How to wire two female USB connectors togather

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Discussion Overview

The discussion centers around the wiring of two female USB connectors together, specifically whether to connect corresponding pins directly or to use a crossover method. Participants explore the implications of such wiring, particularly in the context of connecting two computers.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests connecting corresponding pins (pin 1 to pin 1, etc.) for a female-to-female USB connector.
  • Another participant warns that USB connections are master-slave configurations, indicating that connecting two computers directly may lead to issues.
  • There is a suggestion that using Gigabit Ethernet may be a more reliable alternative for connecting two computers.
  • Concerns are raised about potential problems with HID drivers and the risk of system crashes due to improper wiring.
  • A participant mentions that wiring two 5V sources together could cause damage, referencing the risk of "magic smoke."
  • Some participants propose that if the goal is to extend a USB connection, the original wiring diagram should be followed, while also encouraging the poster to share more about their project for better assistance.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and safety of directly connecting two USB devices as proposed. There is no consensus on the best method to achieve the intended connection, with multiple competing perspectives on the implications of such wiring.

Contextual Notes

Participants highlight limitations related to the master-slave nature of USB connections, the potential for driver issues, and the risks associated with connecting power sources. The discussion does not resolve these technical concerns.

Who May Find This Useful

Individuals interested in USB wiring, computer networking, or those seeking alternative methods for file transfer between computers may find this discussion relevant.

John1397
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I want to take two female USB from a computer one will be on top of the other just as they are installed in a computer I want to make a generic type a female to female connector would one connect pin 1 to pin 1 and so on or do the cross over?
 

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The image you attached has it right; connect the same-numbered pins together.
 
What did you plan on using this for?

BoB
 
Gigabit Ethernet is pretty well universal (plus networking software) and that will avoid trying to do things the USB way.
 
@John1397 --

@Svein is correct. HID drivers (kernel mode code) are not going to be happy - an error in driver running in kernel mode can crash and/or freeze the system. Protocol errors are nasty, IMO.

Instead of wiring something that is a guaranteed problem - there are a lot of really bright people here who can help.

Please tell us what you want to do, not how you want to do it.

Thanks!
 
The simplest way to transfer files is the venerable sneakernet - buy an USB stick, copy the files to be transferred over to the stick, walk to the other computer and copy the files from the USB stick.Repeat until done.
 
jim mcnamara said:
HID drivers (kernel mode code) are not going to be happy

Wiring two 5V sources together will not be happy either. You might scare away the magic smoke.

BoB
 
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If you are trying to connect two devices together that act as Master devices, that is with both of them supplying power to the cable, then @rbelli1 is absolutely right; they won't like that at all. There used to be, and maybe still are, cables sold for that purpose with some active components built in. They also came with some supporting software for data transfer.

If you are making a coupler so you can connect two USB cables together for a longer run, then connect as in your original diagram.

What is the project you are working on? If you don't mind divulging the details, someone here may come up with an easier approach.

Cheers,
Tom
 

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