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-   -   RS232-to-USB adapter with dial-up modem (http://www.linux-archive.org/debian-user/428282-rs232-usb-adapter-dial-up-modem.html)

John Hasler 09-17-2010 12:42 PM

RS232-to-USB adapter with dial-up modem
 
S D writes:
> I bought a RS-232 to USB adapter cable. It's a simple inexpensive
> cable that doesn't seem to have any chips/processors in it.

It does, though. They've failed to implement enough of the modem
control lines and/or gotten the voltages wrong. This is quite common.

> Any ideas?

Throw it away. Do a Google search and buy one that is known to work.
--
John Hasler


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Chris Bannister 09-17-2010 01:41 PM

RS232-to-USB adapter with dial-up modem
 
On Fri, Sep 17, 2010 at 08:01:03AM +0000, Camaleón wrote:
> On Fri, 17 Sep 2010 00:42:26 -0700, S D wrote:
>
> > I have a RS-232 external dial-up modem that I use from time to time. It
> > works fine when connected through a RS-232 port. I'd like to use the
> > modem with another PC that doesn't have a RS-232 port, so I bought a
> > RS-232 to USB adapter cable. It's a simple inexpensive cable that
> > doesn't seem to have any chips/processors in it.
> >
> > Now, when I connect the modem through a USB port I can't get the modem
> > to work. It doesn't even attempt to dial the number:
>
> (...)
>
> Device is detected at "/dev/ttyUSB0".
>
> Have you tried to communicate with the modem using low-level tools, such
> "minicom"?

Or:
less /etc/ppp/peers/provider | grep dev

mine shows:
# Serial device to which the modem is connected.
/dev/ttyS0

Of course, I'm using the RS-232 port here.

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> <snip>
>
>> At least this new x64 flashplugin is more stable than the 32bit one
>> under nsplugins, thats all I ask of the stupid thing.
>>
>> Works fine with chrome v7-dev/ff3.6.9 both x64, still pegs a core or so
>> playing videos, sigh!
>>
> Any idea when it will make it into the multimedia repository? - John
>
>
>

Why the multimedia repository? The standard repository doesn't have the
flashplugin-nonfree ?



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--------------ms020306020208040809060806--


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S D 09-17-2010 08:28 PM

RS232-to-USB adapter with dial-up modem
 
--- On Fri, 9/17/10, Camaleón <noelamac@gmail.com> wrote:

> > --- On Fri, 9/17/10, Camaleón wrote:
> >>
> >> Device is detected at "/dev/ttyUSB0".
> >>
> >> Have you tried to communicate with the modem using
> low-level tools,
> >> such
> >> "minicom"?
> >
> > No. Anything in particular I should try? Thanks
>
> Nonthing special. Well, just that you can establish a
> dialog with your
> modem by sending AT commands and even place calls. And
> minicom is perfect
> for that :-)


Here's a couple of other things I tried. I replaced
/dev/ttyS0
with
/dev/ttyUSB0
in /etc/ppp/peers/provider.

Still getting "Connect script failed" error:

# cat /va/log/syslog
...
Sep 17 16:13:31 testbox kernel: [411973.168035] usb 1-8: new full speed USB device using ohci_hcd and address 6
Sep 17 16:13:32 testbox kernel: [411973.372001] usb 1-8: configuration #1 chosen from 1 choice
Sep 17 16:13:32 testbox kernel: [411973.381064] ch341 1-8:1.0: ch341-uart converter detected
Sep 17 16:13:32 testbox kernel: [411973.417070] usb 1-8: ch341-uart converter now attached to ttyUSB0
Sep 17 16:13:32 testbox kernel: [411973.417217] usb 1-8: New USB device found, idVendor=1a86, idProduct=7523
Sep 17 16:13:32 testbox kernel: [411973.417220] usb 1-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
Sep 17 16:13:32 testbox kernel: [411973.417223] usb 1-8: Product: USB2.0-Serial
Sep 17 16:15:04 testbox pppd[4244]: pppd 2.4.4 started by luser, uid 2000
Sep 17 16:15:05 testbox chat[4245]: abort on (BUSY)
Sep 17 16:15:05 testbox chat[4245]: abort on (NO CARRIER)
Sep 17 16:15:05 testbox chat[4245]: abort on (VOICE)
Sep 17 16:15:05 testbox chat[4245]: abort on (NO DIALTONE)
Sep 17 16:15:05 testbox chat[4245]: send (ATZW2^M)
Sep 17 16:15:05 testbox chat[4245]: expect (OK)
Sep 17 16:15:50 testbox chat[4245]: alarm
Sep 17 16:15:50 testbox chat[4245]: Failed
Sep 17 16:15:50 testbox pppd[4244]: Connect script failed
Sep 17 16:15:51 testbox pppd[4244]: Exit.


