Re: RS232-to-USB adapter with dial-up modem

[S D <sundimi@yahoo.com>]

--- 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