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Old 07-30-2007, 03:47 AM   #1
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Registered: Mar 2006
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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.

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:

[ 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

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:

[ 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

# 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
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
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What happens when you connect the modem with minicom? When you type
You should get an echo.
Old 08-01-2007, 01:34 AM   #3
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Registered: Mar 2006
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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.


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