USB 2 USB Question

Started by p_dubinsky December 10, 2005
Has anyone tried connecting 2 USB slave(?) devices to each other? I'm
tinkering with a DLP-TXRX RS-232 to USB module with hopes of
converting a product from RS-232 to USB. The problem is if I want to
connect 2 DLP-TXRX's to each other I would need a USB "crossover"
cable (I think). Is there such a thing?

This thingie has a mini-B USB connector on it and since I don't know
much about how USB actually works, I have no idea if these things can
be connected to each other and if so, how.

Here's the data sheet for those who might ne interested.

http://www.dlpdesign.com/usb/dlptxrx-v12-ds.pdf

TIA,
Paul



> ... I want to connect 2 DLP-TXRX's to each other...

It's trivial to do that with RS232 but not at all trivial with USB. One
device or the other must be a host in USB, or you need a hub and host
between the two slaves.

Why abandon RS232? Converting to USB might be necessary if your devices
need to talk with a computer; RS232 ports are all but gone from laptops
already. But if your devices don't need to talk with a machine and need
to talk to each other, I think I'd stay with RS232. Tom



At 05:46 PM 12/10/2005, you wrote:

> > ... I want to connect 2 DLP-TXRX's to each other...
>
>It's trivial to do that with RS232...

I was afraid of that.

><....>


>Why abandon RS232? Converting to USB might be necessary if your devices
>need to talk with a computer; RS232 ports are all but gone from laptops
>already. But if your devices don't need to talk with a machine and need
>to talk to each other, I think I'd stay with RS232.

This product dumps data to assorted devices - sometimes a PC;
sometimes not. It currently uses RS-232 to do the comm. I agree with
you completely. I have no desire to dump RS-232. But I'm getting
requests to support USB for device to PC communications and although
I think that it's trivial to put a decent USB to RS-232 converter on
a laptop, others don't agree.

Thanks for the info. (I get to can the USB project -yeah!)

Paul "I've seen the future, and you're not going to like it."
-- Vincent van Gui



Before you give up on the notion, Jan Axleson has some thoughts on
simultaneous RS232 and USB on a project: http://www.lvr.com/boardusb.htm Tom