Serial to USB Adapter? (DB9F to USB-A F)
TheP|nkPanthe|2
cable, no cradle, and I need serial because i use vmware under linux so i
can get my AvantGo and pocketquicken action on. Unfortunatly for some
reason vmware won't recognize USB palm cradles/cables so I use a serial
cradle with my m515, and all of the adapters i can find are serial device
to usb port, and i need usb device to serial port.
JT
They don't make one. USB Is more general purpose, addressable, and much
faster. And serial is on the way out in most applications. Work on getting
the USB working.
JT
TheP|nkPanthe|2
I have worked on getting the USB working, it simply will not work, USB is
not an option, I guess now I just need help finding the pin diagrams for
USB, I've already got them for serial, I'll just make my own cable if
noone knows where to get one.
Unknown
It's not that simple, USB may have "serial" in the name, but it's
nothing like a "Serial" RS-232 interface. The voltages are different,
the signalling is different, it's a bus (the "B" in USB), there's a
protocol, the bitrates are way different, they are really nothing
alike.
But don't take our word for it, goto http://www.usb.org and look for
yourself.
[You might have better luck with a Palm with a Universal Connector, as
they include serial interfaces...]
--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com
JT
<spamhere@phreaker_DONT_SPAM_.net> wrote:
It's not a matter of Pinouts and connectors. The signals, speeds, voltages,
protocols, drivers, etc.. are completely different. The signal for USB
looks nothing like the older RS232 serial. This adapter would require a
microcontroller/microcomputer to handle all the translation, and the speed
difference would be a killer, requiring memory etc.. Then there custom
driver issues. You would have to write a driver for this device, and
program the microntroller. By the time you completed it, your tungsten E
will be obsolete.
JT
Urs Hunkeler
linux install the USB driver, maybe you can then map the virtual serial
port to a serial port in vmware. The port will only be installed after
you press the hotsync button. You can see the details with the dmesg
command. The device (/dev/ttyUSBxx) should always exist, but you will
only be able to open it once the palm tries to hotsync.
El Senor
> to usb port, and i need usb device to serial port.
USB to serial converters can be made and they are available. However, they
do not always work with every device and, depending on the devices
involved, may need special drivers.
Do a google search for "USB to serial converter."
Here is one:
http://pfranc.com/usb/usb.shtml
and here is another:
http://www.ebusinesscables.com/usb_serial_cable.htm
-Mike
Unknown
>"TheP|nkPanthe|2" wrote:
>> to usb port, and i need usb device to serial port.
>USB to serial converters can be made and they are available.
No, he wants to go the other way around, hook up a USB device to a
computer that only understands serial devices.
JT
wrote:
Great, but the reverse of what he needs. He needs to hook up a USB (T|E)
device to a Serial port on the computer. The two adapters you listed allow
hooking up Serial devices to a USB port on the computer. Will not do the
reverse.
JT
El Senor
> No, he wants to go the other way around, hook up a USB device to a
> computer that only understands serial devices.
Oops! My mistake.
-Mike
TheP|nkPanthe|2
> TheP|nkPanthe|2 <spamhere@phreaker_DONT_SPAM_.net> wrote:
>>I have worked on getting the USB working, it simply will not work, USB is
>>not an option, I guess now I just need help finding the pin diagrams for
>>USB, I've already got them for serial, I'll just make my own cable if
>>noone knows where to get one.
>
> It's not that simple, USB may have "serial" in the name, but it's
> nothing like a "Serial" RS-232 interface. The voltages are different,
> the signalling is different, it's a bus (the "B" in USB), there's a
> protocol, the bitrates are way different, they are really nothing
> alike.
yeah, i know, i've already done a lot of research in the past when i had
this problem, but i just got a serial cradle instead
> But don't take our word for it, goto http://www.usb.org and look for
> yourself.
i've already been there and got the 1.1 PDF's and am going to look into
it, I've got a serial to usb adapter already, maybe if i can disect that i
can figure out how to reverse what it does.
> [You might have better luck with a Palm with a Universal Connector, as
> they include serial interfaces...]
i can't afford one, that's out of the question :(
Unknown
>> It's not that simple, USB may have "serial" in the name, but it's
>> nothing like a "Serial" RS-232 interface. The voltages are different,
>> the signalling is different, it's a bus (the "B" in USB), there's a
>> protocol, the bitrates are way different, they are really nothing
>> alike.
>
>yeah, i know, i've already done a lot of research in the past when i had
>this problem, but i just got a serial cradle instead
Palms with the Universal Connector have serial _AND_ USB interfaces,
so you can use either serial or USB cradles and cables with them. The
T|E has _only_ USB (one of the reasons why it's relatively
inexpensive).
>> But don't take our word for it, goto http://www.usb.org and look for
>> yourself.
>
>i've already been there and got the 1.1 PDF's and am going to look into
>it, I've got a serial to usb adapter already, maybe if i can disect that i
>can figure out how to reverse what it does.
Make sure you note the difference between a USB host device (like your
computer) and a USB slave device (like your Palm, or this USB->Serial
adapter you have). You can't connect two hosts or two slaves
together...
>> [You might have better luck with a Palm with a Universal Connector, as
>> they include serial interfaces...]
>i can't afford one, that's out of the question :(
Well, then, you can't afford the development costs of the USB(Host) to
RS-232 adapter you want either.