Tried minicom. Minicom doesn't seem to allow me to type any commands and seemingly responds only to "Ctrl A Z". Here's what I see when minicom starts.

Welcome to minicom 2.3

OPTIONS: I18n
Compiled on Feb 24 2008, 16:35:15.
Port /dev/ttyUSB0

Press CTRL-A Z for help on special keys


Any ideas? Thanks





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Phil Requirements 09-17-2010 10:23 PM

RS232-to-USB adapter with dial-up modem
 
On 2010-09-17 13:28:52 -0700, S D wrote:
> On Fri, 9/17/10, Camaleón <noelamac@gmail.com> wrote:
> > On ???, SD wrote:
> > >
> > > On Fri, 9/17/10, Camaleón wrote:
> > > >
> > > > Device is detected at "/dev/ttyUSB0".
> > > >
> > > > Have you tried to communicate with the modem using
> > > > low-level tools, such "minicom"?
> > >
> > > No. Anything in particular I should try? Thanks
> >
> > Nonthing special. Well, just that you can establish a dialog with
> > your modem by sending AT commands and even place calls. And
> > minicom is perfect for that :-)
>
> Here's a couple of other things I tried. I replaced
> /dev/ttyS0
> with
> /dev/ttyUSB0
> in /etc/ppp/peers/provider.
>
> Still getting "Connect script failed" error:
>
> Tried minicom. Minicom doesn't seem to allow me to type any commands
> and seemingly responds only to "Ctrl A Z". Here's what I see when
> minicom starts.
>
> Welcome to minicom 2.3
>
> OPTIONS: I18n
> Compiled on Feb 24 2008, 16:35:15.
> Port /dev/ttyUSB0
>
> Press CTRL-A Z for help on special keys
>
> Any ideas? Thanks
>

What are you using to try to dial out?

I always used wvdial. What I would suggest, if you haven't tried it,
is to install wvdial. As part of the installation, it will try to
detect and configure the modem.

You can re-run the configuration at any time by doing:

sudo wvdialconf

Check /etc/wvdial.conf to see if it found anything for your modem. If
it did, fill out the phone number, user name, password, then try to
dial out:

sudo wvdial

Just a basic idea, maybe one you already tried.

Phil


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Miles Fidelman 09-17-2010 10:29 PM

RS232-to-USB adapter with dial-up modem
 
Phil Requirements wrote:

Here's a couple of other things I tried. I replaced
/dev/ttyS0
with
/dev/ttyUSB0
in /etc/ppp/peers/provider.


Perhaps a silly question, but does the adapter require that you install
a driver?


--
In theory, there is no difference between theory and practice.
In<fnord> practice, there is. .... Yogi Berra



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S D 09-17-2010 11:52 PM

RS232-to-USB adapter with dial-up modem
 
> From: Phil Requirements <simultaneous@comcast.net>
>
> What are you using to try to dial out?

I'm using pppd and the respective pon/poff scripts and configuration files. This configuration works fine with the modem when the modem is connected via a RS-232 port. When the modem is connected via a USB port it doesn't. The only change in the configuration appears to be the device (/dev/ttyS0
vs /dev/ttyUSB0) to which the modem is attached to.


> Perhaps a silly question, but does the adapter require that you install a driver?

There's a CD that came with the cable but it only contains stuff for Windows. The vendor did not explicitly claim it'll work with GNU/Linux. Linux does seem to recognize the modem, in the log it says "usb 1-9: ch341-uart converter now attached to ttyUSB0", so it looks like the problem isn't with the missing driver(s).

I'm beginning to think John Hasler was right when he said that "they've failed to implement enough of the modem control lines and/or gotten the voltages wrong" and suggested to throw the cable away and buy a new one. That would be a pity though.







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Greg Madden 09-18-2010 02:51 AM

RS232-to-USB adapter with dial-up modem
 
On Friday 17 September 2010 15:52:34 S D wrote:
> > From: Phil Requirements <simultaneous@comcast.net>
> >
> > What are you using to try to dial out?
>
> I'm using pppd and the respective pon/poff scripts and configuration files.
> This configuration works fine with the modem when the modem is connected
> via a RS-232 port. When the modem is connected via a USB port it doesn't.
> The only change in the configuration appears to be the device (/dev/ttyS0
> vs /dev/ttyUSB0) to which the modem is attached to.
>
> > Perhaps a silly question, but does the adapter require that you install a
> > driver?
>
> There's a CD that came with the cable but it only contains stuff for
> Windows. The vendor did not explicitly claim it'll work with GNU/Linux.
> Linux does seem to recognize the modem, in the log it says "usb 1-9:
> ch341-uart converter now attached to ttyUSB0", so it looks like the problem
> isn't with the missing driver(s).
>
> I'm beginning to think John Hasler was right when he said that "they've
> failed to implement enough of the modem control lines and/or gotten the
> voltages wrong" and suggested to throw the cable away and buy a new one.
> That would be a pity though.

