LinuxQuestions.org
Download your favorite Linux distribution at LQ ISO.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Networking > Linux - Wireless Networking
User Name
Password
Linux - Wireless Networking This forum is for the discussion of wireless networking in Linux.

Notices

Reply
 
Search this Thread
Old 07-30-2007, 03:47 AM   #1
xptchina
LQ Newbie
 
Registered: Mar 2006
Posts: 8

Rep: Reputation: 0
USB GPRS modem does not dial-up


I need info how to set up USB GPRS modem.
USB GPRS modem does not work in my linux system. Modem is partly recognized, AT commands can be sent to it ( green led blinks ) but modem does not reply. Minicom will timeout waiting response from modem.

System:
ubuntu 2.6.20-16-server #2 SMP Thu Jun 7 20:26:23 UTC 2007 i686 GNU/Linux
USB GPRS modem GPRS V818G, Prolific chip inside
PC is PentiumIII with Via chipset on motherboard and USB1.1 ports.

When connecting modem to USB /var/log/messages and lsusb shows:

Code:
[ 3723.720000] usb 1-2: new full speed USB device using uhci_hcd and address 2
[ 3723.870000] usb 1-2: configuration #1 chosen from 1 choice

$ lsusb
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 002: ID 067b:0609 Prolific Technology, Inc. 
Bus 001 Device 001: ID 0000:0000
some new devices can be found in /dev

Code:
crw-rw---- 1 root root    254,   4 2007-07-30 10:13 usbdev1.2_ep00
crw-rw---- 1 root root    254,   6 2007-07-30 10:13 usbdev1.2_ep02
crw-rw---- 1 root root    254,   5 2007-07-30 10:13 usbdev1.2_ep81
crw-rw---- 1 root root    254,   7 2007-07-30 10:13 usbdev1.2_ep83
no /dev/ttyACMx or ttyUSBx devices appear


Next I modprobe command
#modprobe usbserial vendor=0x067b product=0x0609

dmesg shows:

Code:
[ 5207.390000] usbcore: registered new interface driver usbserial
[ 5207.390000] drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
[ 5207.540000] usbserial_generic 1-2:1.0: generic converter detected
[ 5207.540000] usb 1-2: generic converter now attached to ttyUSB0
[ 5207.540000] usbcore: registered new interface driver usbserial_generic
[ 5207.540000] drivers/usb/serial/usb-serial.c: USB Serial Driver core
now the modem is connected to ttyUSB0

Code:
# ls -l /dev/ttyUS*
crw-rw---- 1 root dialout 188, 0 2007-07-30 10:37 /dev/ttyUSB0
no /dev/ttyACMx appear

I can send data to modem now, green led blinks, but no reply from the modem. I tried pppd and also tried to connect directly with minicom to ttyUSB0.

I also tried modprobe cdc-acm and modprobe pl2303 but that did not help.
 
Old 07-31-2007, 03:16 PM   #2
Mara
Moderator
 
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
Posts: 9,536

Rep: Reputation: 148Reputation: 148
What happens when you connect the modem with minicom? When you type
at<enter>
You should get an echo.
 
Old 08-01-2007, 01:34 AM   #3
xptchina
LQ Newbie
 
Registered: Mar 2006
Posts: 8

Original Poster
Rep: Reputation: 0
I dont get any echo with minicom. I tried with several baud rates and changed also other settings. Modem receives data because I can see leds blinking when minicom sends data to it. I believe the chip inside is pl2303X and not pl2303.

Now I am checking if it is possible to upgrade kernel module pl2302.ko to the latest version.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solomon GPRS USB modem tw7ug Linux - Hardware 1 01-23-2008 07:52 AM
USB GPRS Modem on redhat linux chamalsl Red Hat 3 07-16-2007 09:11 PM
GPRS USB modem and Apache myrmidon Linux - Wireless Networking 3 10-01-2006 10:48 PM
SUSE 9.2 detect my [B]ADSL USB-Ethernet Modem-Router [/B] as a [B]Dial up modem[/B]. myprecius Linux - Hardware 0 06-27-2005 09:21 AM
USB GPRS modem dongle for linux? wilho Linux - Wireless Networking 0 04-12-2005 01:23 AM


All times are GMT -5. The time now is 11:28 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration