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'[EE] PC Serial Port'
2007\01\18@093615 by John Pfaff

picon face
I've looked all over, and can't find the answer on my own, so I'm asking
the smartest bunch of people I know.
I'm using Windows XP, and can't use one of the serial ports.  I'm trying
to install a drawing tablet that uses the serial port, but now matter
what I try (Hyper Terminal, Tera Term, PortMon, other programs that use
the serial port), nothing can use it.  The error message I get says that
something else is using the telephony device.  Is there any way I can
tell what process is using the serial port?  I've tried Googling.  About
the closest thing I've found is a Microsoft utility called PortMon, but
even that can't attach to the serial port and won't/can't tell me what
is using it.
I don't know if the serial port has ever worked properly on this PC.
I've checked BIOS settings for the port.  Is there any possibility that
Norton Internet Security is doing something?

Thanks,
John Pfaff

2007\01\18@095418 by PAUL James

picon face

John,

Do you have a modem installed?  If so, that may be the culprit using
that port.
Have you tried switching to a different port?

       
Regards,

       
Jim

{Original Message removed}

2007\01\18@095944 by Dario Greggio

face picon face
John Pfaff wrote:

> I'm using Windows XP, and can't use one of the serial ports.  

Hi John, if you're using a Drawing Tablet, then it probably should have
its own driver, which "captures" the serial port and won't let you use
it from another program.
To see traffic flowing through COM port, you should unload/disable the
driver. Actually, I'm not sure you'd see anything... at times the
protocol is kind of hidden and parameters may not be clear.

If you need to test the Port because you feel it's broken, then
definitely uninstall Tablet Driver, and use Hyperterminal to do some tests.


--
Ciao, Dario

2007\01\18@100445 by Richard Prosser

picon face
Have you tried running in safe mode?
Normally if this happens to me I just restart  and it comes right.
Have you tried looking at device manager and disabling the port and
seeing if anything objects?
RP

On 18/01/07, John Pfaff <spam_OUTjpfaff1528TakeThisOuTspamverizon.net> wrote:
{Quote hidden}

> -

2007\01\18@102610 by Mauricio Giovagnini

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face

-------------------------------------------------------
----- Mensaje original ----
De: John Pfaff <.....jpfaff1528KILLspamspam@spam@verizon.net>
Para: piclistspamKILLspammit.edu
Enviado: jueves 18 de enero de 2007, 11:36:09
Asunto: [EE] PC Serial Port

I've looked all over, and can't find the answer on my own, so I'm asking
the smartest bunch of people I know.
I'm using Windows XP, and can't use one of the serial ports.  I'm trying
to install a drawing tablet that uses the serial port, but now matter
what I try (Hyper Terminal, Tera Term, PortMon, other programs that use
the serial port), nothing can use it.  The error message I get says that
something else is using the telephony device.  Is there any way I can
tell what process is using the serial port?  I've tried Googling.  About
the closest thing I've found is a Microsoft utility called PortMon, but
even that can't attach to the serial port and won't/can't tell me what
is using it.
I don't know if the serial port has ever worked properly on this PC.
I've checked BIOS settings for the port.  Is there any possibility that
Norton Internet Security is doing something?

Thanks,
John Pfaff


-------------------------------------------------------

John new PC's often have only one serial port.  the second its may be an infrared port or a modem port used by some application.

PortMon is now a Microsoft Tool but some months ago the application was on Mark Russinovich site http://www.sysinternals.com (now hired by Microsoft).  

I've used PortMon and if the program doesn't let you attach to the serial port, its because its previously opened by another application.  

That second serial port could also be some USB-RS232 converter of a Palm or similar device.






       

       
               
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2007\01\18@102751 by John Pfaff

picon face
I have a modem installed, but it's internal and uses COM3.
I haven't been able to install the tablet driver, because it tells me
that COM1 is not available.
Other programs (Hypter Terminal, Tera Term) tell me COM1 and COM3 are
available (the only two ports on the system), but can't use either one
because the "telephony device is in use".
What I'm really looking for is a way to tell what process has the serial
port locked.

Dario Greggio wrote:
{Quote hidden}

2007\01\18@103035 by John Pfaff

picon face
I haven't tried safe mode yet.  That will probably let me use it, but
will I be able to figure out what is using it when it's not in safe mode?
I have tried disabling the port in device manager, but nothing complained.
I also tried installing another serial port, a USB device that became
COM4.  I couldn't believe it when I tried to open COM4 with Hyper
Terminal, it gave me the same error message (telephony device is in use).

Richard Prosser wrote:
{Quote hidden}

>> --

2007\01\18@104939 by Tamas Rudnai

face picon face
You may have a dialer hiding on your computer -- Normally it should be
detected by Norton Internet Security if you have the latest virus database,
however, it can be also a very new one.

Tamas



On 1/18/07, John Pfaff <EraseMEjpfaff1528spam_OUTspamTakeThisOuTverizon.net> wrote:
{Quote hidden}

2007\01\18@105234 by Tony Smith

picon face
> I've looked all over, and can't find the answer on my own, so
> I'm asking the smartest bunch of people I know.
> I'm using Windows XP, and can't use one of the serial ports.  
> I'm trying to install a drawing tablet that uses the serial
> port, but now matter what I try (Hyper Terminal, Tera Term,
> PortMon, other programs that use the serial port), nothing
> can use it.  The error message I get says that something else
> is using the telephony device.  Is there any way I can tell
> what process is using the serial port?  I've tried Googling.  
> About the closest thing I've found is a Microsoft utility
> called PortMon, but even that can't attach to the serial port
> and won't/can't tell me what is using it.
> I don't know if the serial port has ever worked properly on this PC.
> I've checked BIOS settings for the port.  Is there any
> possibility that Norton Internet Security is doing something?
>
> Thanks,
> John Pfaff


Check under device manager to see if you even have a serial port.  Disable
the port, reboot and see if anything complains.  Or delete it and let
Windows fix it up.

Could be an application like Nero, Quicktime etc trying to connect to the
net to 'check for upgrades' or whatever the hell it is that they do.
Occasionally you get a dumb one that tries to fire up the dial-up
connection.  I had this happen a few weeks ago.  The dial-up connection
dialog remained hidden, so it was bit hard to figure out.  (This person used
dial-up to connect to the net, so that aws broken.)

I used MSCONFIG to disable anything under StartUp that I didn't like.

Tony

2007\01\18@112548 by Tamas Rudnai

face picon face
John,

NTFiles can tell you who is opened the port by looking at the file
\DEVICE\SERIALx - x is the port number

http://www.smidgeonsoft.prohosting.com/ntfiles-file-lister.html

Hope it helps
Tamas





On 1/18/07, Tamas Rudnai <@spam@tamas.rudnaiKILLspamspamgmail.com> wrote:
{Quote hidden}

>

2007\01\18@115617 by John Pfaff

picon face
Looks like this might be it.  I'll find out when I try it tonight.

Thanks everyone.  Hopefully this one will do what I want.  I'll let you
know what I find out.

Tamas Rudnai wrote:
{Quote hidden}

>

2007\01\18@121304 by Mark Rages

face picon face
On 1/18/07, John Pfaff <jpfaff1528EraseMEspam.....verizon.net> wrote:
> Looks like this might be it.  I'll find out when I try it tonight.
>
> Thanks everyone.  Hopefully this one will do what I want.  I'll let you
> know what I find out.
>

You might want to look in the BIOS to make sure the serial port is enabled.

Regards,
Mark
markrages@gmail
--
You think that it is a secret, but it never has been one.
 - fortune cookie

2007\01\18@124019 by Alan B. Pearce

face picon face
>I haven't been able to install the tablet driver,
>because it tells me that COM1 is not available.

Do you have the tablet connected? If so it sounds like XP thinks it is a
mouse, as it has probably sent a data string to the port when powered up,
which XP detects and figures a mouse is present.

Because it is a tablet it may also be deliberately trying to look like
aerial mouse, so it works without the driver.

2007\01\18@125200 by Carl Denk

flavicon
face
Most tablest have their own driver, since in general they are low
production things that don't warrant a built in windows driver, check
with the manufacturer. This is something the Autocad community is well
aware of, might look there.

Tony Smith wrote:
{Quote hidden}

2007\01\18@131401 by John Pfaff

picon face
I haven't installed the Wacom driver (not for lack of trying), or
connected the tablet.  The setup program won't install the driver
because the serial port is in use.  My problem is determining what has
the serial port locked up and freeing it.

Carl Denk wrote:
{Quote hidden}

2007\01\18@131542 by Mauricio Giovagnini

flavicon
face
Sounds reasonable.  

Perhaps it will be wise that the OP tries to open the serial ports without attaching the Tablet to it in order to probe this, otherwise if its windows the one that its using the tablet NtFiles won't show any useful information because it will indicate that the OS is using it... and when the OS is using it it can be a virus or trojan hijack too...

----- Mensaje original ----
De: Alan B. Pearce <EraseMEA.B.Pearcespamrl.ac.uk>
Para: Microcontroller discussion list - Public. <RemoveMEpiclistEraseMEspamEraseMEmit.edu>
Enviado: jueves 18 de enero de 2007, 14:39:27
Asunto: Re: [EE] PC Serial Port

>I haven't been able to install the tablet driver,
>because it tells me that COM1 is not available.

Do you have the tablet connected? If so it sounds like XP thinks it is a
mouse, as it has probably sent a data string to the port when powered up,
which XP detects and figures a mouse is present.

Because it is a tablet it may also be deliberately trying to look like
aerial mouse, so it works without the driver.

2007\01\18@143947 by Bob Axtell

face picon face
John Pfaff wrote:
> I have a modem installed, but it's internal and uses COM3.
> I haven't been able to install the tablet driver, because it tells me
> that COM1 is not available.
> Other programs (Hypter Terminal, Tera Term) tell me COM1 and COM3 are
> available (the only two ports on the system), but can't use either one
> because the "telephony device is in use".
> What I'm really looking for is a way to tell what process has the serial
> port locked.
>
>  
COM1 and COM3 share the safe interrupt port. So when COM3 is used, COM1
is used as well.

--Bob


{Quote hidden}

2007\01\18@145615 by Mauricio Giovagnini

flavicon
face
NTFiles let you do a search.  Perhaps doing a search looking for "Serial" will show you the information that you need.



----- Mensaje original ----
De: John Pfaff <RemoveMEjpfaff1528spam_OUTspamKILLspamverizon.net>
Para: Microcontroller discussion list - Public. <RemoveMEpiclistTakeThisOuTspamspammit.edu>
Enviado: jueves 18 de enero de 2007, 15:13:49
Asunto: Re: [EE] PC Serial Port

I haven't installed the Wacom driver (not for lack of trying), or
connected the tablet.  The setup program won't install the driver
because the serial port is in use.  My problem is determining what has
the serial port locked up and freeing it.

Carl Denk wrote:
{Quote hidden}

2007\01\18@153021 by John Pfaff

picon face
Not necessarily.  They're separate resources as far as Windows is
concerned.  In the past I've had no problem writing software for Windows
XP that uses COM1 and COM3 simultaneously.
Plus, when I added a COM4, it came up as being used as well.  Something
is using the COM ports, and for the life of me I can't find out what it is.

Bob Axtell wrote:
{Quote hidden}

2007\01\18@153148 by Herbert Graf

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face
On Thu, 2007-01-18 at 12:40 -0700, Bob Axtell wrote:
> John Pfaff wrote:
> > I have a modem installed, but it's internal and uses COM3.
> > I haven't been able to install the tablet driver, because it tells me
> > that COM1 is not available.
> > Other programs (Hypter Terminal, Tera Term) tell me COM1 and COM3 are
> > available (the only two ports on the system), but can't use either one
> > because the "telephony device is in use".
> > What I'm really looking for is a way to tell what process has the serial
> > port locked.
> >
> >  
> COM1 and COM3 share the safe interrupt port. So when COM3 is used, COM1
> is used as well.

Before the days of PCI and interrupt sharing that was true.

However, assuming the com ports are PCI devices (whether physically in a
PCI slot, or simply virtually hanging off the PCI bus in the form of
being built in to the south bridge), Windows should have zero problems
with them sharing the same IRQ.

TTYL

2007\01\18@155924 by Mauricio Giovagnini

flavicon
face
That's it.  Interrupt sharing is not a problem on new OSes since a long time!

Windows 2000/XP an Linux starting from kernel 2.2 (as I remember)



----- Mensaje original ----
De: Herbert Graf <EraseMEmailinglist3spamspamspamBeGonefarcite.net>
Para: Microcontroller discussion list - Public. <RemoveMEpiclistKILLspamspammit.edu>
Enviado: jueves 18 de enero de 2007, 17:31:45
Asunto: Re: [EE] PC Serial Port

On Thu, 2007-01-18 at 12:40 -0700, Bob Axtell wrote:
{Quote hidden}

Before the days of PCI and interrupt sharing that was true.

However, assuming the com ports are PCI devices (whether physically in a
PCI slot, or simply virtually hanging off the PCI bus in the form of
being built in to the south bridge), Windows should have zero problems
with them sharing the same IRQ.

TTYL

2007\01\18@164005 by Paul Hutchinson

picon face
Before you spend too much time trying to get the serial port working, have a
look at the release notes for your particular Wacom tablets XP driver.

A couple months ago I went through the hassle of getting a serial port
installed on a new PC for an old Wacom tablet. Then I discovered that my old
serial Wacom tablet is not supported under Win XP SP2, it was in the release
notes, that I hadn't read, doh. Had to swap it with the USB tablet on my
Win2K PC (the Win2K Wacom driver did work with my serial tablet).

Paul  

> {Original Message removed}

2007\01\18@173505 by Bob Axtell

face picon face
Thanks for the info!

er... tells you how old i am doesn't it...

--Bob

Mauricio Giovagnini wrote:
{Quote hidden}

2007\01\18@175110 by John Pfaff

picon face
I'm using the tablet on another PC, one that doesn't have this serial
port problem.

Paul Hutchinson wrote:
{Quote hidden}

>> {Original Message removed}

2007\01\18@182329 by Mauricio Giovagnini

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face
Bob Axtell escribió:
> Thanks for the info!
>
> er... tells you how old i am doesn't it...
>
> --Bob
>
> Mauricio Giovagnini wrote:
>  
>> That's it.  Interrupt sharing is not a problem on new OSes since a long time!
>>
>> Windows 2000/XP an Linux starting from kernel 2.2 (as I remember)
Well I don't know how old are you, but I'm not that old.......  Im from
the seventies... :)


       

       
               
__________________________________________________
Preguntá. Respondé. Descubrí.
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está en Yahoo! Respuestas (Beta).
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http://www.yahoo.com.ar/respuestas

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