Re: Issue with RS232 <-> USB adaptor (FC15)

[f8arr <f8arr@xxxxxxxxx>]

Hello My answers inside the email. (Thank you for your reply ;-) )



On 06/13/2011 09:40 PM, Dave Platt wrote:
> On 06/13/2011 12:24 PM, f8arr wrote:
> > Hello Hams !
> >
> > Apologies for the bandwich, but perhaps someone has allready faced it ...
> >
> >
> > Here is the case :
> > In order to have a TX port on WSJT I use /dev/ttyUSB0 from prolific pl2303.
> > At boot, the serial comes up to TX.
> I'm not certain what you mean here.  Does this mean that the
> transmitter is keyed up into TX, as soon as the system boots
> and the USB serial port adapter is recognized by the kernel?

YES

> If so, this would suggest one of several things:
>
> -  Your PL2303 adapter is asserting either DTR or RTS
>     when it is first initialized, without waiting for some
>     program to open the USB serial port.

you are right

>     [Question - which of these lines are you using to drive
>      PTT on your transmitter?]
I'm using DTR

> -  Some (unexpected) program is opening /dev/ttyUSB0 as soon
>     as the adapter is connected.
may be.. but witch one ?? grrr


> > On messages I have only this message :
> >
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.706035] usb 3-1: new full
> > speed USB device using uhci_hcd and address 8
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.852805] usb 3-1: New USB
> > device found, idVendor=067b, idProduct=2303
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.852814] usb 3-1: New USB
> > device strings: Mfr=1, Product=2, SerialNumber=0
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.852819] usb 3-1: Product:
> > USB-Serial Controller
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.852823] usb 3-1:
> > Manufacturer: Prolific Technology Inc.
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.855943] pl2303 3-1:1.0:
> > pl2303 converter detected
> > Jun 13 17:00:08 f8arr2-station kernel: [ 3574.868109] usb 3-1: pl2303
> > converter now attached to ttyUSB0
>
> > Of course, If I run WSJT it can't commute the TX with an error message
> > "Can't connect to /dev/ttyUSB0"
> That suggests that either the permissions are wrong, or that some
> other program/process has already opened the serial port for
> some reason.

I think that is due to program blocking. Because if I do some 
manipulations with my only real RS232 serial it is working like a charm.
This is due to RS232<->USB (driver?)

> > My user is on the "dialout" and "uucp" group.
> When the system is in this state, try the following:
>
> 	ls -l /dev/ttyUSB0
> 	lsof | grep ttyUSB0
>
> The output for the first command will show you what
> owner/group information was set up for the port during
> the hot-plugging.

crw-rw-rw-. 1 root uucp 188, 0 Jun 13 21:15 /dev/ttyUSB0

(My user is under uucp group)
uucp:x:14:uucp,f8arr
dialout:x:18:f8arr
f8arr:x:500:

> The output for the second command should help you see
> whether there's another program "busying out" the
> USB serial port.
nothing...




> > I tried exactly the same manipulation with my only real RS232 port and
> > it works like a charm.. (but dedicated to an other action).
> > Of course, same configuration was ok under my ubuntu 10.04. but I
> > switched to Fedora 15...
> That suggests that the adapter itself is OK, and that it's either
> an issue of permissions for the port (which would be set via
> a configuration file in /etc/udev/), or an issue of some other
> program opening the port (maybe something looking for a serial
> mouse or a modem?)
 I had this in udev rules :

SUBSYSTEM=="usb", SYSFS{idVendor}=="067b", MODE="0666"

with lsusb :

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0603:00f2 Novatek Microelectronics Corp.
Bus 002 Device 003: ID 046d:c404 Logitech, Inc. TrackMan Wheel
Bus 003 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial 
Port
Bus 003 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial 
Port

(I have two usb to RS232 adpaters.)



Thaks for help !

Guillaume



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