

April 18th, 2006 14:00

No, I never was able to obtain the pinouts from Dell.  Dell told me to contact Intel which I did and Intel then directed me back to Dell.  Same thing happened when Dell put me in touch with the folks who make the media card reader for Dell.  I also tried using a multimeter to determine the pinouts myself but I was never able to pin it down and finally gave up.  As I indicated in my original post, I feel that it is very misleading for Dell to advertise this as a USB port.  They should only advertise it as a media card reader port unless they can provide information on how to use it as a USB port.

7 Posts

June 6th, 2006 20:00

I was told that TEAC made the device.

2 Posts

June 6th, 2006 20:00



@REMPacific wrote:
No, I never was able to obtain the pinouts from Dell. Dell told me to contact Intel which I did and Intel then directed me back to Dell. Same thing happened when Dell put me in touch with the folks who make the media card reader for Dell. I also tried using a multimeter to determine the pinouts myself but I was never able to pin it down and finally gave up. As I indicated in my original post, I feel that it is very misleading for Dell to advertise this as a USB port. They should only advertise it as a media card reader port unless they can provide information on how to use it as a USB port.




What company makes the media reader?

Thanks,
D.

13 Posts

July 5th, 2006 14:00

The original link does not work for the pinouts.  Is there an update?

18 Posts

September 1st, 2006 02:00

I ran into the same problem. I just spent a good 1/2 hour chatting with dell tech support about it. They insisted their connector is standard, when of course it is not. Another post on this forum explains that the dell connector is non-standard:

http://forums.us.dell.com/supportforums/board/message?board.id=dim_other&message.id=283157&query.id=40261#M283157

The card reader I bought receieved 51 reviews on newegg, none of which mentioned it having a non-standard connector. So I guess the only way to get one that will work is to get it from Dell. That's the kind of manipulative businbess practice I expect from Apple, not Dell. But the trouble is the Dell website lists no card readers that are compatable with the 5150. I'll call Dell sales tomorrow and see if they have any suggestions, but based on the poor level of knowlege I have experienced from dell sales in the past, I don't think I can necessarily trust their recommendation. Dell sales has already once before recommeded an accessory that was incompatable with my system. And after I shipped it back they never credited the return.

rant--> You wonder why people are complaining about dell? Even the analysts on wall street are taking notice.

Can anyone recommed an internal card reader that will work on the 5150?

6 Posts

September 16th, 2006 11:00

I have just bought a new card reader not Dell. The connector has a blanked out pin in a different place to my 5150 o will not even plug in so I guess the Dell socket is not standard f-usb.

1 Message

January 17th, 2007 00:00

Ok so I just purchased a non dell media card reader for my dimension 5100. I did my research on the matter but didn't think that the F_USB was different than the standard USB ports used on  most motherboards. I am now stuck with a reader that won't work with my system. To top it all off I work for dell tech support. I had a question is there any  way to re-wire my reader to fit in to the F_USB? I am going to talk with some of the other techs and will be back if I learn anything new.
No Events found!

Top