USB <-> serial, even on same computer

I bought a USB to serial adapter. Before I attempt communicating to
other computers, I shall first practice by communicating to the same
computer, running Debian Linux 2.6. One end I hook to my computer's
USB port, the other end I hook to my computer's serial port. Let's say
I run getty on ttyS0, but then how do I talk to that from the USB
side? minicom? But to what tty number?

$ echo>/dev/ttyUSB0
bash: /dev/ttyUSB0: No such device
But just moments ago, dmesg:
visor ttyUSB0: Handspring Visor / Palm OS converter now disconnected from ttyUSB0

As for what my device is, dmesg says
usb 1-2.1.1: new low speed USB device using address 6
usbcore: registered new driver hiddev
hiddev96: USB HID v1.00 Device [SemiTech Semiconductor USB to Serial] on usb-0000:00:10.0-2.1.1
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
And lsusb says
Bus 001 Device 006: ID 04b4:5500 Cypress Semiconductor Corp. HID->COM RS232 Adapter

I even do mknod /dev/usb/hiddev0 c 180 96
I even do rmmod usbserial; modprobe usbserial vendor=0x04b4 product=0x5500

If I can one day even figure out how to send a single byte over this
connection, then I will even attempt ppp over this connection.

By the way, can one connect two computers via USB? I notice that would
take a female to female adapter. And of course then what are the tty
numbers, etc.?

Dan Jacobson wrote:

> If I can one day even figure out how to send a single byte over this
> connection, then I will even attempt ppp over this connection.
>
FWIW, I recently bought a USB serial port for my notebook. The first one
wouldn't work in either Linux or XP. I tried another model, which I
borrowed from someone at work. It worked fine. I took the one I bought
back to the store and tried a 2nd one. It failed too. Even the store
clerk couldn't get it to work on his computer. Got my money back and
bought a different one elsewhere. That one works fine. So, it's entirely
possible you've got a defective one.

> By the way, can one connect two computers via USB? I notice that would
> take a female to female adapter. And of course then what are the tty
> numbers, etc.?

Why bother, when ethernet is so cheap and easy?

On Tue, 26 Jul 2005 09:29:46 +0800, Dan Jacobson
<(E-Mail Removed)> wrote:
> I bought a USB to serial adapter. Before I attempt communicating to
> other computers, I shall first practice by communicating to the same
> computer, running Debian Linux 2.6. One end I hook to my computer's
> USB port, the other end I hook to my computer's serial port. Let's say
> I run getty on ttyS0, but then how do I talk to that from the USB
> side? minicom? But to what tty number?
>
> $ echo>/dev/ttyUSB0
> bash: /dev/ttyUSB0: No such device
> But just moments ago, dmesg:
> visor ttyUSB0: Handspring Visor / Palm OS converter now disconnected from ttyUSB0
>
Do you have a Palm OS PDA? If so, does it connect to the USB serial adapter,
or directly to the USB port?


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