I used to use a keyspan usb>rs232 adapter. It used a kernel module, which you
would see if you ran 'lsmod'. That said, it was recognised and module loaded
automagically. Which could support the 'throw it away' scenario.



--
Peace,

Greg


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Camaleón 09-18-2010 10:00 AM

RS232-to-USB adapter with dial-up modem
 
On Fri, 17 Sep 2010 13:28:52 -0700, S D wrote:

> --- On Fri, 9/17/10, Camaleón wrote:

>> Nonthing special. Well, just that you can establish a dialog with your
>> modem by sending AT commands and even place calls. And minicom is
>> perfect
>> for that :-)
>
>
(...)

> Tried minicom. Minicom doesn't seem to allow me to type any commands and
> seemingly responds only to "Ctrl A Z". Here's what I see when minicom
> starts.
>
> Welcome to minicom 2.3
>
> OPTIONS: I18n
> Compiled on Feb 24 2008, 16:35:15.
> Port /dev/ttyUSB0
>
> Press CTRL-A Z for help on special keys
>
>
> Any ideas? Thanks

Before you throw out your adapater :-), just be sure you cannot even
communicate with minicom.

It's years since I've not played with minicom, but IIRC, it required to
be properly setup before running commands ("minicom -s"). Take a look
into this manual and if you still fail to dialog with your modem, just
look for a replacement:

http://www.linux.org/docs/ldp/howto/Remote-Serial-Console-HOWTO/modem-minicom.html

Greetings,

--
Camaleón


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Miles Fidelman 09-18-2010 01:55 PM

RS232-to-USB adapter with dial-up modem
 
Camaleón wrote:

Before you throw out your adapater :-), just be sure you cannot even
communicate with minicom.

It's years since I've not played with minicom, but IIRC, it required to
be properly setup before running commands ("minicom -s"). Take a look
into this manual and if you still fail to dialog with your modem, just
look for a replacement:

I'd echo that. If you don't have your bit rate, parity, and stop bits
set right, there's a very good chance that nothing you type will get any
response. Some pieces of the chain may auto-adapt, but as long as one
step doesn't, things won't work.


Miles

--
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In<fnord> practice, there is. .... Yogi Berra



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S D 09-18-2010 05:12 PM

RS232-to-USB adapter with dial-up modem
 
--- On Sat, 9/18/10, Camaleón <noelamac@gmail.com> wrote:

> Before you throw out your adapater :-), just be sure you
> cannot even
> communicate with minicom.

I recalled that there was a way to send a command to the modem without minicom, so I tried:

# echo ATDTtest-phone-number-here > /dev/ttyUSB0

The modem does successfully dial the test number when connected through the USB adapter. The ATH command (hangup) also appears to be working:

# echo ATH > /dev/ttyUSB0

Strange, not sure why it doesn't dial out as a part of my pppd setup that works with RS-232:


## cat /etc/chatscripts/provider

# This is the chat script used to dial out to your default service provider.
# Please customize the entries enclosed in parenthesis to match your setup.
# Only the "provider" file will be handled by poff and pon (unless with
# extra command line arguments).
#
# Remember to edit /etc/ppp/peers/provider accordingly.
#
# ATZW2 as a default init string
# - On all hayes compatible modems, W2 will correctly report the connect
# speed.
#
ABORT BUSY
ABORT "NO CARRIER"
ABORT VOICE
ABORT "NO DIALTONE"
"" ATZW2

OK ATDT12345678900
ogin idhere
word passwordhere

"" ppp


## cat /etc/ppp/peers/provider

# These are the options to dial out to your default service provider.
# Please customize them correctly. Only the "provider" file will be
# handled by poff and pon (unless with extra command line arguments).

# You usually need this if there is no PAP authentication
noauth

# The chat script (be sure to edit that file, too!)
connect "/usr/sbin/chat -v -f /etc/chatscripts/provider"

# Set up routing to go through this PPP link
defaultroute

# Default modem (you better replace this with /dev/ttySx!)
/dev/ttyUSB0

# Speed
115200

# Keep modem up even if connection fails
# persist






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